Difference between revisions of "Unix/Linux"

Latest revision as of 00:18, 6 December 2018

1 How to automatically download and process email attachments from Gmail
- 1.1 Useful references
- 1.2 Install tools
- 1.3 Configure fetchmail
- 1.4 Configure maildrop
- 1.5 uudeview
2 Use sed to repeat characters
3 Convert between lower and upper case using ansi standard
4 Use sed to delete the first line of a file or command output printing from the second line onwards
5 Use sed to munge a controlfile into submission!
6 Find all files where a certain text does not exist
7 Use tar and gzip to copy files more efficiently across network between hosts
8 double hash and double percent in shell variables to trim off characters from variables
9 The best shell script ever. An example of how scripting should be done
10 split variable (eg. filename) into separate variables using set
11 Centre align text on a line in bash shell
12 Right justify text (or repeat characters) on a line with leader dots!
13 cron jobs not submitted - daemon run out of child processes?
14 Find long-running processes with a cron job
15 Process command line arguments in shell
16 Carry XWindows settings across sessions
17 Cross-platform version of whoami
18 Set terminal title from command line
19 Remove blank lines and comments (also indented ones) from a file
20 Return elements of an array in Korn shell
21 A decent Unix Prompt
22 Simple arithmetic
23 Script encryption and passphrase protection
24 Virtual host configuration in Apache http.conf
25 Mount a website (or any other remote resource) locally using WebDav
26 Add current hostname to list of hosts on an xcat server
27 What is todays 'Day Of the Year' number?
28 Convert Julian day numbers to dates
29 Send crontab job output to a date formatted log file
30 Edit crontab file without crontab -e
31 Use shell to convert a number in scientific notation to normal
32 Check for jobs running longer that 24 hours
33 Global find and replace with perl (restricted to list of files provided by Unix find command)
34 perl function to make filenames lower case
35 From the management server, search the TNS listener port for each database on a server and make an inline substitution in the ITM config files!
36 Run a job from cron every Nth day of the month
37 ps listing does not show start time after 24 hours
38 ps -ef cuts off args cmd column on Solaris
- 38.1 To see more than 80 characters of the last column on Solaris
- 38.2 To see more than 80 characters of the last column on AIX
39 Remove blank / empty lines from vi
40 Right pad a variable
41 Connect to a Windows server from Linux using rdesktop
42 Reset your password bypassing password rules
43 Sum the sizes of all files of an ls listing
44 Mount an iso image under Linux
45 How many processors on the machine?
46 Quick, simple, understandable example of how to use RRDTool
47 Use expect to respond automatically to interactive programs
48 Use expect to allow file copy with scp (if ssh keys are not an option)
49 Within a shell script set up simultaneous output to both terminal and a file using a FIFO (named pipes)
- 49.1 More elaborate example
50 RedHat root filesystem has gone read-only
51 Kill all processes for a user
52 isRGHere
53 AIX: add a user to a group
54 Find swear words in scripts by comparing it to a list found on the internet
55 grep -p (for paragraph) works on AIX but not on Linux or Solaris
56 debug/redirect log of a shell
57 Different ways of Iteration in korn shell with a while loop
58 Filesystem 100% full, what's taking up all the space?
59 Show paged memory hogs on AIX
60 Capitalise the first letter of a word in Korn Shell
61 Remove / rename a directory / file containing weird control characters
62 Run a local script on a remote host
63 Get a list of running instances - but only those started by the current user
64 Return a list of Oracle databases running on a list of remote servers
65 Clever trick to check whether SQL output needs sending to someone
66 Check RMAN logfiles for errors from cron every day
67 An alternative to getopts
68 Run a script on multiple servers
69 How can a shell script find out what directory it is in?
70 Array processing
71 Send an email by talking directly to an smtp server
72 Send an email by talking directly to an smtp server via file descriptor (no telnet! this time), adding authentication
73 rsync examples
74 Handy aliases
75 How to configure SSH with public/private keys
76 Use SSH config file
77 A decent sed tutorial
78 A decent korn/bash shell tutorial
79 trap
80 DNS not working
81 File descriptors
82 Create new image with kvm
83 rpm / yum commands
- 83.1 Install an RPM Package
- 83.2 Check dependencies of RPM Package before Installing
- 83.3 Install RPM Package with all dependencies
- 83.4 Install RPM Package with all dependencies (when RPM has been downloaded to local machine)
- 83.5 Force Install a RPM Package without dependencies
- 83.6 Check an Installed RPM Package
- 83.7 List all files of an installed RPM package
- 83.8 List All Installed RPM Packages
- 83.9 Query information about an installed RPM package
- 83.10 Query information about a not yet installed RPM package
- 83.11 (Forcibly) Remove an RPM Package
- 83.12 Query a file that was installed as part of an RPM Package (which package contained this file)
- 83.13 Verify an RPM package
- 83.14 Rebuild corrupted RPM database
84 Install rpmforge repository
85 Install rpmfusion repository
86 config file for yum
87 Setup Oracle Enterprise Linux (RedHat) with yum server
88 To change to static IP address (Raspberry Pi)
89 Troubleshoot wireless network problems
90 To change to static IP address (Redhat/CentOS)
91 Enable processes / services to start at boot time
92 Run a command on lots of servers in parallel
93 Download a gzip file and pipe it into tar
94 Check in a script to make sure it is run only by root
95 Set terminal to use Backspace key to erase previous character instead of Control-H
96 Play with the terminal settings and reset them again either side of requesting a password
97 Reset terminal to "sane" characteristics
98 Install OpenOffice on RedHat Enterprise when yum install doesn't!
99 What does this do?
100 List of Special Characters and what they mean

How to automatically download and process email attachments from Gmail[edit]

Useful references[edit]

Eventually, after months of trying different things, came up with this combination of tools that worked very well.

Install tools[edit]

sudo dnf -y install fetchmail maildrop uudeview openssl

Set Gmail account up for POP and disable IMAP

Configure fetchmail[edit]

This is the part that talks to Gmail and downloads the emails to the local machine.

vi ~/.fetchmailrc

set postmaster "<username>"
#set daemon 600
poll pop.gmail.com with proto POP3
    user "[email protected]" there with password '<password>' is <username> here options ssl nokeep
    mda "/usr/bin/maildrop .mailfilter"
#    sslcertfile /etc/ssl/certs/ca-bundle.crt

If fetchmail complains about ssl certificates, try specifying wherein is with the sslcertfile line

Configure maildrop[edit]

maildirmake maildrop
maildirmake backup

vi ~/.mailfilter

LOGFILE = "/home/dbahawk/maildrop/maildrop.log"
DEFAULT="$HOME/maildrop"

# keep a copy
cc backup
`cd backup/new && rm -f dummy \`ls -t | sed -e 1,50d\``

if (/^To:.*getmail@...\.dnsalias\.org$/)
   {
        to Maildir/getmail/
   }

#if (/^To:.*dbahawk/)
#   {
#        to maildrop
#   }

if (/^To:.*dbahawk/)
    dotlock "auto.lock" {
    to "|uudeview -c -i"
}

Not really sure why this filter is not working properly. The cc works but the To: check doesn't. So I have a shell that runs separately to process the emails in the backup mail directory.

uudeview[edit]

This is a clever program that can extract attachments from emails and put them in a directory of you choosing.
This shell runs from cron at regular intervals to run the whole process

#!/usr/bin/ksh

# fetch any new mail from Gmail (uses .fetchmailrc)
# fetchmail log is $HOME/maildrop/maildrop.log
fetchmail -d0

# fetchmail uses maildrop as mda (uses .mailfilter) to save messages to a maildir.
# this is not working correctly but still copies the messages to backup

# pull out the attachments and send them to the incoming directory for the collector to process when it wakes up
uudeview -c -i -p ~/Downloads/dbahawk_forward backup/new/*

Use sed to repeat characters[edit]

echo an '=' sign then use the loop feature of sed to run round a loop a further 79 times replacing what you've got with the same thing plus and extra one!

echo "=" | sed -e :a -e 's/^=\{1,79\}$/&=/;ta'

Convert between lower and upper case using ansi standard[edit]

This way should be portable and give predictable results

LOWER_SID=$(echo "${SID}" | tr '[:upper:]' '[:lower:]')
UPPER_SID=$(echo "${SID}" | tr '[:lower:]' '[:upper:]')

Use sed to delete the first line of a file or command output printing from the second line onwards[edit]

Actually deceptively simple. Example remove the header from df output.

df -k | sed 1d

or more formally

df -k | sed -e '1,1d'

As a useful extension, suppose TO_DATA_DIR contains multiple directories, this will total the free space for all relevant filesystems
This one is specific to AIX, for other Unixes and Linux, use $4 instead of $3.

SPACE_AVAILABLE=$(df -k $TO_DATA_DIR | sed 1d | awk 'BEGIN {i=0} {i=i+$3} END {print i}')

Use sed to munge a controlfile into submission![edit]

delete comment lines
delete all lines after the one starting with a semicolon
delete all blank lines
change reuse to set
change archivelog (with word boundaries) to noarchivelog
change old sid to new sid

sqlplus -s / as sysdba<<'EOSQL' >/dev/null
alter database backup controlfile to trace as '/tmp/regenerate_controlfile.sql' reuse resetlogs;
EOSQL
OLDSID='PROD'
NEWSID='TEST'
sed  -e '/^--/d' -e '/^\;/q' -e '/^ *$/d' -e 's/REUSE/SET/' -e 's/\<ARCHIVELOG\>/NOARCHIVELOG/' -e 's/\"'${OLDSID}'\"/\"'${NEWSID}'\"/' /tmp/regenerate_controlfile.sql

Find all files where a certain text does not exist[edit]

Mostly we want to search for files containing a particular string but how to find those files that do not contain some text.
Using xargs instead of -exec forces the filename to be printed. -H should do this but doesn't seem to in this case.

find . -name "*cfg" | xargs grep -H -c TO_CV_HOST {} \; | grep ':0$' | cut -d: -f1

Use tar and gzip to copy files more efficiently across network between hosts[edit]

From the destination server, this will connect to the source, tar up each file and pull it back to the current server

ssh oracle@hn5211 "cd /oracle/ora_data4/iten3/ && tar -cf - . | gzip " | ( cd /oracle/ora_data2/iten/ && gunzip -c | tar -xvf - . )

double hash and double percent in shell variables to trim off characters from variables[edit]

# - trims everything from the start of line till the FIRST occurrence of following character (abstemious) :-)
## - trims everything from the start of line till the LAST occurrence of following character (greedy)
% - trims everything from the end of line backwards till the FIRST occurrence of following character (abstemious)
%% - trims everything from the end of line backwards till the LAST occurrence of following character (greedy)

FILENAME="/home/bey9at77/hello.txt"
FILE_STUB1=${FILENAME##*/}
FILE_STUB=${FILE_STUB1%.*}
echo $FILE_STUB
hello
FILE_EXT=${FILENAME##*.}
echo $FILE_EXT
txt

or
# - remove prefix reluctantly
## - remove prefix greedily
% - remove suffix reluctantly
%% - remove suffix greedily

words="do.re.mi"

echo ${words#*.}

echo ${words##*.}

echo ${words%.*}

echo ${words%%.*}

The best shell script ever. An example of how scripting should be done[edit]

It was written by someone at Oracle. Unfortunately (s)he did not put any author comment in it. Also unfortunately I cannot show it here as it is protected behind Oracles support website.
If you have an Oracle Metalink id, you can get the complete script here
Here is a snippet of a function that demonstrates proper commenting and a very good style.
The script is called physru.sh and upgrades an Oracle database in a rolling upgrade fashion by using a physical standby.
There are 4500 lines in the full script but it is so easy to read and understand because of the way it's written, it's like a breath of fresh air. Well done whoever you are!

###############################################################################
# NAME:        wait_mrp_active
#
# DESCRIPTION: 
#   Wait for $MRP_START_TIMEOUT minutes to confirm that the MRP is active.  If
#   we can't detect an active MRP, abort the script with an error.
#
# INPUT(S):
#   Arguments:
#     $1: database user
#     $2: user password
#     $3: tns service name
#     $4: database unique name
#
#   Globals:
#     None
#
# RETURN:
#   None
#
###############################################################################
wait_mrp_active()
{
  display "confirming media recovery is running"
  l_wma_status=1
  l_wma_curtime=`perl -e 'print int(time)'`
  l_wma_exptime=`expr $MRP_START_TIMEOUT "*" 60`
  l_wma_maxtime=`expr $l_wma_curtime + $l_wma_exptime`
  while [ "$l_wma_curtime" -lt "$l_wma_maxtime" ]
  do
    is_mrp_running $1 $2 $3 $4
    if [ "$?" -gt "0" ]; then
      l_wma_status=0
      break
    fi

    sleep $MRP_START_INTERVAL
    l_wma_curtime=`perl -e 'print int(time)'`
  done
  chkerr $l_wma_status "could not detect an active MRP after $MRP_START_TIMEOUT minutes"
}

split variable (eg. filename) into separate variables using set[edit]

FILENAME="split_this_into_bits"
set $(echo ${FILENAME} | sed 's/_/ /g')
echo $4 $3 $2 $1
bits into this split

Centre align text on a line in bash shell[edit]

Doesn't work in Korn shell due to %*s

#COLUMNS=$(tput cols)   # width of the current window
COLUMNS=80
title="Hello world!"
printf "%*s\n" $(((${#title}+$COLUMNS)/2)) "$title"

and as a one-liner

printf "%*s\n" $(( ( $(echo $* | wc -c ) + 80 ) / 2 )) "$*"

This works in Korn shell...

TITLE="$1"
LINEWIDTH=80

LPAD=$(((${#TITLE}+$LINEWIDTH)/2))
printf %${LPAD}s "$TITLE"

Right justify text (or repeat characters) on a line with leader dots![edit]

function rpadwait {
    text=$1
# -------------------------
# suppress newline for echo
# -------------------------
N=
C=
if echo "\c" | grep c >/dev/null 2>&1; then
    N='-n'
else
    C='\c'
fi


    echo ${N} "${text}${C}" | sed -e :a -e 's/^.\{1,80\}$/&\./;ta'
}

cron jobs not submitted - daemon run out of child processes?[edit]

Sometimes have problems with NFS mounts and this causes cron jobs to hang. If they are scheduled to run regularly, eventually cron will no longer be able to start any more jobs.

Check the cron log /var/adm/cron/log to see if there are any errors or other messages around the time the jobs should run.

If cron has hit its process limit (default 100), it will try again after a number of seconds (default 60).
Both the number of jobs and wait time are configured in the file /var/adm/cron/queuedefs. If it is unusual for cron to be running so many jobs, you can check the process table to view the jobs cron has created. These jobs will have parent process id (PPID) of the cron daemon.

$ ps -ef | grep cron | grep -v grep
    root  6750314        1   0   Apr 24      -  3:39 /usr/sbin/cron
solax025:root[/home/root]# ps -T 6750314
      PID    TTY  TIME CMD
  6750314      -  3:39 cron
 21168296      -  0:00     \--bsh
 58982414      -  0:00         \--sadc

In this example, we only have 1 job running

Find long-running processes with a cron job[edit]

Processes running longer than 24 hours have a date instead of a start time...

58 08,14 * * * /home/ibmtools/scripts/oracle/dosh -vc "ps -ef|grep 'ibmtools/scripts/oracle'|perl -nae 'print if \$F[4] !~/:/'" >/tmp/lrp.txt; [[ $(grep -c ibmtools /tmp/lrp.txt) -ne 0 ]] && cat /tmp/lrp.txt|mailx -s '*** long running processes - please check ***' [email protected]

Process command line arguments in shell[edit]

Borrowed from Mozilla Firefox installer

## Command line arg defaults
##
moz_debug=0
moz_debugger=""
moz_debugger_args=""
#
##
## Parse the command line
##
while [ $# -gt 0 ]
do
  case $1 in
    -g | --debug)
      moz_debug=1
      shift
      ;;
    -d | --debugger)
      moz_debugger=$2;
      if [ "${moz_debugger}" != "" ]; then
	shift 2
      else
        echo "-d requires an argument"
        exit 1
      fi
      ;;
    -a | --debugger-args)
      moz_debugger_args=$2;
      if [ "${moz_debugger_args}" != "" ]; then
	shift 2
      else
        echo "-a requires an argument"
        exit 1
      fi
      ;;
    *)
      break;
      ;;
  esac
done
#
##
## Program name given in $1
##
if [ $# -gt 0 ]
then
	MOZ_PROGRAM=$1
	shift
fi
##
## Program not given, try to guess a default
##
if [ -z "$MOZ_PROGRAM" ]
then
	##
	## Try this script's name with '-bin' appended
	##
	if [ -x "$MOZ_DEFAULT_NAME" ]
	then
		MOZ_PROGRAM=$MOZ_DEFAULT_NAME
	##
	## Try mozilla-bin
	## 
	elif [ -x "$MOZ_APPRUNNER_NAME" ]
	then
		MOZ_PROGRAM=$MOZ_APPRUNNER_NAME
	fi
fi
#
#
##
## Make sure the program is executable
##
if [ ! -x "$MOZ_PROGRAM" ]
then
	moz_bail "Cannot execute $MOZ_PROGRAM."
fi
#

Carry XWindows settings across sessions[edit]

# ----------------------
# push XWindows settings
# ----------------------
[[ "$(uname)" == "SunOS" ]] && PATH=/usr/openwin/bin:$PATH
WHOAMI=$(id | awk -F')' '{print $1}' | awk -F'(' '{print $2}')
xauth list > /tmp/xauth_list_$WHOAMI
chmod 777 /tmp/xauth_list_$WHOAMI

echo $DISPLAY > /tmp/xdisplay_$WHOAMI
chmod 777 /tmp/xdisplay_$WHOAMI

Cross-platform version of whoami[edit]

WHOAMI=$(id | awk -F')' '{print $1}' | awk -F'(' '{print $2}')

Set terminal title from command line[edit]

Put something like this in the .profile
-n do not output the trailing newline
-e enable interpretation of backslash escapes
|0 sets title of window and icon
|1 sets title of icon only
|2 sets title of window only

echo -en "\033]0;`hostname`\007"

echo -en "\033]2;`hostname`\007"

Remove blank lines and comments (also indented ones) from a file[edit]

awk -F\: '!/^($|[:space:]*#)/ {print $2}' /etc/oratab | sort | uniq

or as part of a script that removes comments and blank lines from all Korn shell scripts in a directory

#!/usr/bin/ksh
for i in $(ls *ksh); do
    perl -p -i -e 's/^\s*#[^!]*$//; s/^\s*$//' $i
done

Return elements of an array in Korn shell[edit]

From here
Could be used to separate the columns of an SQL select when returning to the shell
This approach eliminates the need to put quotes around text with spaces in it.

echo $KSH_VERSION
x="Red,Yellow is a color,Blue"
oIFS=$IFS
IFS=,
y=($x)
IFS=$oIFS
echo ${y[1]}

A decent Unix Prompt[edit]

export PS1="`uname -n`:`whoami`[\${PWD}]# "
or
export PS1='($?) $'ORACLE_SID" "`whoami`"@"`uname -n`":"'$'PWD"> "
export EDITOR=vi

Simple arithmetic[edit]

pipe the calculation into the shell calculator

space_in_kb=$(echo $1 / 1024 | bc)

Calculate the remainder (modulo) of a division calculation

if [[ $(echo "${NUMBER} % 2" | bc) -eq 0 ]]; then
    echo "${NUMBER} is even"
else
    echo "${NUMBER} is odd"
fi

or do it in awk if scientific notation maybe involved

function calc { awk "BEGIN{print $*}"; }

if [[ $(calc "${SPACE_USED} + ${SPACE_AVAILABLE} - ${DATABASE_SIZE") -le 0 ]]; then
    echo "NOK"
fi

Script encryption and passphrase protection[edit]

Encrypt a shell script with the ability to execute the encrypted version

from commandlinefu.com

scrypt(){ [ -n "$1" ]&&{ echo '. <(echo "$(tail -n+2 $0|base64 -d|mcrypt -dq)"); exit;'>$1.scrypt;cat $1|mcrypt|base64 >>$1.scrypt;chmod +x $1.scrypt;};}

Virtual host configuration in Apache http.conf[edit]

<VirtualHost *:80>
        ServerName dbamon
        DocumentRoot "/Volumes/data/Sites/dbamon_push"
        <Directory "/Volumes/data/Sites/dbamon_push">
                Options Includes FollowSymLinks
                AllowOverride All
                Order allow,deny
                Allow from all
        </Directory>
</VirtualHost>

and in /etc/hosts, add...

127.0.0.1  dbamon

Mount a website (or any other remote resource) locally using WebDav[edit]

Redhat/CentOS

yum install fuse-davfs2
or
yum install wdfs.x86_64

Debian

apt-get install davfs2

then...

sudo mkdir /mnt/webdav  # or whatever you'd like to call the directory
sudo mount.davfs [-o option[,option]...] device mount_point

In man's terms, that last line would translate to:

id  #suppose this returns uid=501 and gid=502
sudo mount.davfs -o 501,502 https://your/web/site /mnt/webdav

Mac OSX

osascript -e ' mount volume "http://username:[email protected]:portnum" '
or
osascript -e ' mount volume "http://[email protected]:portnum" '
or
osascript -e ' try mount volume "http://webdav.address:portnum" '
or
mount -t webdav http://webdav.address:portnum /mnt/webdav  # this one won't show up in the Finder Sidebar.

Add current hostname to list of hosts on an xcat server[edit]

CMD="nodels"
HOST=`hostname`
(echo "$HOST"; $CMD) | while read server
do
    echo "server:$server"
done

What is todays 'Day Of the Year' number?[edit]

DOY=`perl -e 'print sub{$_[7]}->(localtime)+1;'`

Convert Julian day numbers to dates[edit]

for day in 8 33 36 61 64 91 96 121 126 152 155 182 187 215 218 244 247 274 279 306 309 335 338 365; do date -d "`date +%Y`-01-01 +$(( ${day} - 1 ))days" +%d-%m-%Y; done

Send crontab job output to a date formatted log file[edit]

This will run a job every 5 minutes and send the output to a file ending with a time in hours and minutes.
The thing to note is the escaped percent signs. This is because a % sign is interpreted by cron to mean a newline character. Everything after the first % is treated as input to the program.

*/5 *  * * * /var/www/cgi-bin/dbamon_collector.ksh       >/tmp/dbamon_collector.log.$(date "+\%H\%M") 2>&1

Edit crontab file without crontab -e[edit]

It can happen that you need to add or modify a line in the crontab of many users or across many servers at once.
In principle, there's nothing wrong with modifying the crontab file directly. You just lose the advantages of file locking (and syntax checking) that crontab -e offers.
Here we take a backup of the current crontab, print it out, echo an extra command and ask cron to use these as input (thus overwriting the existing crontab file). Just don't run this close to midnight :-)

crontab -l > /tmp/crontab.`date '+%Y%m%d'`
(
cat /tmp/crontab.`date +'%Y%m%d'`
echo "02 10 * * * /home/ibmtools/scripts/oracle/export_parfile.ksh -s SID -f JDBEOP1.parfile"
) | crontab -

or

crontab -l > /tmp/crontab.backup
crontab -l > /tmp/crontab.$$
perl -p -i -e 's!backup_send_tsm_dump!backup_export2tsm!g' /tmp/crontab.$$
crontab /tmp/crontab.$$
rm /tmp/crontab.$$

or

crontab -l >$HOME/crontab.$(date '+%Y%m%d')
crontab -l | perl -p -e 's|/nas/software/oracle/scripts|/oracle/scripts|' | crontab

Use shell to convert a number in scientific notation to normal[edit]

var2convert='1.2345678e3'
printf -v var2convert "%.f" $var2convert
echo $var2convert  # magic!

Check for jobs running longer that 24 hours[edit]

Run from the management server across all Unix servers. Checks the 5th column in a ps listing. If it doesn't find a : (time separator), the process is running longer than 24 hours.

# ---------------------------------------
# report on long running oraibm processes
# ---------------------------------------
01 17,14 * * * rm -f /tmp/lrp.txt;/home/ibmtools/scripts/oracle/dosh -vc \"ps -ef|egrep 'oraibm|scripts/oracle'>/tmp/lrp.txt;perl -nae 'print if \$F[4] !~/:/' /tmp/lrp.txt\" >>/tmp/lrp.txt;[[ $(egrep -c 'oraibm|scripts/or
acle' /tmp/lrp.txt) -ne 0 ]] && cat /tmp/lrp.txt|mailx -s '*** long running processes - please check ***' [email protected]

Global find and replace with perl (restricted to list of files provided by Unix find command)[edit]

find . -type f -exec perl -i -pe 's/something/else/g' {} \;

perl function to make filenames lower case[edit]

function lower { 
   perl -e 'for (@ARGV) { rename $_, lc($_) unless -e lc($_); }' * 
}

From the management server, search the TNS listener port for each database on a server and make an inline substitution in the ITM config files![edit]

for i in `/home/ibmtools/scripts/oracle/dosh -c "ls -al /opt/IBM/ITM/config/*rz*cfg|grep -v lrwx"|awk '{print $NF}'`; do
    server=`echo $i|cut -d_ -f1 | awk -F'/' '{print $NF}'`
    db=`echo $i|cut -d'.' -f1 | awk -F'_' '{print $NF}'`
    OH=`ssh $server grep "^$db" /etc/oratab|cut -d: -f2`
    LISTENERPORT=`ssh $server cat $OH/network/admin/listener.ora|perl -00 -ne 'print $1 if /'$db'.*PORT.*=.*(\d{4})/s'`
    ssh $server perl -p -i.bak -e 's/1521/'$LISTENERPORT'/' $i
    ssh $server ls -al ${i}*
done

Run a job from cron every Nth day of the month[edit]

Example. Execute a job every third Saturday of the month.
Paste this into a file called calenday and put it in /usr/local/bin so it's (probably) on the PATH

#!/usr/bin/ksh

# ix is the week number of the month ("2"nd Friday of the month, "3"rd Tuesday of the month)
# dy is the day number in Unix format (0 for Sunday, 1 for Monday, ... 6 for Saturday)
# eg. "calenday 3 6" returns the date of 3rd Saturday of the month.

ix=$1
dy=$2
SCHAR=$((($dy*2)+$dy+1))
ECHAR=$(($SCHAR+1))
cal `date '+%m %Y'` | egrep "\<[0-9]{1,2}\>" | cut -c${SCHAR}-${ECHAR} | xargs | awk {'print $'$ix'}'

Now in crontab, you should be able to do something like this:

15 20 * * * [[ `calenday 3 6` -eq `/bin/date '+%d'` ]] && su - oracle -c "run_my_backup.ksh"

This will also work on some Unices..
We send backups to a special TSM node on the second Friday of each month. This report must run a day later - but that is not guaranteed to be the second Saturday or even the 3rd. So...

30 12 8-14 * 5 sleep 86400 && su - oracle -c "/usr/bin/perl -ne 'print if /ORX_M_SOL/ .. /^STOP/' /home/oracle/incoming/dbamon_spool_tsm_*.SOL | grep Archive | grep -v Client | mailx -s 'Monthly TSM backups' [email protected]"

ps listing does not show start time after 24 hours[edit]

But you can see elapsed time using your own ps command

/usr/bin/ps -eo etime,user,pid,ppid,cpu,start,tty,time,args|tail -n +2|sort

ps -ef cuts off args cmd column on Solaris[edit]

To see more than 80 characters of the last column on Solaris[edit]

This shows all the individual arguments to the command

pargs <pid>

This shows the ps listing in 'compatibility' mode (there are more compatibility commands in /usr/xpg4/bin)

/usr/ucb/ps auww

To see more than 80 characters of the last column on AIX[edit]

This shows the full argument listing of a process (NOTE: no minus sign!)

ps eww <pid>

Remove blank / empty lines from vi[edit]

Maybe you cut and pasted a file from Windows and it's full of blank lines and Control-M's now
There are several methods but I think this is the easiest to remember

:g/^$/d

Right pad a variable[edit]

a function like rpad in SQL but for Shell

function rpad {
text=$1
padwidth=$2
padchar=$3
echo "$text" | sed -e :a -e 's/^.\{1,'$padwidth'\}$/&\'$padchar'/;ta'
}

Connect to a Windows server from Linux using rdesktop[edit]

My remmina stopped working so rolled my own. Very simple really. Put this is a shell.

tsocks rdesktop -z -P -x m -a 16 -d MAIND -u sbarkley -p ****** -r disk:SOL=$HOME/Documents/SOL -g 95% 150.251.112.38 &

where...
-z    - enables compression
-P    - enables bitmap caching (saves network traffic)
-x m  - disables eye-candy features
-a 16 - reduce colour pallete to 16 colours
-d    - domain to connect to
-u    - username
-p    - password
-r    - setup a shared folder
-g    - geometry (use W x H or percentage)

Slight problems with rdesktop not working 100% of the time. Now using xfreerdp. Seems better...

xfreerdp -g 90% --ignore-certificate --gdi sw -K -d wdcrhbp05 -u oraibm -p "`cat $HOME/scripts/.oraibm.password`" -T "wdcrhbp05_oraibm" --plugin cliprdr --plugin rdpdr --data disk:SOL:/home/bey9at77/Documents/SOL -- --plugin rdpsnd --data alsa -- 150.251.112.25 &

Reset your password bypassing password rules[edit]

must be done as root

echo "user:new_password" | chpasswd

Sum the sizes of all files of an ls listing[edit]

It'll check to see if the sum of filesizes corresponds with the df -g (or h) listing (can get messed up due to open but deleted files)

cd /oracle/export
df -g .
find . -name "*dmp*" -ls |  awk '{ SUM += $7} END { print SUM/1024/1024/1024 }'

Mount an iso image under Linux[edit]

mkdir -p /mnt/cdrom
mount -o loop /dev/cdrom /mnt/cdrom

How many processors on the machine?[edit]

AIX

lsdev -C|grep Process|wc -l

Solaris

psrinfo -v|grep "Status of processor"|wc -l

Linux

cat /proc/cpuinfo|grep processor|wc -l

Quick, simple, understandable example of how to use RRDTool[edit]

RRDTool

Use expect to respond automatically to interactive programs[edit]

#!/usr/bin/expect -f
spawn /usr/tivoli/tsm/client/oracle/bin64/tdpoconf passw -tdpo_optfile=/oracle/[lindex $argv 0]/admin/tdpo.opt
expect "assword:" {send "password\r"}
expect "assword:" {send "password\r"}
expect "assword:" {send "password\r"}

Use expect to allow file copy with scp (if ssh keys are not an option)[edit]

#!/usr/bin/expect -f
spawn scp /home/oracle/.profile oracle@hn512:/tmp/prfl
set pass "thepassword"
expect {
        password: {send "$pass\r" ; exp_continue}
        eof exit
}

Within a shell script set up simultaneous output to both terminal and a file using a FIFO (named pipes)[edit]

or "How to send shell output to screen/stdout as well as to a logfile using tee and redirection with exec"

examples here on unix.com

general info on redirections here at catonmat.net

#!/bin/ksh

REDIR=test.redir
FIFO=test.pipe
[[ -e $FIFO ]] || mkfifo $FIFO

# make a new channel(3) and copy channel 1's destination as its own (does NOT POINT TO channel 1's destination)
# this allows the normal output to continue to STDOUT but also get printed to whatever file is attached to channel 3
exec 3>&1

# anything coming in on the pipe, send it to $REDIR and to channel 3
tee $REDIR <$FIFO >&3 &

# redirect STDOUT to the pipe
exec > $FIFO

echo "going to default output"
echo "forcing to channel 1" >&1
echo "forcing to channel 2" >&2
echo "forcing to channel 3" >&3

More elaborate example[edit]

found here on stackoverflow

#!/bin/sh

# Author: Harvey Chapman <hchapman _AT_ 3gfp.com>
# Description: POSIX shell functions that can be used with tee to simultaneously put
#              stderr and stdout to both a file and stdout
#
# Based on:
#    Re: How to redirect stderr and stdout to a file plus display at the same time
#    http://www.travishartwell.net/blog/2006/08/19_2220

#
# Original example function from Travis Hartwell's blog.
# Note: I've made minor changes to it.
example()
{
  OUTPUT_LOG=output.log
  OUTPUT_PIPE=output.pipe

  # This should really be -p to test that it's a pipe.
  if [ ! -e $OUTPUT_PIPE ]; then
      mkfifo $OUTPUT_PIPE
  fi

  # This should really be -f to test that it's a regular file.
  if [ -e $OUTPUT_LOG ]; then
      rm $OUTPUT_LOG
  fi

  exec 3>&1 4>&2
  tee $OUTPUT_LOG < $OUTPUT_PIPE >&3 &
  tpid=$!
  exec > $OUTPUT_PIPE 2>&1

  echo "This is on standard out"
  echo "This is on standard err" >&2

  exec 1>&3 3>&- 2>&4 4>&-
  wait $tpid

  rm $OUTPUT_PIPE
}

# A slightly reduced version of example()
example2()
{
  OUTPUT_LOG=output.log
  OUTPUT_PIPE=output.pipe

  rm -f $OUTPUT_PIPE
  mkfifo $OUTPUT_PIPE
  rm -f $OUTPUT_LOG

  tee $OUTPUT_LOG < $OUTPUT_PIPE &
  tpid=$!

  exec 3>&1 4>&2 >$OUTPUT_PIPE 2>&1

  echo "This is on standard out"
  echo "This is on standard err" >&2

  exec 1>&3 3>&- 2>&4 4>&-
  wait $tpid
  rm -f $OUTPUT_PIPE
}

#
# Logging methods based on above. See the example below for how to use them.
#

# Usage: start_logging [delete_existing_logfile]
start_logging()
{
  # Check to see if OUTPUT_LOG and OUTPUT_PIPE need to be defined.
  if [ -z "$OUTPUT_LOG" ]; then
    OUTPUT_LOG=output.log
  fi
  if [ -z "$OUTPUT_PIPE" ]; then
    OUTPUT_PIPE=output.pipe
  fi
  # Make sure that we're not already logging.
  if [ -n "$OUTPUT_PID" ]; then
    echo "Logging already started!"
    return 1
  fi

  # Always remove the log and pipe first.
  rm -f $OUTPUT_PIPE
  # Delete the logfile first if told to.
  if [ "$1" = delete_existing_logfile ]; then
    rm -f $OUTPUT_LOG
  fi

  mkfifo $OUTPUT_PIPE
  tee -a $OUTPUT_LOG < $OUTPUT_PIPE &
  OUTPUT_PID=$!

  exec 3>&1 4>&2 >$OUTPUT_PIPE 2>&1
}

stop_logging()
{
  # Make sure that we're currently logging.
  if [ -z "$OUTPUT_PID" ]; then
    echo "Logging not yet started!"
    return 1
  fi
  exec 1>&3 3>&- 2>&4 4>&-
  wait $OUTPUT_PID
  rm -f $OUTPUT_PIPE
  unset OUTPUT_PID
}

example3()
{
  start_logging
  #start_logging delete_existing_logfile
  echo "This is on standard out"
  echo "This is on standard err" >&2
  stop_logging
}

RedHat root filesystem has gone read-only[edit]

How to fix read only root file system

Kill all processes for a user[edit]

for prc in `ps -ef | grep -E "^ +[o]racle" | awk '{print $2}'`; do
    kill $prc
done

isRGHere[edit]

Checks if resource group is on this leg of an HACMP cluster. Returns 0 if true else 1.

#!/usr/bin/ksh

SCRIPT=`basename $0`

function rctest
{
exitcode=$1
msg=$2
if [ $exitcode -ne 0 ]; then
        echo "********************************************************************************"
        echo "\nScript $SCRIPT finished with errors."
        echo "$msg."
        echo "Returncode : $exitcode."
        echo "\n********************************************************************************"

        fi
exit $exitcode

}

RGINFO=/usr/es/sbin/cluster/utilities/clRGinfo
[[ ! -f $RGINFO ]] &&  rctest 1 "clRGinfo not found"

if [ $# -eq 1 ]
then
        RG=`echo $1 | cut -c 1-14`
else
        rctest 10  "Usage: `basename $0` <RG name>"
fi

$RGINFO |grep -qwp $RG ||  rctest 9 "$RG is not defined"

THISNODE=`/usr/es/sbin/cluster/utilities/get_local_nodename | cut -c 1-14`
$RGINFO |grep -wp $RG |grep -w $THISNODE |grep -wq ONLINE

AIX: add a user to a group[edit]

chgrpmem -m + oracle ibmtls

Find swear words in scripts by comparing it to a list found on the internet[edit]

wget "http://www.bannedwordlist.com/lists/swearWords.csv" -O /tmp/s ; for word in $(cat /tmp/s | sed -e 's/ /_/g' -e 's/,/ /g') ; do grep -wR $word *; done | less

grep -p (for paragraph) works on AIX but not on Linux or Solaris[edit]

Use awk instead

awk 'BEGIN {FS="\n" RS="\n\n"} /search pattern/ { do something }' <file>
/usr/xpg4/bin/awk 'BEGIN {RS="\n\n";FS="\n"} /AGRHDWQ1/ {print $2}' dsm.sys | awk '{print $NF}'

this prints the last word of the second line in the paragraph in dsm.sys that contains the search term AGRHDWQ1.
Or slightly simpler...

awk -v RS='' '/NHAPPLP1/' /etc/tsm/dsm.sys     # (use /usr/xpg4/bin/awk on Solaris)

or, case insensitively:

awk -v RS='' 'tolower($0) ~/so_u_clubqa_orx_d_cab/' /etc/tsm/dsm.sys

Using -v means you don't have to use a BEGIN section.

debug/redirect log of a shell[edit]

#!/usr/bin/ksh
exec 2>/tmp/mytest

Different ways of Iteration in korn shell with a while loop[edit]

IFS="|"
exec 0<$statfile
while read host db started stopped
do
    rrdfile="export_duration_${host}_${db}.rrd"
    $RRDTOOL update ${RRDDIR}/${rrdfile} $started:$started $stopped
done

or

while read host db started stopped
do
    rrdfile="export_duration_${host}_${db}.rrd"
    $RRDTOOL update ${RRDDIR}/${rrdfile} $started:$started $stopped
done <statfile

or

    cat $statfile | sort -nk4 | while IFS=\| read host db type started stopped
    do
        [[ "$stopped" == "" ]] && continue
        rrdfile="export_duration_${host}_${db}.rrd"
        $RRDTOOL update ${RRDDIR}/${rrdfile} ${started}:${started}:${stopped}
        [[ $? -ne 0 ]] && echo "nok: $?"
    done

Filesystem 100% full, what's taking up all the space?[edit]

find /oracle/endur -xdev -ls|sort -nr +6|head

or

/dev/esb01fs010001      1.00      0.00  100%     1838    69% /oracle
beuxdsysesb01:root[/root]# cd /oracle
beuxdsysesb01:root[/oracle]# du -gsx * | sort -n
0.00    checkpoints
0.00    flash_recovery_area
0.00    lost+found
0.00    oraInst.loc
0.00    oraInventory
0.09    admin
0.99    diag

cd diag and repeat until culprits are found

Show paged memory hogs on AIX[edit]

svmon -Pt20 | perl -e 'while(<>){print if($.==2||$&&&!$s++);$.=0 if(/^-+$/)}'

Capitalise the first letter of a word in Korn Shell[edit]

Not as easy as it sounds if it needs to work in non-ksh93 shells

function capit { 
    typeset -u first
    first=${1%"${1#?}"}
    printf "%s\n" "${first}${1#?}"
    return 0
}

or maybe more neatly done in Perl...
This will capitalise each word in a sentence passed into it

function capit { 
    echo "$1" |  perl -pe "s/([\w']+)/\u\L\1/g"
    return 0
}

Remove / rename a directory / file containing weird control characters[edit]

Use ls with -i to see inode listing

ls -bali

Use find with -inum to get the filename and -exec to remove it

find . -inum <inode from ls listing> -exec rm -f {} \;

Run a local script on a remote host[edit]

Doing it this way means we do not need to scp the shell over to the host before executing it!

ssh user@host 'sh' < your_script.sh

First of all, this command is a redirection: your shell will open the file your_script.sh and feed it as input to the ssh command. ssh, in turn, will tunnel its stdin to the remote command, namely, sh instance. And sh without arguments reads its script from stdin. So we got sh instance, which is launched on remote host, but reads commands from your local file.

Get a list of running instances - but only those started by the current user[edit]

This is the way I wanted to do it but there's an issue. Where does that spare } character come from? Anyone?

ps -ef | grep [p]mon | awk -v dbowner=$(id -un) '{ if ($1==dbowner) { gsub(/ora_pmon_/,"",$NF); print $NF; } }'

ps listing

$ ps -ef | grep [p]mon
  oracle 13304024        1   0   Jun 07      -  2:39 ora_pmon_reportk
  oracle 26018178        1   0   Jun 07      -  3:01 ora_pmon_dwh_perf
  oracle 29229432        1   0   Jun 07      -  2:30 ora_pmon_adso
 oraebso 18022994        1   0   Jun 07      -  2:38 ora_pmon_EBSO
  oracle 30278192        1   0   Jun 07      -  2:48 ora_pmon_owb112k

Results of above command

reportk
dwh_perf
adso
}
owb112k

Workaround 1. Send the ps listing to a file and work on it without pipes. Works but it's a bit long-winded especially as we have to clean up afterwards.

ps -ef | grep [p]mon>/tmp/results.$$ 2>/dev/null; awk -v dbowner=$(id -un) '{ if ($1==dbowner) { gsub(/ora_pmon_/,"",$NF); print $NF; } }' /tmp/results.$$; rm -f /tmp/results.$$

Workaround 2. Don't like the grep -v but until I find out where that } is coming from..

ps -ef | grep [p]mon | awk -v dbowner=$(id -un) '{ if ($1==dbowner) { gsub(/ora_pmon_/,"",$NF); print $NF; } }' | egrep -v 'grep|}|ASM'

Return a list of Oracle databases running on a list of remote servers[edit]

#!/bin/ksh

serverlist=`cat /home/tools/ini/system/oracle_servers | sort -n | tr "\n" " "`

if [ -z "${serverlist}" ]
then
    echo "no servers found" && exit 1
fi


for server in ${serverlist}
do
    ssh ${server} "ps -ef | grep [o]ra_pmon_" >/tmp/${server}.dblist
done

for server in ${serverlist}
do
    cat /tmp/${server}.dblist | awk -F_ -v SRV=${server} 'BEGIN {print SRV ":"} {print $NF}' | tr "\n" " "
    echo
done

Clever trick to check whether SQL output needs sending to someone[edit]

Using an exit status from SQL*Plus back to the shell so we can decide what to do. Nice one!

#!/bin/bash
tempfile=/tmp/audit_locked_accounts_$ORACLE_SID.txt

# Start sqlplus and check for locked accounts
sqlplus -S "/ as sysdba" << EOF > $tempfile
set pages 0
select 'The following accounts were found to be unlocked and should not be'
from dual;

def exit_status = 0
col xs new_value exit_status

select username
,      account_status
,      1 as xs
from   dba_users
where  account_status != 'LOCKED'
and    username in ('HR', 'SCOTT', 'OUTLN', 'MDSYS', 'CTXSYS')
/
exit &exit_status
EOF

# If the exit status of sqlplus was not 0 then we will send an email
if [ $? != 0 ]; then
    mail -s "Accounts Unlocked in $ORACLE_SID" oracle < $tempfile
fi

Check RMAN logfiles for errors from cron every day[edit]

00 09 * * * /home/tools/scripts/oracle/dosh 'find /home/tools/logs/rman -name "*online.log" -mtime -1 -exec sed -ne "/^RMAN-/,/^$/p" {} \\; -ls' | mailx
 -s 'RMAN errors last night' [email protected]

/home/ibmtools/scripts/oracle/dosh 'find /oracle/export -name "expdp*log" -mtime -1 -exec grep ORA- {} \; -ls' | mailx -s 'Datapump errors for Baxter last night' [email protected]

An alternative to getopts[edit]

These methods have the advantage of allowing arguments of any length not just 1 character

countArgs=$#
while [[ $# -gt 0 ]]
do
    idx1=$($ECHO $1|$GREP "="|wc -l)
    if [[ $idx1 -gt 0 ]]; then
        key=$($ECHO $1|$CUT -d '=' -f 1)
        value=$($ECHO $1|$CUT -d '=' -f 2)
    else
        key=$($ECHO $1|$CUT -d '=' -f 1)
        idx2=$($ECHO $1|$GREP "^-"|wc -l)
        if [[ $idx2 -eq 0 ]]; then
            $ECHO -e "\n ERROR: $1 is an unsupported argument passed to agentDeploy.sh.\n"  
            usage
            exit 1
        fi
    fi

    case "$key" in
    -help)
        if [[ $upgradeFlag ]]; then
            upgradeUsage
        else
            freshUsage
        fi
        exit 0;;
    AGENT_BASE_DIR)
        agentBaseDir=$($ECHO $value|$SED 's/\/$//')
        checkBaseFlag=TRUE;;
    OMS_HOST)
        omsHost=$value
        checkOMSHost=TRUE;;
    EM_UPLOAD_PORT)
        omsPort=$value
        checkOMSPort=TRUE;;
    AGENT_INSTANCE_HOME)
        instHome=$($ECHO $value | $SED 's/\/$//');;
    AGENT_REGISTRATION_PASSWORD)
        pswd=$value;;
    s_encrSecurePwd)
        pswd=$value;;  
    RESPONSE_FILE)
        rspFlag=TRUE  
        rspLoc=$value;;
    OLD_AGENT_VERSION)
        oldAgentVersion=$value;;            
    OLDHOME)
        oldHome=$value;;    
    -debug)
        debugSwitch=TRUE;;
    -forceConfigure)
        forceFlag=TRUE;;
    -configOnly)
        configFlag=TRUE    
        validationFlag=TRUE;;
    -agentImageLocation)
        archiveLoc=$value
        checkArchiveFlag=TRUE;;
    -invPtrLoc) shift
        ptrLoc=$1;;
    -Upgrade)
        UpgradeFlag=TRUE
        validFlag=TRUE;;
    INVENTORY_LOCATION)
        validFlag=TRUE;;
    b_forceInstCheck)
        validFlag=TRUE
        forcefullFlag=TRUE;;
    -prereqOnly)
        validationFlag=TRUE
        prereqFlag=TRUE;;
    -executeRootsh)
        validFlag=TRUE;;
    *)  idx=$($ECHO $1|$GREP "^-"|wc -l)
        if [[ $idx -eq 0 ]]; then
            validFlag=TRUE
        else
            $ECHO -e "\n ERROR: Invalid argument $key passed."
            usage
            exit 1          
        fi
    esac
    shift
done

another way - found in /etc/init.d/functions (daemon function) in Fedora

    while [ "$1" != "${1##[-+]}" ]; do
        case $1 in
        '')
            echo $"$0: Usage: daemon [+/-nicelevel] {program}" "[arg1]..."
            return 1
            ;;
        --check)
            base=$2
            gotbase="yes"
            shift 2
            ;;
        --check=?*)
            base=${1#--check=}
            gotbase="yes"
            shift
            ;;
        --user)
            user=$2
            shift 2
            ;;
        --user=?*)
            user=${1#--user=}
            shift
            ;;
        --pidfile)
            pid_file=$2
            shift 2
            ;;
        --pidfile=?*)
            pid_file=${1#--pidfile=}
            shift
            ;;
        --force)
            force="force"
            shift
            ;;
        [-+][0-9]*)
            nice="nice -n $1"
            shift
            ;;
        *)
            echo $"$0: Usage: daemon [+/-nicelevel] {program}" "[arg1]..."
            return 1
            ;;
      esac
    done

another way - found in adstrtal.sh (middleware start script for EBS)

#
# Parse Arguments
#

for nxtarg in $*
do
  arg=`echo $nxtarg | sed 's/^//'`

  case $arg in
    -secureapps)    if test "$secureapps" = "" ; then
                       secureapps=$arg
                    else
                       echo "$0: Duplicate Argument passed : $arg"
                       usage
                    fi
                ;;
    -nodbchk)       if test "$nodbchk" = "" ; then
                       nodbchk=$arg
                    else
                       echo "$0: Duplicate Argument passed : $arg"
                       usage
                    fi
                ;;
    -nopromptmsg)   if test "$nopromptmsg" = "" ; then
                       nopromptmsg=$arg
                    else
                       echo "$0: Duplicate Argument passed : $arg"
                       usage
                    fi
                ;;
    *)              if test "$unpw" = "" ; then
                       unpw=$arg
                    else
                       echo "$0: Duplicate Argument passed : $arg"
                       usage
                    fi
  esac
done

and another in adautocfg.sh

for myarg in $*
do

  arg=`echo $myarg | sed 's/^-//'`
  case $arg in
    appspass=*)
            appspass=`echo $arg | sed 's/appspass=//g'`
            shift
            ;;
    nocustom)
            myparams="$myparams $arg"
            shift
            ;;
    noversionchecks)
            myparams="$myparams $arg"
            shift
            ;;
    promptmsg=*)
            promptmsg=`echo $arg | sed 's/promptmsg=//g'`
            shift
            ;;
        *)  echo "$0: unrecognized action specified"
            exit 1
  esac
done

Run a script on multiple servers[edit]

#!/bin/ksh
# ==============================================================================
# Name         : dosh   (Distributed Oracle SHell)
# Description  : Runs a command on all Oracle servers
#
# Parameters   : h - displays help
#                v - verbose (default, like all unix commands is silent)
#                c - command to be executed
#
# Example      : ./dosh -v -c 'ls -al'
#
# Modification History
# ====================
# When      Who               What
# ========= ================= ==================================================
# 08-FEB-13 Stuart Barkley    Created
# ==============================================================================

# --------------------------------------------------------------------------
# this list of servers is generated by the DBAMON tool so will be up to date
# --------------------------------------------------------------------------
serverfile=/home/ibmtools/etc/oracle/oracle_servers
[[ -z "${serverfile}" ]] && echo "Server list ${serverfile} not found" && exit 1

serverlist=`cat ${serverfile} | sort -n | tr "\n" " "`


# -------------------------
# get the arguments, if any
# -------------------------
while getopts "hvc:" OPT
do
    case "$OPT" in
    h) echo "\nUsage: $0 [-v] [-h] -c '<command_to_be_executed_remotely>'\n";
       exit;
       ;;
    v) VERBOSE="Y";
       ;;
    c) CMMND=$OPTARG;
       ;;
    *) echo "\nUsage: $0 [-v] [-h] -c '<command_to_be_executed_remotely>'\n";
       exit;
       ;;
    esac
done
shift $((OPTIND-1))
VERBOSE=${VERBOSE:-"N"}


# --------------------------------
# check we have required arguments
# --------------------------------
[[ -z $CMMND ]] && echo "Enter command to be executed like this: $0 -c 'ls -al'" && exit 1


# ----------------------------
# loop over the remote servers
# ----------------------------
for server in ${serverlist}
do
    if [[ "$VERBOSE" == "Y" ]]; then
        echo ${server} `date +'%d-%b-%Y %H:%M:%S'`
        echo "------------------------------------"
        set -x
    fi
    ssh ${server} "$CMMND"
    set +x
    [[ "$VERBOSE" == "Y" ]] && echo
done

to be investigated... this one might be cleverer than mine...

tmpdir=${TMPDIR:-/tmp}/pssh.$$
count=0
while userhost; do
    ssh -n -o BatchMode=yes ${userhost} 'uname -a' > ${tmpdir}/${userhost} 2>&1 &
    count=`expr $count + 1`
done < userhost.lst
while [ $count -gt 0 ]; do
    wait $pids
    count=`expr $count - 1`
done
echo "Output for hosts are in $tmpdir"

improved version...
just escape double quotes and dollar signs...

#!/bin/ksh
# ==============================================================================
# Name         : dosh   (Distributed Oracle SHell)
# Description  : Runs a command on all Oracle servers
#
# Parameters   : h - displays help
#                v - verbose (default, like all unix commands is silent)
#                c - command to be executed
#
# Example      : ./dosh -v -c 'ls -al'
#
# Modification History
# ====================
# When      Who               What
# ========= ================= ==================================================
# 08-FEB-13 Stuart Barkley    Created
# 08-JUL-15 Stuart Barkley    Background execution mode
# ==============================================================================
# --------------------------------------------------------------------------
# this list of servers is generated by the DBAMON tool so will be up to date
# --------------------------------------------------------------------------
serverfile=/home/ibmtools/etc/oracle/oracle_servers
[[ -z "${serverfile}" ]] && echo "Server list ${serverfile} not found" && exit 1

serverlist=`cat ${serverfile} | sort -n | tr "\n" " "`


# -------------------------
# get the arguments, if any
# -------------------------
while getopts "hbvc:" OPT
do
    case "$OPT" in
    h) echo "\nUsage: $0 [-b] [-v] [-h] -c '<command_to_be_executed_remotely>'\n";
       exit;
       ;;
    b) BACKGROUND="Y";
       ;;
    v) VERBOSE="Y";
       ;;
    c) CMMND=$OPTARG;
       ;;
    *) echo "\nUsage: $0 [-b] [-v] [-h] -c '<command_to_be_executed_remotely>'\n";
       exit;
       ;;
    esac
done
shift $((OPTIND-1))
VERBOSE=${VERBOSE:-"N"}


# --------------------------------
# check we have required arguments
# --------------------------------
[[ -z $CMMND ]] && echo "Enter command to be executed like this: $0 -c 'ls -al'" && exit 1


# ---------------------------------
# put the thing to be run in a file
# ---------------------------------
printf "%s\n" "$CMMND" > /tmp/dosh.$$


# ----------------------------
# loop over the remote servers
# ----------------------------
for server in ${serverlist}
do
    if [[ "$VERBOSE" == "Y" ]]; then
        printf "%s\n" ${server} `date +'%d-%b-%Y %H:%M:%S'`
        printf "%s\n" "------------------------------------"
        set -x
    fi
    scp -q /tmp/dosh.$$ ${server}:/tmp/
    if [[ "$BACKGROUND" == "Y" ]]; then
        ssh -n -o BatchMode=yes ${server} "ksh /tmp/dosh.$$; rm -f /tmp/dosh.$$"> /tmp/dosh_${server}.out 2>&1 &
    else
        ssh -n -o BatchMode=yes ${server} "ksh /tmp/dosh.$$; rm -f /tmp/dosh.$$"
    fi
    set +x
    [[ "$VERBOSE" == "Y" ]] && echo
done
rm -f /tmp/dosh.$$

[[ "$BACKGROUND" == "Y" ]] && printf "%s\n" "Type 'ls -altr /tmp/dosh*out' to see output from the commands"

How can a shell script find out what directory it is in?[edit]

basename $0 does not always give the desired answer (might give "./"!

DIR="$(cd "$(dirname "$0")" && pwd)"

Array processing[edit]

array=(1 2 3)
unset array[2]
echo ${array[2]}          # null
indices=(${!array[@]})    # create an array of the indices of "array"
size=${#indices[@]}       # the size of "array" is the number of indices into it
size=${#array[@]}         # same
echo ${array[@]: -1}      # you can use slices to get array elements, -1 is the last one, etc.
for element in ${array[@]}; do    # iterate over the array without an index

for index in ${indices[@]}        # iterate over the array WITH an index
do
    echo "Index: ${index}, Element: ${array[index]}"
done

for index in ${!array[@]}         # iterate over the array WITH an index, directly

array+=("new element")    # append a new element without referring to an index
((counter++))             # shorter than ((counter=counter+1)) or ((counter+=1))
if [[ $var == 3 ]]        # you can use the more "natural" comparison operators inside double square brackets
while [[ $var < 11 ]]     # another example
echo ${array[${index}-1]  # math inside an array subscript

Send an email by talking directly to an smtp server[edit]

#!/bin/bash
telnet smtp.domain.com 25 <<EOTXT>>/tmp/smtp.log
HELO me.domain.com
MAIL FROM:<[email protected]>
RCPT TO:<[email protected]>
DATA
From: Stuart <[email protected]>
To: Anne <[email protected]>
Subject: testing smtp email

Hello, this should appear in the body
.
QUIT
EOTXT

Send an email by talking directly to an smtp server via file descriptor (no telnet! this time), adding authentication[edit]

#!/bin/bash

#
# mail.sh
#
# 2008 - Mike Golvach - [email protected]
# 2010 - Rayber
#
# Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License
#

if [ $# -ne 7 ]
then
echo "Usage: $0 FromAdress ToAdress Domain MailServer MailTextFile AuthEmail AuthPass"
exit 1
fi

from=$1
to=$2
domain=$3
mailserver=$4
mailtext=$5
authemail=`echo $6|openssl enc -base64|awk 'sub("..$", "")'`
authpass=`echo $7|openssl enc -base64|awk 'sub("..$", "")'`

if [ ! -f $mailtext ]
then
echo "Cannot find your mail text file. Exiting..."
exit 1
fi

exec 9<>/dev/tcp/$mailserver/25
echo "HELO $domain" >&9
read -r temp <&9
echo "$temp"
echo "auth login" >&9
read -r temp <&9
echo "$authemail" >&9
read -r temp <&9
echo "$authpass" >&9
read -r temp <&9
echo "Mail From: $from" >&9
read -r temp <&9
echo "$temp"
echo "Rcpt To: $to" >&9
read -r temp <&9
echo "$temp"
echo "Data" >&9
read -r temp <&9
echo "$temp"
cat $mailtext >&9
echo "." >&9
read -r temp <&9
echo "$temp"
echo "quit" >&9
read -r temp <&9
echo "$temp"
9>&-
9<&-
echo "All Done Sending Email. See above for errors"
exit 0

rsync examples[edit]

Also see Distribute files to multiple servers using rsync and ssh

#!/bin/sh
ssh  <remote_host> '/bin/mkdir -p /etc /etc/rc.config.d /etc/security /etc/mail'
rsync --rsync-path /usr/bin/rsync -Liprogtz --out-format=%f%L  /etc/passwd /etc/passwd.post /etc/group /etc/hosts /etc/services /etc/resolv.conf /etc/exclude.rootvg <remote_host>:/etc
rsync --rsync-path /usr/bin/rsync -Liprogtz --out-format=%f%L  /etc/hosts.allow.xcat <remote_host>:/etc/hosts.allow
rsync --rsync-path /usr/bin/rsync -Liprogtz --out-format=%f%L  /etc/rc.config.d/sap <remote_host>:/etc/rc.config.d
rsync --rsync-path /usr/bin/rsync -Liprogtz --out-format=%f%L  /etc/security/group /etc/security/limits /etc/security/login.cfg /etc/security/passwd /etc/security/user <remote_host>:/etc/security
rsync --rsync-path /usr/bin/rsync -Liprogtz --out-format=%f%L  /etc/mail/sendmail.cf <remote_host>:/etc/mail

rsync -av --progress /home/ibmtools/scripts/oracle/* benouerp07:/home/ibmtools/scripts/oracle/

Handy aliases[edit]

Strip out comments and blank lines from a file

alias strip='grep -Ev '\''^(#|$)'\'''

Does a ps and a grep

alias psg='ps -ef | grep -v $$ | grep -i '

Getting a decent listing of filesystem space available. It is ordered such that the filesystems with no space left are at the end.

OS=$(uname -s)
[[ "$OS" == "SunOS" ]] && alias dfg='df -h|sed -e '1d'|sort -n -k5|awk '\'' BEGIN {printf("%-35s%-10s%-10s%-6s%-30s\n","Filesystem","Total","Free","%Used","Mounted on")} {printf("%-35s%-10s%-10s%-6s%-30s\n",$1,$2,$4,$5,$6)}'\'''
[[ "$OS" == "AIX" ]]   && alias dfg='df -g|sed -e '1d'|sort -n -k4|awk '\'' BEGIN {printf("%-35s%-10s%-10s%-6s%-30s\n","Filesystem","Total GB","Free","%Used","Mounted on")} {printf("%-35s%-10s%-10s%-6s%-30s\n",$1,$2,$3,$4,$7)}'\'''

A handy way of listing subdirectories and their files

alias filetree="find . -print | sed -e 's;[^/]*/;|____;g;s;____|; |;g'"

Watch progress of a copy

alias cpProgress="rsync --progress -ravz"

Reboots Linksys router

alias rebootlinksys="curl -u 'admin:password' 'http://192.168.1.2/setup.cgi?todo=reboot'"

Nice one for bash. Colour codes the prompt depending on the outcome of the previous command

bash_prompt_command()
{
    RTN=$?
    prevCmd=$(prevCmd $RTN)
}
PROMPT_COMMAND=bash_prompt_command
prevCmd()
{
    if [ $1 == 0 ] ; then
        echo $GREEN
    else
        echo $RED
    fi
}
if [ $(tput colors) -gt 0 ] ; then
    RED=$(tput setaf 1)
    GREEN=$(tput setaf 2)
    RST=$(tput op)
fi
export PS1="\[\e[36m\]\u.\h.\W\[\e[0m\]\[\$prevCmd\]>\[$RST\]"

Mmmm, to be looked into. Executes remote commands on a unix box using curl.

#/bin/sh
#
# WAG320N-HACK
# Ver. 1.0
# 12/09/2010
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Set username and password in the form of "username:password"
# example: "admin:admin"
my_access="admin:admin"

# Parameters test
if [ -z "$1" ]
then
  echo "wag320n-hack.sh: missing remote command"
  echo "usage: wag320n-hack.sh <remote command>"
  echo "example: wag320n-hack.sh /bin/ls -la /usr/sbin"
  echo "Note: always use full path"
  echo ""
  echo "wag320n-hack.sh - Ver. 1.0 - 12/09/2010"
  echo "Licensed under GPL V. 3"
  echo ""
  exit 0
fi

# Get the command
my_command="ping_size="'$('"$@"' 1>&2)'

curl -s -G -u "$my_access" --data-urlencode 'todo=ping_test' --data-urlencode 'this_file=Diagnostics.htm' --data-urlencode 'next_file=Ping.htm' --data-urlencode 'c4_ping_ipaddr=192.168.1.1' --data-urlencode 'ping_timeout=5000' --data-urlencode 'ping_interval=1000' --data-urlencode 'ping_number=1' --data-urlencode "$my_command" http://192.168.1.1/setup.cgi | sed -e '/HTTP\/1.0 200 OK/q'

How to configure SSH with public/private keys[edit]

unixpeople.com

Use SSH config file[edit]

Host server10
  Hostname 1.2.3.4
  IdentityFile ~/.ssh/id_dsa
  user foobar
  Port 30000
  ForwardX11Trusted yes
  TCPKeepAlive yes

then just connect using

ssh server10

A decent sed tutorial[edit]

From grymoire.com

A decent korn/bash shell tutorial[edit]

From dartmouth.edu Reproduced here just in case it disappears! Advanced shell scripting

trap[edit]

     Example Handling Traps With ksh - Discussion of the kill command


EXAMPLE TEMPLATE:


PRODUCT:    HP-UX 11iV1 Version B.11.11
            HP Tru64 V5.1B PK4
            Sun/Solaris SunOS V5.8
            Linux 2.6 kernel


COMPONENT:  ksh


SOURCE:     Philippe Vouters
            Fontainebleau/France


LOW COST HIGH-TECH PRODUCTS:  http://techno-star.fr


OVERVIEW:

The ksh script below shows how to eventually handle traps in the situation 
where someone might try to kill a script by killing individual commands run 
by that script or the entire process group a script is running in. The kill 
command (usually a shell builtin) may be used to send a signal to a process 
group (with the -<pid> syntax) or an individual process. The example ksh 
script below runs /bin/sleep as the foreground process, the example ksh 
scripts immediately returns when the /bin/sleep process has terminated. Most 
signals sent to the shell are ignored until after the foreground process 
terminates. This is in order to avoid creating zombie processes. Therefore a 
kill <pid> on the example ksh script waits for the termination of the 
/bin/sleep process.

The status value $? in the trap refers to the exit status of the command to run 
and therefore is the exit status of the /bin/sleep process. The called function 
in the trap handler shows how to correctly examine the effect of the kill 
command on the shell or it's children.

To examine the value of $? in a trap handler means that you must understand what
it can be set and how different signals delivered to either the shell or the 
foreground process (or the process group) might affect the value of $?.

The example shell script prints $? using echo but it does not perform tests on 
the value of $?. For a complete solution when attempting to trap signals in a 
shell you would also need code that examined the value of $? after the 
foreground process had completed.


*** CAUTION ***

This sample script has been tested using HP-UX B.11.11, HP Tru64 V5.1B PK4, 
SunOS V5.8 and Fedora Core 4 (homed version of Red Hat Linux).  However, we
cannot guarantee its effectiveness because of the possibility of error in 
transmitting or implementing it. It is meant to be used as a template for 
writing your own scripts, and may require modification for use on your system. 


SCRIPT NOTES:

To notice that the ksh script and /bin/sleep share the same process group
identifier (PGID), issue the following commands:

[philippe@victor ~]$ who
philippe :0           Jan 10 10:16
philippe pts/1        Jan 10 21:30 (:0.0)
philippe pts/2        Jan 10 21:30 (:0.0)
[philippe@victor ~]$ tty
/dev/pts/1
[philippe@victor ~]$ ps -j -t pts/2
  PID  PGID   SID TTY          TIME CMD
11072 11072 11072 pts/2    00:00:00 bash
11113 11113 11072 pts/2    00:00:00 ksh
11116 11113 11072 pts/2    00:00:00 sleep

In this case sending kill -INT -11113 will send SIGINT to the process group 
11113. Both of the ksh and sleep processes are contained within this process 
group.

Important Note:

On HP-UX, you have to $ export UNIX95=1 in order to be able to use the
-j option of the ps command.


SCRIPT:

                             COPYRIGHT (C) 2005 BY
                              HEWLETT-PACKARD COMPANY
                                ALL RIGHTS RESERVED.

     THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
     ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND WITH THE INCLUSION
     OF THE ABOVE COPYRIGHT NOTICE.  THIS SOFTWARE OR ANY OTHER COPIES
     THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY OTHER
     PERSON.  NO TITLE TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY TRANSFERRED.

     THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE AND
     SHOULD NOT BE CONSTRUED AS A COMMITMENT BY HEWLETT-PACKARD COMPANY.

     HP ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS
     SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY HP.

     NO RESPONSIBILITY IS ASSUMED FOR THE USE OR RELIABILITY OF SOFTWARE
     ON EQUIPMENT THAT IS NOT SUPPLIED BY HEWLETT-PACKARD COMPANY.

     SUPPORT FOR THIS SOFTWARE IS NOT COVERED UNDER ANY HP SOFTWARE
     PRODUCT SUPPORT CONTRACT, BUT MAY BE PROVIDED UNDER THE TERMS OF THE
     CONSULTING AGREEMENT UNDER WHICH THIS SOFTWARE WAS DEVELOPED.

#!/bin/ksh
function handle_signal
{
        print -n "pid $$ recieved $2 "
        if [[ $1 = 0 ]];then
            print but foreground command ended successfully
        else
                if [[ $1 = $3 ]];then
                    print and so did the last foreground command
                else
                    print -n "and the exit status of the last foreground "
                    print command was $1
                fi
        fi
        # Kill our process group and then ourselves with SIGTERM, giving a 
        # pid of 0 sends the signal to our process group. Killing the process
        # group should kill us as well, this assumes that SIGTERM is not 
        # handled by any process in the process group.
        #
        # This code could be replaced with an exit with an exit value that
        # would indicate what the problem was to the caller. That is replace 
        # these two lines with:
        #
        # exit $3
        #
        # or a specific exit code could be used.
        #
        kill -TERM 0
        kill -TERM $$
        }
OS=$(uname -a | awk '{print $1}')
if [[ "$OS" = "Linux" ]]; then
    offset=256
elif [[ ("$OS" = "HP-UX") || 
        ("$OS" = "SunOS") || 
        ("$OS" = "OSF1") ]]; then
   offset=128
fi
trap 'RC=$?; handle_signal $RC SIGINT $offset+2' INT
trap 'RC=$?; handle_signal $RC SIGQUIT $offset+3' QUIT
/bin/sleep 20
echo $?

DNS not working[edit]

Ping to an IP address works

ping 74.125.136.103

but this doesn't

ping www.google.com

Check resolv.conf

cat /etc/resolv.conf
nameserver 95.130.132.17
nameserver 95.130.132.18

I had changed internet provider and forgot to update this. Just to set it to the router address and let that do the resolution

nameserver 192.168.1.1

File descriptors[edit]

exec 3<> /tmp/foo  #open fd 3 for r/w
echo "test" >&3
exec 3>&- #close fd 3.

exec 3<> myfile.txt
while read line <&3
do {
  echo "$line"
  (( Lines++ ));                   #  Incremented values of this variable
                                   #+ accessible outside loop.
                                   #  No subshell, no problem.
}
done
exec 3>&-

echo "Number of lines read = $Lines"     # 8

Mmm. See our output and also tee it to a log file!

#!/bin/bash

echo hello

if test -t 1; then
    # Stdout is a terminal.
    exec >log
else
    # Stdout is not a terminal.
    npipe=/tmp/$$.tmp
    trap "rm -f $npipe" EXIT
    mknod $npipe p
    tee <$npipe log &
    exec 1>&-
    exec 1>$npipe
fi

echo goodbye

Create new image with kvm[edit]

Ref: http://www.cyberciti.biz/faq/kvm-virtualization-in-redhat-centos-scientific-linux-6/
Build an empty space for a CentOS virtual machine

qemu-img create -f qcow2 centos.img 12G

Tried creating image with

sudo virt-install -n CentOS --description "Trying out CentOS" --ram=1024 --vcpus=1 --cpu host --hvm --cdrom /home/bey9at77/Downloads/c6-x86_64-20130910-1.qcow2 --graphics vnc --disk path=/var/lib/libvirt/images/centos.img,bus=virtio,size=10

gives error

Starting install...
Allocating 'centos.img'                                                                                                                                                                                               |  10 GB     00:00     
ERROR    internal error Process exited while reading console log output: char device redirected to /dev/pts/1
qemu-kvm: -drive file=/home/bey9at77/Downloads/c6-x86_64-20130910-1.qcow2.bz2,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw: could not open disk image /home/bey9at77/Downloads/c6-x86_64-20130910-1.qcow2: Permission denied

rpm / yum commands[edit]

Install an RPM Package[edit]

rpm -ivh pidgin-2.7.9-5.el6.2.i686.rpm

-i - install
-v - verbose
-h - print progress hashes

Check dependencies of RPM Package before Installing[edit]

rpm -qpR BitTorrent-5.2.2-1-Python2.4.noarch.rpm

-q - query
-p - list package capabilities
-R - list dependent package capabilities

Install RPM Package with all dependencies[edit]

yum install BitTorrent-5.2.2-1-Python2.4.noarch.rpm

Install RPM Package with all dependencies (when RPM has been downloaded to local machine)[edit]

yum localinstall BitTorrent-5.2.2-1-Python2.4.noarch.rpm

Force Install a RPM Package without dependencies[edit]

Package will not work if dependencies are required

rpm -ivh --nodeps BitTorrent-5.2.2-1-Python2.4.noarch.rpm

Check an Installed RPM Package[edit]

rpm -q BitTorrent

List all files of an installed RPM package[edit]

rpm -ql BitTorrent

List All Installed RPM Packages[edit]

rpm -qa

Query information about an installed RPM package[edit]

rpm -qi vsftpd

Query information about a not yet installed RPM package[edit]

rpm -qip sqlbuddy-1.3.3-1.noarch.rpm

(Forcibly) Remove an RPM Package[edit]

Use package name (as seen in -qi above), not full name

rpm -ev (--nodeps) vsftpd

Query a file that was installed as part of an RPM Package (which package contained this file)[edit]

rpm -qf /usr/bin/htpasswd

Verify an RPM package[edit]

Compares information of installed files of the package against the rpm database

rpm -Vp sqlbuddy-1.3.3-1.noarch.rpm

Rebuild corrupted RPM database[edit]

cd /var/lib
rm __db*
rpm --rebuilddb
rpmdb_verify Packages

Install rpmforge repository[edit]

Download rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
Import the key

sudo rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt

Install the repository

sudo rpm -i rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm

Check the installation

rpm -K rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm

Test it

sudo yum install terminator

Install rpmfusion repository[edit]

su -c 'yum localinstall --nogpgcheck http://download1.rpmfusion.org/free/el/updates/6/i386/rpmfusion-free-release-6-1.noarch.rpm http://download1.rpmfusion.org/nonfree/el/updates/6/i386/rpmfusion-nonfree-release-6-1.noarch.rpm'

config file for yum[edit]

Checkout this file for global yum config

/etc/sysconfig/yum-cron-background

Setup Oracle Enterprise Linux (RedHat) with yum server[edit]

You need to download the yum .repo file from the server, as per the steps below. After this, you need to enable a flag in the .repo file as per your operating system version. Having done these two steps, when you run yum install <pkgname> command on your linux box, the Oracle's yum server will be scanned, the dependent & the relevant rpm's will be download and installed for you.

cd /etc/yum.repos.d

To download files here

wget http://public-yum.oracle.com/public-yum-el5.repo

A file named public-yum-el5.repo will be created in your directory
Edit this file and enter enabled=1 against the operating systems which is relevant to you

vi public-yum-el5.repo

Next run the yum command

yum install package-name

To change to static IP address (Raspberry Pi)[edit]

As root:

cd /etc/networks
vi interfaces

replace the line “iface eth0 inet dhcp” with

iface eth0 inet static
address 192.168.1.100
netmask 255.255.255.0
gateway 192.168.1.1

You should also take a look at the file /etc/resolv.conf and check it has a nameserver entry (probably pointing at your default gateway) or direct to your ISP name servers.

nameserver 192.168.1.1

Troubleshoot wireless network problems[edit]

connect to wifi network from command-line in linux - from blackmoreops.com

Short summary of all the things you need to do in just few lines

root@kali:~# iw dev
root@kali:~# ip link set wlan0 up
root@kali:~# iw wlan0 scan
root@kali:~# wpa_passphrase blackMOREOps >> /etc/wpa_supplicant.conf
root@kali:~# wpa_supplicant -i wlan0 -c /etc/wpa_supplicant.conf
root@kali:~# iw wlan0 link
root@kali:~# dhclient wlan0
root@kali:~# ping 8.8.8.8
(Where wlan0 is wifi adapter and blackMOREOps is SSID)
(Add Routing manually)
root@kali:~# ip route add default via 10.0.0.138 dev wlan0

To change to static IP address (Redhat/CentOS)[edit]

As root:

vi /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=STATIC
IPADDR=192.168.1.111
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
ONBOOT=yes
DNS1=8.8.8.8
DNS2=8.8.4.4

Resrart the network interface

/etc/init.d/network stop
/etc/init.d/network start
or
service network restart

Check name server entry in resolv.conf

vi /etc/resolv.conf
nameserver 192.168.1.1

Enable processes / services to start at boot time[edit]

sudo chkconfig httpd on
sudo chkconfig mysqld on

Run a command on lots of servers in parallel[edit]

This is a damn fine AIX utility - part of the CSM Distributed Shell.

dsh -a "ls -al /etc/apache2/*conf"

will list the Apache configuration file on all reachable servers (nodes)

Download a gzip file and pipe it into tar[edit]

cd ~ && wget -O - "https://www.dropbox.com/download?plat=lnx.x86_64" | tar xzf -

Check in a script to make sure it is run only by root[edit]

RUID=`/usr/bin/id|$AWK -F\( '{print $1}'|$AWK -F\= '{print $2}'`
if [ ${RUID} != "0" ];then
   $ECHO "This script must be executed as root"
   exit 1
fi

Set terminal to use Backspace key to erase previous character instead of Control-H[edit]

Been looking for this for a long time.
You can put:

stty erase <CTRL-V><Backspace key>

in your .profile but this will be ruined if you do a copy/paste into another file.
I wanted a way of doing this without entering the control character in the .profile. Finally stumbled upon it. And it's so simple. Just escape the caret!

stty erase \^?

Put this in the .profile. It's copy/pastable and it works!
If you want CTRL-H to be your erase character, just do this:

stty erase \^H

Play with the terminal settings and reset them again either side of requesting a password[edit]

The -g option of stty gives a compact list of all the settings or the terminal and can be used as input to stty

OLDCONFIG=`stty -g`          # save terminal configuration
stty -echo                   # turn character echoing off
echo "Enter password: \c"
read PASSWD                  # get the password
stty $OLDCONFIG              # restore terminal configuration

Reset terminal to "sane" characteristics[edit]

If you've done a cat of a binary file or something else weird and your terminal is left in a mess, the following key sequence should bring it back to normal

<CTRL-J>stty sane<CTRL-J>

Install OpenOffice on RedHat Enterprise when yum install doesn't![edit]

Download Package

wget http://sourceforge.net/projects/openofficeorg.mirror/files/4.0.1/binaries/en-US/Apache_OpenOffice_4.0.1_Linux_x86-64_install-rpm_en-US.tar.gz/download -O Apache_OpenOffice_4.0.1_Linux_x86-64_install-rpm_en-US.tar.gz

Change to root

sudo su -

Remove the old stuff

yum remove openoffice* libreoffice*

Extract Package

tar -xvf Apache_OpenOffice_4.0.1*
cd en-US

Install Package and exit root

rpm -Uvh RPMS/*.rpm RPMS/desktop-integration/openoffice4.0-redhat-*.rpm
exit

Start it

openoffice4

What does this do?[edit]

while IFS= read -r line; do
    echo "[$(date "+%F %T")] - $line"
done < <(iwevent)

or

while IFS= read -r line; do
    printf "%s\n%s\n" "$line" "Yohooo! One more package."
done < <(tcpdump -i any -nS)

List of Special Characters and what they mean[edit]

From Bruce Barnett

Character	Where	Meaning
<RETURN>	csh, sh	Execute command
#	csh, sh, ASCII files	Start a comment
<SPACE>	csh, sh	Argument separator
`	csh, sh	Command substitution
"	csh, sh	Weak Quotes
'	csh, sh	Strong Quotes
\	csh, sh	Single Character Quote
variable	sh, csh	Variable
variable	csh, sh	Same as variable
|	csh, sh	Pipe character
^	sh	Pipe Character
&	csh, sh	Run program in background
?	csh, sh	Match one character
*	csh, sh	Match any number of characters
;	csh, sh	Command separator
;;	sh	End of Case statement
~	csh	Home Directory
~user	csh	User's Home Directory
!	csh	History of Commands
-	Programs	Start of optional argument
$#	csh, sh	Number of arguments to script
$*	csh, sh	Arguments to script
$@	sh	Original arguments to script
$-	sh	Flags passed to shell
$?	sh	Status of previous command
$$	sh	Process identification number
$!	sh	PID of last background job
&&	sh	Short-circuit AND
||	sh	Short-circuit OR
.	csh, sh	Typ. filename extension
.	sh	Source a file and execute as command
:	sh	Nothing command
:	sh	Separates Values in environment variables
:	csh	Variable modifier
Character	Where	Meaning
[ ]	csh, sh	Match range of characters
[ ]	sh	Test
%job	csh	Identifies job Number
(cmd;cmd)	csh. sh	Runs cmd;cmd as a sub-shell
{ }	csh	In-line expansions
{cmd;cmd }	sh	Like (cmd;cmd ) without a subshell
>ofile	csh, sh	Standard output
>>ofile	csh, sh	Append to standard output
<ifile	csh, sh	Standard Input
<<word	csh, sh	Read until word, substitute variables
<<\word	csh, sh	Read until word, no substitution
<<-word	sh	Read until word, ignoring TABS
>>!file	csh	Append to file, ignore error if not there
>!file	csh	Output to new file, ignore error if not there
>&file	csh	Send standard & error output to file
<&digit	sh	Switch Standard Input to file
<&-	sh	Close Standard Input
>&digit	sh	Switch Standard Output to file
>&-	sh	Close Standard Output
digit1<&digit2	sh	Connect digit2 to digit1
digit<&-	sh	Close file digit
digit2>&digit1	sh	Connect digit2 to digit1
digit>&-	sh	Close file digit

@@ Line 1: / Line 1: @@
+* [http://hyperpolyglot.org/unix-shells#var-expansion Good shell comparison including variable expansion - hyperpolyglot.org]
+* [http://pubs.opengroup.org/onlinepubs/9699919799/utilities/toc.html Shell coding standards - opengroup.org]
+* [http://aix4admins.blogspot.be aix4admins]
 * [http://linuxgazette.net/issue55/okopnik.html The Deep, Dark Secrets of Bash]
 * [http://www.speakeasy.org/~arkay/216-7.4KshFunctions.html Korn Shell Functions]
@@ Line 5: / Line 8: @@
 * [http://www.grymoire.com/unix/Quote.html Unix quoting from from Bruce Barnett (grymoire)]
 * [http://www.mpi-inf.mpg.de/departments/rg1/teaching/unixffb-ss98/quoting-guide.html Another excellent quoting tutorial]
+* [http://aix4admins.blogspot.be/2015/02/snapshot-fs-snapshot-snapshot-is-state.html AIX snapshot technology]
 * [[RaspberryPi]]
 * [[SSH]]
-* [http://www.anattatechnologies.com/q/2013/04/multiuser-screen/ Screen sharing from Unix]
+* [http://www.anattatechnologies.com/q/2013/04/multiuser-screen/ Screen sharing from Unix using screen]
+* [https://robots.thoughtbot.com/a-tmux-crash-course Screen sharing from Unix using tmux]
+* [http://www.csb.yale.edu/userguides/wordprocess/vi-summary.html Handy ex and vi reference]
+* [[Fedora install for my own purposes]]
-===double hash and double percent in shell variables to trim off characters from variables===
+===How to automatically download and process email attachments from Gmail===
+==== Useful references====
+* [http://www.courier-mta.org/maildrop/maildrop.html maildrop]
+* [http://www.wonkity.com/~wblock/docs/html/maildrop.html Using maildrop As A Mail Delivery Agent (MDA)]
+* [http://manpages.ubuntu.com/manpages/trusty/man7/maildropex.7.html .mailfilter examples]
+* [https://www.axllent.org/docs/view/gmail-pop3-with-fetchmail/ Setting up fetchmail with Gmail]
+* [https://www.linode.com/docs/email/clients/using-fetchmail-to-retrieve-email/ Using Fetchmail to Retrieve Email]
+Eventually, after months of trying different things, came up with this combination of tools that worked very well.
+====Install tools====
 <pre>
-FILENAME="hello.txt"
+sudo dnf -y install fetchmail maildrop uudeview openssl
-FILE_STUB1=${FILENAME##*/}
-FILE_STUB=${FILE_STUB1%.*}
-echo $FILE_STUB
-hello
 </pre>
-===split variable (eg. filename) into separate variables using set===
+* Set Gmail account up for POP and disable IMAP
+====Configure fetchmail====
+This is the part that talks to Gmail and downloads the emails to the local machine.
 <pre>
-FILENAME="split_this_into_bits"
+vi ~/.fetchmailrc
-set $(echo ${FILENAME} | sed 's/_/ /g')
-echo $4 $3 $2 $1
+set postmaster "<username>"
-bits into this split
+#set daemon 600
+poll pop.gmail.com with proto POP3
+    user "[email protected]" there with password '<password>' is <username> here options ssl nokeep
+    mda "/usr/bin/maildrop .mailfilter"
+#    sslcertfile /etc/ssl/certs/ca-bundle.crt
 </pre>
-===Centre align text on a line in bash shell===
+If fetchmail complains about ssl certificates, try specifying wherein is with the sslcertfile line
-Doesn't work in Korn shell due to %*s
+==== Configure maildrop====
 <pre>
-#COLUMNS=$(tput cols)   # width of the current window
+maildirmake maildrop
-COLUMNS=80
+maildirmake backup
-title="Hello world!"
-printf "%*s\n" $(((${#title}+$COLUMNS)/2)) "$title"
+vi ~/.mailfilter
+LOGFILE = "/home/dbahawk/maildrop/maildrop.log"
+DEFAULT="$HOME/maildrop"
+# keep a copy
+cc backup
+`cd backup/new && rm -f dummy \`ls -t | sed -e 1,50d\``
+if (/^To:.*getmail@...\.dnsalias\.org$/)
+   {
+        to Maildir/getmail/
+   }
+#if (/^To:.*dbahawk/)
+#   {
+#        to maildrop
+#   }
+if (/^To:.*dbahawk/)
+    dotlock "auto.lock" {
+    to "|uudeview -c -i"
+}
 </pre>
-and as a one-liner
+Not really sure why this filter is not working properly. The cc works but the To: check doesn't. So I have a shell that runs separately to process the emails in the backup mail directory.
+====uudeview====
+This is a clever program that can extract attachments from emails and put them in a directory of you choosing.<br />
+This shell runs from cron at regular intervals to run the whole process
 <pre>
-printf "%*s\n" $(( ( $(echo $* | wc -c ) + 80 ) / 2 )) "$*"
+#!/usr/bin/ksh
+# fetch any new mail from Gmail (uses .fetchmailrc)
+# fetchmail log is $HOME/maildrop/maildrop.log
+fetchmail -d0
+# fetchmail uses maildrop as mda (uses .mailfilter) to save messages to a maildir.
+# this is not working correctly but still copies the messages to backup
+# pull out the attachments and send them to the incoming directory for the collector to process when it wakes up
+uudeview -c -i -p ~/Downloads/dbahawk_forward backup/new/*
 </pre>
-This works in Korn shell...
+===Use sed to repeat characters===
+echo an '=' sign then use the loop feature of sed to run round a loop a further 79 times replacing what you've got with the same thing plus and extra one!
 <pre>
-TITLE="$1"
+echo "=" | sed -e :a -e 's/^=\{1,79\}$/&=/;ta'
-LINEWIDTH=80
+</pre>
-LPAD=$(((${#TITLE}+$LINEWIDTH)/2))
+===Convert between lower and upper case using ansi standard===
-printf %${LPAD}s "$TITLE"
+This way should be portable and give predictable results
+<pre>
+LOWER_SID=$(echo "${SID}" | tr '[:upper:]' '[:lower:]')
+UPPER_SID=$(echo "${SID}" | tr '[:lower:]' '[:upper:]')
 </pre>
+===Use sed to delete the first line of a file or command output printing from the second line onwards===
-===Right justify text on a line with leader dots!===
+Actually deceptively simple. Example remove the header from df output.
 <pre>
-function rpadwait {
+df -k | sed 1d
-    text=$1
-# -------------------------
-# suppress newline for echo
-# -------------------------
-N=
-C=
-if echo "\c" | grep c >/dev/null 2>&1; then
-    N='-n'
-else
-    C='\c'
-fi
+or more formally
-    echo ${N} "${text}${C}" | sed -e :a -e 's/^.\{1,80\}$/&\./;ta'
+df -k | sed -e '1,1d'
-}
+</pre>
+As a useful extension, suppose TO_DATA_DIR contains multiple directories, this will total the free space for all relevant filesystems<br />
+This one is specific to AIX, for other Unixes and Linux, use $4 instead of $3.
+<pre>
+SPACE_AVAILABLE=$(df -k $TO_DATA_DIR | sed 1d | awk 'BEGIN {i=0} {i=i+$3} END {print i}')
+</pre>
+===Use sed to munge a controlfile into submission!===
+* delete comment lines
+* delete all lines after the one starting with a semicolon
+* delete all blank lines
+* change reuse to set
+* change archivelog (with word boundaries) to noarchivelog
+* change old sid to new sid
+<pre>
+sqlplus -s / as sysdba<<'EOSQL' >/dev/null
+alter database backup controlfile to trace as '/tmp/regenerate_controlfile.sql' reuse resetlogs;
+EOSQL
+OLDSID='PROD'
+NEWSID='TEST'
+sed  -e '/^--/d' -e '/^\;/q' -e '/^ *$/d' -e 's/REUSE/SET/' -e 's/\<ARCHIVELOG\>/NOARCHIVELOG/' -e 's/\"'${OLDSID}'\"/\"'${NEWSID}'\"/' /tmp/regenerate_controlfile.sql
+</pre>
+===Find all files where a certain text does not exist===
+Mostly we want to search for files containing a particular string but how to find those files that do not contain some text.<br />
+Using xargs instead of -exec forces the filename to be printed. -H should do this but doesn't seem to in this case.
+<pre>
+find . -name "*cfg" | xargs grep -H -c TO_CV_HOST {} \; | grep ':0$' | cut -d: -f1
 </pre>
-===Find long-running processes with a cron job===
+===Use tar and gzip to copy files more efficiently across network between hosts===
-Processes running longer than 24 hours have a date instead of a start time...
+From the destination server, this will connect to the source, tar up each file and pull it back to the current server
 <pre>
-08,14 * * * /home/ibmtools/scripts/oracle/dosh -vc "ps -ef|grep 'ibmtools/scripts/oracle'|perl -nae 'print if \$F[4] !~/:/'" >/tmp/lrp.txt; [[ $(grep -c ibmtools /tmp/lrp.txt) -ne 0 ]] && cat /tmp/lrp.txt|mailx -s '*** long running processes - please check ***' reporting@companymail.com
+ssh oracle@hn5211 "cd /oracle/ora_data4/iten3/ && tar -cf - . | gzip " | ( cd /oracle/ora_data2/iten/ && gunzip -c | tar -xvf - . )
 </pre>
-===Process command line arguments in shell===
+===double hash and double percent in shell variables to trim off characters from variables===
-Borrowed from Mozilla Firefox installer
+<nowiki>#</nowiki>  - trims everything from the start of line till the FIRST occurrence of following character (abstemious) :-)<br />
+<nowiki>##</nowiki> - trims everything from the start of line till the LAST occurrence of following character (greedy)<br />
+%  - trims everything from the end of line backwards till the FIRST occurrence of following character (abstemious)<br />
+%% - trims everything from the end of line backwards till the LAST occurrence of following character (greedy)
 <pre>
-## Command line arg defaults
+FILENAME="/home/bey9at77/hello.txt"
-##
+FILE_STUB1=${FILENAME##*/}
-moz_debug=0
+FILE_STUB=${FILE_STUB1%.*}
-moz_debugger=""
+echo $FILE_STUB
-moz_debugger_args=""
+hello
-#
+FILE_EXT=${FILENAME##*.}
-##
+echo $FILE_EXT
-## Parse the command line
+txt
-##
+</pre>
-while [ $# -gt 0 ]
+or<br />
-do
+<nowiki>#</nowiki> - remove prefix reluctantly<br />
-   case $1 in
+<nowiki>##</nowiki> - remove prefix greedily<br />
-     -g | --debug)
+% - remove suffix reluctantly<br />
-      moz_debug=1
+%% - remove suffix greedily<br />
-      shift
+<pre>
-      ;;
+words="do.re.mi"
-    -d | --debugger)
-      moz_debugger=$2;
+echo ${words#*.}
-      if [ "${moz_debugger}" != "" ]; then
-	shift 2
+echo ${words##*.}
-       else
-        echo "-d requires an argument"
+echo ${words%.*}
-        exit 1
-      fi
+echo ${words%%.*}
-      ;;
+</pre>
-    -a | --debugger-args)
-      moz_debugger_args=$2;
+===The best shell script ever. An example of how scripting should be done===
-      if [ "${moz_debugger_args}" != "" ]; then
+It was written by someone at Oracle. Unfortunately (s)he did not put any author comment in it. Also unfortunately I cannot show it here as it is protected behind Oracles support website.<br />
-	shift 2
+If you have an Oracle Metalink id, you can get the complete script [https://support.oracle.com/epmos/faces/DocumentDisplay?id=949322.1 here]<br />
-      else
+Here is a snippet of a function that demonstrates proper commenting and a very good style.<br >
-        echo "-a requires an argument"
+The script is called physru.sh and upgrades an Oracle database in a rolling upgrade fashion by using a physical standby.<br />
-        exit 1
+There are 4500 lines in the full script but it is so easy to read and understand because of the way it's written, it's like a breath of fresh air. Well done whoever you are!
-      fi
+<pre>
-      ;;
+###############################################################################
-    *)
+# NAME:        wait_mrp_active
-      break;
+#
-      ;;
+# DESCRIPTION:
-  esac
+#   Wait for $MRP_START_TIMEOUT minutes to confirm that the MRP is active.  If
-done
+#   we can't detect an active MRP, abort the script with an error.
 #
-##
+# INPUT(S):
-## Program name given in $1
+#   Arguments:
-##
+#     $1: database user
-if [ $# -gt 0 ]
+#     $2: user password
-then
+#     $3: tns service name
-	MOZ_PROGRAM=$1
+#     $4: database unique name
-	shift
+#
+#   Globals:
+#     None
+#
+# RETURN:
+#   None
+#
+###############################################################################
+wait_mrp_active()
+{
+  display "confirming media recovery is running"
+  l_wma_status=1
+  l_wma_curtime=`perl -e 'print int(time)'`
+  l_wma_exptime=`expr $MRP_START_TIMEOUT "*" 60`
+  l_wma_maxtime=`expr $l_wma_curtime + $l_wma_exptime`
+  while [ "$l_wma_curtime" -lt "$l_wma_maxtime" ]
+  do
+    is_mrp_running $1 $2 $3 $4
+    if [ "$?" -gt "0" ]; then
+      l_wma_status=0
+       break
+    fi
+    sleep $MRP_START_INTERVAL
+    l_wma_curtime=`perl -e 'print int(time)'`
+  done
+  chkerr $l_wma_status "could not detect an active MRP after $MRP_START_TIMEOUT minutes"
+}
+</pre>
+===split variable (eg. filename) into separate variables using set===
+<pre>
+FILENAME="split_this_into_bits"
+set $(echo ${FILENAME} | sed 's/_/ /g')
+echo $4 $3 $2 $1
+bits into this split
+</pre>
+===Centre align text on a line in bash shell===
+Doesn't work in Korn shell due to %*s
+<pre>
+#COLUMNS=$(tput cols)   # width of the current window
+COLUMNS=80
+title="Hello world!"
+printf "%*s\n" $(((${#title}+$COLUMNS)/2)) "$title"
+</pre>
+and as a one-liner
+<pre>
+printf "%*s\n" $(( ( $(echo $* | wc -c ) + 80 ) / 2 )) "$*"
+</pre>
+This works in Korn shell...
+<pre>
+TITLE="$1"
+LINEWIDTH=80
+LPAD=$(((${#TITLE}+$LINEWIDTH)/2))
+printf %${LPAD}s "$TITLE"
+</pre>
+===Right justify text (or repeat characters) on a line with leader dots!===
+<pre>
+function rpadwait {
+    text=$1
+# -------------------------
+# suppress newline for echo
+# -------------------------
+N=
+C=
+if echo "\c" | grep c >/dev/null 2>&1; then
+    N='-n'
+else
+    C='\c'
 fi
-##
-## Program not given, try to guess a default
-##
+    echo ${N} "${text}${C}" | sed -e :a -e 's/^.\{1,80\}$/&\./;ta'
-if [ -z "$MOZ_PROGRAM" ]
+}
-then
+</pre>
-	##
-	## Try this script's name with '-bin' appended
+===cron jobs not submitted - daemon run out of child processes?===
-	##
+Sometimes have problems with NFS mounts and this causes cron jobs to hang. If they are scheduled to run regularly, eventually cron will no longer be able to start any more jobs.<br />
-	if [ -x "$MOZ_DEFAULT_NAME" ]
+* Check the cron log '''/var/adm/cron/log''' to see if there are any errors or other messages around the time the jobs should run.
-	then
+If cron has hit its process limit (default 100), it will try again after a number of seconds (default 60).<br />
-		MOZ_PROGRAM=$MOZ_DEFAULT_NAME
+Both the number of jobs and wait time are configured in the file '''/var/adm/cron/queuedefs'''. If it is unusual for cron to be running so many jobs, you can check the process table to view the jobs cron has created. These jobs will have parent process id (PPID) of the cron daemon.<br />
-	##
+<pre>
-	## Try mozilla-bin
+$ ps -ef | grep cron | grep -v grep
-	##
+    root  6750314        1   0   Apr 24      -  3:39 /usr/sbin/cron
-	elif [ -x "$MOZ_APPRUNNER_NAME" ]
+solax025:root[/home/root]# ps -T 6750314
-	then
+      PID    TTY  TIME CMD
-		MOZ_PROGRAM=$MOZ_APPRUNNER_NAME
+  6750314      -  3:39 cron
-	fi
+ 21168296      -  0:00     \--bsh
-fi
+ 58982414      -  0:00         \--sadc
-#
-#
-##
-## Make sure the program is executable
-##
-if [ ! -x "$MOZ_PROGRAM" ]
-then
-	moz_bail "Cannot execute $MOZ_PROGRAM."
-fi
-#
 </pre>
+In this example, we only have 1 job running
-===Carry XWindows settings across sessions===
+===Find long-running processes with a cron job===
+Processes running longer than 24 hours have a date instead of a start time...
 <pre>
-# ----------------------
+08,14 * * * /home/ibmtools/scripts/oracle/dosh -vc "ps -ef|grep 'ibmtools/scripts/oracle'|perl -nae 'print if \$F[4] !~/:/'" >/tmp/lrp.txt; [[ $(grep -c ibmtools /tmp/lrp.txt) -ne 0 ]] && cat /tmp/lrp.txt|mailx -s '*** long running processes - please check ***' [email protected]
-# push XWindows settings
+</pre>
-# ----------------------
-[[ "`uname`" == "SunOS" ]] && PATH=/usr/openwin/bin:$PATH
-WHOAMI=`id | awk -F')' '{print $1}' | awk -F'(' '{print $2}'`
-xauth list > /tmp/xauth_list_$WHOAMI
-chmod 777 /tmp/xauth_list_$WHOAMI
-echo $DISPLAY > /tmp/xdisplay_$WHOAMI
+===Process command line arguments in shell===
-chmod 777 /tmp/xdisplay_$WHOAMI
+Borrowed from Mozilla Firefox installer
-</pre>
-===Cross-platform version of whoami===
 <pre>
-WHOAMI=`id | awk -F')' '{print $1}' | awk -F'(' '{print $2}'`
+## Command line arg defaults
-</pre>
+##
-===Set terminal title from command line===
+moz_debug=0
-Put something like this in the .profile<br />
+moz_debugger=""
--n     do not output the trailing newline<br />
+moz_debugger_args=""
--e     enable interpretation of backslash escapes<br />
+#
-|0     sets title of window and icon<br />
+##
-|1     sets title of icon only<br />
+## Parse the command line
-|2     sets title of window only<br />
+##
-<pre>
+while [ $# -gt 0 ]
-echo -en "\033]0;`hostname`\007"
+do
-</pre>
+  case $1 in
-<pre>
+    -g | --debug)
-echo -en "\033]2;`hostname`\007"
+      moz_debug=1
-</pre>
+      shift
+      ;;
-===A decent Unix Prompt===
+     -d | --debugger)
-<pre>
+      moz_debugger=$2;
-export PS1="`uname -n`:`whoami`[\${PWD}]# "
+      if [ "${moz_debugger}" != "" ]; then
-or
+	shift 2
-export PS1='($?) $'ORACLE_SID" "`whoami`"@"`uname -n`":"'$'PWD"> "
+      else
-export EDITOR=vi
+        echo "-d requires an argument"
-</pre>
+        exit 1
-===Mount a website (or any other remote resource) locally using WebDav===
+      fi
-Redhat/CentOS
+      ;;
-<pre>
+    -a | --debugger-args)
-yum install fuse-davfs2
+      moz_debugger_args=$2;
-or
+      if [ "${moz_debugger_args}" != "" ]; then
-yum install wdfs.x86_64
+	shift 2
-</pre>
+      else
-Debian
+        echo "-a requires an argument"
-<pre>
+        exit 1
-apt-get install davfs2
+      fi
-</pre>
+      ;;
-then...
+    *)
-<pre>
+      break;
-sudo mkdir /mnt/webdav  # or whatever you'd like to call the directory
+      ;;
-sudo mount.davfs [-o option[,option]...] device mount_point
+  esac
-</pre>
+done
-In man's terms, that last line would translate to:
+#
-<pre>
+##
-id  #suppose this returns uid=501 and gid=502
+## Program name given in $1
-sudo mount.davfs -o 501,502 https://your/web/site /mnt/webdav
+##
-</pre>
+if [ $# -gt 0 ]
-Mac OSX
+then
-<pre>
+	MOZ_PROGRAM=$1
-osascript -e ' mount volume "http://username:[email protected]:portnum" '
+	shift
-or
+fi
-osascript -e ' mount volume "http://[email protected]:portnum" '
+##
-or
+## Program not given, try to guess a default
-osascript -e ' try mount volume "http://webdav.address:portnum" '
+##
-or
+if [ -z "$MOZ_PROGRAM" ]
-mount -t webdav http://webdav.address:portnum /mnt/webdav  # this one won't show up in the Finder Sidebar.
+then
-</pre>
+	##
+	## Try this script's name with '-bin' appended
-===Add current hostname to list of hosts on an xcat server===
+	##
-<pre>
+	if [ -x "$MOZ_DEFAULT_NAME" ]
-CMD="nodels"
+	then
-HOST=`hostname`
+		MOZ_PROGRAM=$MOZ_DEFAULT_NAME
-(echo "$HOST"; $CMD) | while read server
+	##
-do
+	## Try mozilla-bin
-    echo "server:$server"
+	##
-done
+	elif [ -x "$MOZ_APPRUNNER_NAME" ]
-</pre>
+	then
-===What is todays 'Day Of the Year' number?===
+		MOZ_PROGRAM=$MOZ_APPRUNNER_NAME
-<pre>
+	fi
-DOY=`perl -e 'print sub{$_[7]}->(localtime)+1;'`
+fi
+#
+#
+##
+## Make sure the program is executable
+##
+if [ ! -x "$MOZ_PROGRAM" ]
+then
+	moz_bail "Cannot execute $MOZ_PROGRAM."
+fi
+#
 </pre>
-===Convert Julian day numbers to dates===
+===Carry XWindows settings across sessions===
 <pre>
-for day in 8 33 36 61 64 91 96 121 126 152 155 182 187 215 218 244 247 274 279 306 309 335 338 365; do date -d "`date +%Y`-01-01 +$(( ${day} - 1 ))days" +%d-%m-%Y; done
+# ----------------------
+# push XWindows settings
+# ----------------------
+[[ "$(uname)" == "SunOS" ]] && PATH=/usr/openwin/bin:$PATH
+WHOAMI=$(id | awk -F')' '{print $1}' | awk -F'(' '{print $2}')
+xauth list > /tmp/xauth_list_$WHOAMI
+chmod 777 /tmp/xauth_list_$WHOAMI
+echo $DISPLAY > /tmp/xdisplay_$WHOAMI
+chmod 777 /tmp/xdisplay_$WHOAMI
 </pre>
-===Edit crontab file without crontab -e===
-It can happen that you need to add or modify a line in the crontab of many users or across many servers at once.<br />
+===Cross-platform version of whoami===
-In principle, there's nothing wrong with modifying the crontab file directly. You just lose the advantages of file locking (and syntax checking) that crontab -e offers.<br />
-Here we take a backup of the current crontab, print it out, echo an extra command and ask cron to use these as input (thus overwriting the existing crontab file). Just don't run this close to midnight :-)
 <pre>
-crontab -l > /tmp/crontab.`date +'%Y%m%d'`
+WHOAMI=$(id | awk -F')' '{print $1}' | awk -F'(' '{print $2}')
-(
-cat /tmp/crontab.`date +'%Y%m%d'`
-echo "02 10 * * * /home/ibmtools/scripts/oracle/export_parfile.ksh -s SID -f JDBEOP1.parfile"
-) | crontab -
 </pre>
-or
+===Set terminal title from command line===
+Put something like this in the .profile<br />
+-n     do not output the trailing newline<br />
+-e     enable interpretation of backslash escapes<br />
+|0     sets title of window and icon<br />
+|1     sets title of icon only<br />
+|2     sets title of window only<br />
 <pre>
-crontab -l > /tmp/crontab.backup
+echo -en "\033]0;`hostname`\007"
-crontab -l > /tmp/crontab.$$
-perl -p -i -e 's!backup_send_tsm_dump!backup_export2tsm!g' /tmp/crontab.$$
-crontab /tmp/crontab.$$
-rm /tmp/crontab.$$
 </pre>
-===Check for jobs running longer that 24 hours===
-Run from the management server across all Unix servers. Checks the 5th column in a ps listing. If it doesn't find a : (time separator), the process is running longer than 24 hours.
 <pre>
-# ---------------------------------------
+echo -en "\033]2;`hostname`\007"
-# report on long running oraibm processes
-# ---------------------------------------
-* 08,14 * * * /home/ibmtools/scripts/oracle/dosh -vc "ps -ef | grep oraibm | perl -nae 'print if \$F[4] !~/:/'">/tmp/lrj.log; [[ `grep -c oraibm /tmp/lrj.log` -gt 0 ]] && cat /tmp/lrj.log | mailx -s '*** please check ***' oradbdc
-#
 </pre>
-===Global find and replace with perl (restricted to list of files provided by Unix find command)===
+===Remove blank lines and comments (also indented ones) from a file===
+<pre>
+awk -F\: '!/^($|[:space:]*#)/ {print $2}' /etc/oratab | sort | uniq
+</pre>
+or as part of a script that removes comments and blank lines from all Korn shell scripts in a directory
 <pre>
-find . -type f -exec perl -i -pe 's/something/else/g' {} \;
+#!/usr/bin/ksh
+for i in $(ls *ksh); do
+    perl -p -i -e 's/^\s*#[^!]*$//; s/^\s*$//' $i
+done
 </pre>
-===perl function to make filenames lower case===
+===Return elements of an array in Korn shell===
+From [http://unix.stackexchange.com/questions/188202/processing-output-from-an-sqlite-db-into-a-ksh-array-with-spaces here]<br />
+Could be used to separate the columns of an SQL select when returning to the shell<br />
+This approach eliminates the need to put quotes around text with spaces in it.
 <pre>
-function lower {
+echo $KSH_VERSION
-   perl -e 'for (@ARGV) { rename $_, lc($_) unless -e lc($_); }' *
+x="Red,Yellow is a color,Blue"
-}
+oIFS=$IFS
+IFS=,
+y=($x)
+IFS=$oIFS
+echo ${y[1]}
 </pre>
-===From the management server, search the tns listener port for each database on a server and make an inline substitution in a ITM config files!===
+===A decent Unix Prompt===
 <pre>
-for i in `/home/ibmtools/scripts/oracle/dosh -c "ls -al /opt/IBM/ITM/config/*rz*cfg|grep -v lrwx"|awk '{print $NF}'`; do
+export PS1="`uname -n`:`whoami`[\${PWD}]# "
-    server=`echo $i|cut -d_ -f1 | awk -F'/' '{print $NF}'`
+or
-    db=`echo $i|cut -d'.' -f1 | awk -F'_' '{print $NF}'`
+export PS1='($?) $'ORACLE_SID" "`whoami`"@"`uname -n`":"'$'PWD"> "
-    OH=`ssh $server grep "^$db" /etc/oratab|cut -d: -f2`
+export EDITOR=vi
-    LISTENERPORT=`ssh $server cat $OH/network/admin/listener.ora|perl -00 -ne 'print $1 if /'$db'.*PORT.*=.*(\d{4})/s'`
+</pre>
-     ssh $server perl -p -i.bak -e 's/1521/'$LISTENERPORT'/' $i
+===Simple arithmetic===
-     ssh $server ls -al ${i}*
+pipe the calculation into the shell calculator
-done
+<pre>
+space_in_kb=$(echo $1 / 1024 | bc)
+</pre>
+Calculate the remainder (modulo) of a division calculation
+<pre>
+if [[ $(echo "${NUMBER} % 2" | bc) -eq 0 ]]; then
+     echo "${NUMBER} is even"
+else
+     echo "${NUMBER} is odd"
+fi
 </pre>
-===Run a job from cron every Nth day of the month===
+or do it in awk if scientific notation maybe involved
-Example. Execute a job every third Saturday of the month.<br />
-Paste this into a file called calenday and put it in /usr/local/bin so it's (probably) on the PATH
 <pre>
-#!/usr/bin/ksh
+function calc { awk "BEGIN{print $*}"; }
-# ix is the week number of the month ("2"nd Friday of the month, "3"rd Tuesday of the month)
+if [[ $(calc "${SPACE_USED} + ${SPACE_AVAILABLE} - ${DATABASE_SIZE") -le 0 ]]; then
-# dy is the day number in Unix format (0 for Sunday, 1 for Monday, ... 6 for Saturday)
+    echo "NOK"
-# eg. "calenday 3 6" returns the date of 3rd Saturday of the month.
+fi
+</pre>
-ix=$1
+===Script encryption and passphrase protection===
-dy=$2
+Encrypt a shell script with the ability to execute the encrypted version
-SCHAR=$((($dy*2)+$dy+1))
+* from [http://www.commandlinefu.com/commands/browse commandlinefu.com]
-ECHAR=$(($SCHAR+1))
-cal `date '+%m %Y'` | egrep "\<[0-9]{1,2}\>" | cut -c${SCHAR}-${ECHAR} | xargs | awk {'print $'$ix'}'
-</pre>
-Now in crontab, you should be able to do something like this:<br />
 <pre>
-20 * * * [[ `calenday 3 6` -eq `/bin/date '+%d'` ]] && su - oracle -c "run_my_backup.ksh"
+scrypt(){ [ -n "$1" ]&&{ echo '. <(echo "$(tail -n+2 $0|base64 -d|mcrypt -dq)"); exit;'>$1.scrypt;cat $1|mcrypt|base64 >>$1.scrypt;chmod +x $1.scrypt;};}
 </pre>
-This will also work on some Unices..<br />
+===Virtual host configuration in Apache http.conf===
-We send backups to a special TSM node on the second Friday of each month. This report must run a day later - but that is not guaranteed to be the second Saturday or even the 3rd. So...
 <pre>
-12 8-14 * 5 sleep 86400 && su - oracle -c "/usr/bin/perl -ne 'print if /ORX_M_SOL/ .. /^STOP/' /home/oracle/incoming/dbamon_spool_tsm_*.SOL | grep Archive | grep -v Client | mailx -s 'Monthly TSM backups' [email protected]"
+<VirtualHost *:80>
+        ServerName dbamon
+        DocumentRoot "/Volumes/data/Sites/dbamon_push"
+        <Directory "/Volumes/data/Sites/dbamon_push">
+                Options Includes FollowSymLinks
+                AllowOverride All
+                Order allow,deny
+                Allow from all
+        </Directory>
+</VirtualHost>
 </pre>
+and in /etc/hosts, add...
-===ps -ef cuts off args cmd column on Solaris===
-On AIX, ps eww <PID> shows the full argument listing of a process (NOTE: no - sign!)<br />
-To see more than 80 characters of the last column on Solaris:
 <pre>
-pargs <PID>
+.0.0.1  dbamon
 </pre>
-shows all the individual arguments to the command
+===Mount a website (or any other remote resource) locally using WebDav===
+Redhat/CentOS
 <pre>
-/usr/ucb/ps auww
+yum install fuse-davfs2
+or
+yum install wdfs.x86_64
 </pre>
-shows the ps listing in 'compatibility' mode (there are more compatibility commands in /usr/xpg4/bin)
+Debian
-===Remove blank lines fom vi===
-Maybe you cut and pasted a file from Windows and it's full of blank lines and Control-M's now<br />
-There are several methods but I think this is the easiest to remember
 <pre>
-:g/^$/d
+apt-get install davfs2
 </pre>
-===Right pad a variable===
+then...
-a function like rpad in SQL but for Shell<br />
 <pre>
-function rpad {
+sudo mkdir /mnt/webdav  # or whatever you'd like to call the directory
-text=$1
+sudo mount.davfs [-o option[,option]...] device mount_point
-padwidth=$2
+</pre>
-padchar=$3
+In man's terms, that last line would translate to:
-echo "$text" | sed -e :a -e 's/^.\{1,'$padwidth'\}$/&\'$padchar'/;ta'
+<pre>
-}
+id  #suppose this returns uid=501 and gid=502
+sudo mount.davfs -o 501,502 https://your/web/site /mnt/webdav
 </pre>
+Mac OSX
-===Connect to a Windows server from Linux using rdesktop===
-My remmina stopped working so rolled my own. Very simple really. Put this is a shell.
 <pre>
-tsocks rdesktop -z -P -x m -a 16 -d MAIND -u sbarkley -p ****** -r disk:SOL=$HOME/Documents/SOL -g 95% 150.251.112.38 &
+osascript -e ' mount volume "http://username:[email protected]:portnum" '
+or
+osascript -e ' mount volume "http://[email protected]:portnum" '
+or
+osascript -e ' try mount volume "http://webdav.address:portnum" '
+or
+mount -t webdav http://webdav.address:portnum /mnt/webdav  # this one won't show up in the Finder Sidebar.
+</pre>
-where...
+===Add current hostname to list of hosts on an xcat server===
--z    - enables compression
--P    - enables bitmap caching (saves network traffic)
--x m  - disables eye-candy features
--a 16 - reduce colour pallete to 16 colours
--d    - domain to connect to
--u    - username
--p    - password
--r    - setup a shared folder
--g    - geometry (use W x H or percentage)
-</pre>
-===Reset your password bypassing password rules===
-must be done as root
 <pre>
-echo "user:new_password" | chpasswd
+CMD="nodels"
+HOST=`hostname`
+(echo "$HOST"; $CMD) | while read server
+do
+    echo "server:$server"
+done
 </pre>
-===Sum the sizes of all files of an ls listing===
+===What is todays 'Day Of the Year' number?===
-It'll check to see if the sum of filesizes corresponds with the df -g (or h) listing (can get messed up due to open but deleted files)
 <pre>
-cd /oracle/export
+DOY=`perl -e 'print sub{$_[7]}->(localtime)+1;'`
-df -g .
-find . -name "*dmp*" -ls |  awk '{ SUM += $7} END { print SUM/1024/1024/1024 }'
 </pre>
-===Mount an iso image under Linux===
+===Convert Julian day numbers to dates===
 <pre>
-mkdir -p /mnt/cdrom
+for day in 8 33 36 61 64 91 96 121 126 152 155 182 187 215 218 244 247 274 279 306 309 335 338 365; do date -d "`date +%Y`-01-01 +$(( ${day} - 1 ))days" +%d-%m-%Y; done
-mount -o loop /dev/cdrom /mnt/cdrom
 </pre>
-===How many processors on the machine?===
+===Send crontab job output to a date formatted log file===
-* AIX
+This will run a job every 5 minutes and send the output to a file ending with a time in hours and minutes.<br />
+The thing to note is the escaped percent signs. This is because a % sign is interpreted by cron to mean a newline character. Everything after the first % is treated as input to the program.
 <pre>
-lsdev -C|grep Process|wc -l
+*/5 *  * * * /var/www/cgi-bin/dbamon_collector.ksh       >/tmp/dbamon_collector.log.$(date "+\%H\%M") 2>&1
 </pre>
-* Solaris
+===Edit crontab file without crontab -e===
+It can happen that you need to add or modify a line in the crontab of many users or across many servers at once.<br />
+In principle, there's nothing wrong with modifying the crontab file directly. You just lose the advantages of file locking (and syntax checking) that crontab -e offers.<br />
+Here we take a backup of the current crontab, print it out, echo an extra command and ask cron to use these as input (thus overwriting the existing crontab file). Just don't run this close to midnight :-)
 <pre>
-psrinfo -v|grep "Status of processor"|wc -l
+crontab -l > /tmp/crontab.`date '+%Y%m%d'`
+(
+cat /tmp/crontab.`date +'%Y%m%d'`
+echo "02 10 * * * /home/ibmtools/scripts/oracle/export_parfile.ksh -s SID -f JDBEOP1.parfile"
+) | crontab -
 </pre>
-* Linux
+or
 <pre>
-cat /proc/cpuinfo|grep processor|wc -l
+crontab -l > /tmp/crontab.backup
+crontab -l > /tmp/crontab.$$
+perl -p -i -e 's!backup_send_tsm_dump!backup_export2tsm!g' /tmp/crontab.$$
+crontab /tmp/crontab.$$
+rm /tmp/crontab.$$
+</pre>
+or
+<pre>
+crontab -l >$HOME/crontab.$(date '+%Y%m%d')
+crontab -l | perl -p -e 's|/nas/software/oracle/scripts|/oracle/scripts|' | crontab
 </pre>
-===Quick, simple, understandable example of how to use RRDTool===
+===Use shell to convert a number in scientific notation to normal===
-* [[RRDTool]]
-===Use expect to respond automatically to interactive programs===
 <pre>
-#!/usr/bin/expect -f
+var2convert='1.2345678e3'
-spawn /usr/tivoli/tsm/client/oracle/bin64/tdpoconf passw -tdpo_optfile=/oracle/[lindex $argv 0]/admin/tdpo.opt
+printf -v var2convert "%.f" $var2convert
-expect "assword:" {send "password\r"}
+echo $var2convert  # magic!
-expect "assword:" {send "password\r"}
-expect "assword:" {send "password\r"}
 </pre>
-===Within a shell script set up simultaneous output to both terminal and a file using a FIFO (named pipes)===
+===Check for jobs running longer that 24 hours===
-examples [http://www.unix.com/shell-programming-and-scripting/85584-redirect-within-ksh.html here on unix.com]
+Run from the management server across all Unix servers. Checks the 5th column in a ps listing. If it doesn't find a : (time separator), the process is running longer than 24 hours.
-* general info on redirections [http://www.catonmat.net/blog/bash-one-liners-explained-part-three/ here at catonmat.net]
 <pre>
-#!/bin/ksh
+# ---------------------------------------
+# report on long running oraibm processes
+# ---------------------------------------
+17,14 * * * rm -f /tmp/lrp.txt;/home/ibmtools/scripts/oracle/dosh -vc \"ps -ef|egrep 'oraibm|scripts/oracle'>/tmp/lrp.txt;perl -nae 'print if \$F[4] !~/:/' /tmp/lrp.txt\" >>/tmp/lrp.txt;[[ $(egrep -c 'oraibm|scripts/or
+acle' /tmp/lrp.txt) -ne 0 ]] && cat /tmp/lrp.txt|mailx -s '*** long running processes - please check ***' [email protected]
+</pre>
-REDIR=test.redir
+===Global find and replace with perl (restricted to list of files provided by Unix find command)===
-FIFO=test.pipe
+<pre>
-[[ -e $FIFO ]] || mkfifo $FIFO
+find . -type f -exec perl -i -pe 's/something/else/g' {} \;
+</pre>
+===perl function to make filenames lower case===
+<pre>
+function lower {
+   perl -e 'for (@ARGV) { rename $_, lc($_) unless -e lc($_); }' *
+}
+</pre>
-# make a new channel(3) and copy channel 1's destination as its own (does NOT POINT TO channel 1's destination)
+===From the management server, search the TNS listener port for each database on a server and make an inline substitution in the ITM config files!===
-# this allows the normal output to continue to STDOUT but also get printed to whatever file is attached to channel 3
+<pre>
-exec 3>&1
+for i in `/home/ibmtools/scripts/oracle/dosh -c "ls -al /opt/IBM/ITM/config/*rz*cfg|grep -v lrwx"|awk '{print $NF}'`; do
+    server=`echo $i|cut -d_ -f1 | awk -F'/' '{print $NF}'`
+    db=`echo $i|cut -d'.' -f1 | awk -F'_' '{print $NF}'`
+    OH=`ssh $server grep "^$db" /etc/oratab|cut -d: -f2`
+    LISTENERPORT=`ssh $server cat $OH/network/admin/listener.ora|perl -00 -ne 'print $1 if /'$db'.*PORT.*=.*(\d{4})/s'`
+    ssh $server perl -p -i.bak -e 's/1521/'$LISTENERPORT'/' $i
+    ssh $server ls -al ${i}*
+done
+</pre>
-# anything coming in on the pipe, send it to $REDIR and to channel 3
+===Run a job from cron every Nth day of the month===
-tee $REDIR <$FIFO >&3 &
+Example. Execute a job every third Saturday of the month.<br />
+Paste this into a file called calenday and put it in /usr/local/bin so it's (probably) on the PATH
+<pre>
+#!/usr/bin/ksh
-# redirect STDOUT to the pipe
+# ix is the week number of the month ("2"nd Friday of the month, "3"rd Tuesday of the month)
-exec > $FIFO
+# dy is the day number in Unix format (0 for Sunday, 1 for Monday, ... 6 for Saturday)
+# eg. "calenday 3 6" returns the date of 3rd Saturday of the month.
+ix=$1
+dy=$2
+SCHAR=$((($dy*2)+$dy+1))
+ECHAR=$(($SCHAR+1))
+cal `date '+%m %Y'` | egrep "\<[0-9]{1,2}\>" | cut -c${SCHAR}-${ECHAR} | xargs | awk {'print $'$ix'}'
-echo "going to default output"
-echo "forcing to channel 1" >&1
-echo "forcing to channel 2" >&2
-echo "forcing to channel 3" >&3
 </pre>
-====More elaborate example====
+Now in crontab, you should be able to do something like this:<br />
-found [http://stackoverflow.com/questions/2288939/create-a-pipe-that-writes-to-multiple-files-tee here on stackoverflow]
 <pre>
-#!/bin/sh
+20 * * * [[ `calenday 3 6` -eq `/bin/date '+%d'` ]] && su - oracle -c "run_my_backup.ksh"
+</pre>
-# Author: Harvey Chapman <hchapman _AT_ 3gfp.com>
+This will also work on some Unices..<br />
-# Description: POSIX shell functions that can be used with tee to simultaneously put
+We send backups to a special TSM node on the second Friday of each month. This report must run a day later - but that is not guaranteed to be the second Saturday or even the 3rd. So...
-#              stderr and stdout to both a file and stdout
+<pre>
-#
+12 8-14 * 5 sleep 86400 && su - oracle -c "/usr/bin/perl -ne 'print if /ORX_M_SOL/ .. /^STOP/' /home/oracle/incoming/dbamon_spool_tsm_*.SOL | grep Archive | grep -v Client | mailx -s 'Monthly TSM backups' [email protected]"
-# Based on:
+</pre>
-#    Re: How to redirect stderr and stdout to a file plus display at the same time
-#    http://www.travishartwell.net/blog/2006/08/19_2220
-#
+===ps listing does not show start time after 24 hours===
-# Original example function from Travis Hartwell's blog.
+But you can see elapsed time using your own ps command
-# Note: I've made minor changes to it.
+<pre>
-example()
+/usr/bin/ps -eo etime,user,pid,ppid,cpu,start,tty,time,args|tail -n +2|sort
-{
+</pre>
-  OUTPUT_LOG=output.log
-  OUTPUT_PIPE=output.pipe
-  # This should really be -p to test that it's a pipe.
+===ps -ef cuts off args cmd column on Solaris===
-  if [ ! -e $OUTPUT_PIPE ]; then
+====To see more than 80 characters of the last column on Solaris====
-      mkfifo $OUTPUT_PIPE
+This shows all the individual arguments to the command
-  fi
+<pre>
+pargs <pid>
+</pre>
+This shows the ps listing in 'compatibility' mode (there are more compatibility commands in /usr/xpg4/bin)
+<pre>
+/usr/ucb/ps auww
+</pre>
+====To see more than 80 characters of the last column on AIX====
+This shows the full argument listing of a process (NOTE: no minus sign!)
+<pre>
+ps eww <pid>
+</pre>
-  # This should really be -f to test that it's a regular file.
+===Remove blank / empty lines from vi ===
-  if [ -e $OUTPUT_LOG ]; then
+Maybe you cut and pasted a file from Windows and it's full of blank lines and Control-M's now<br />
-      rm $OUTPUT_LOG
+There are several methods but I think this is the easiest to remember
-  fi
+<pre>
+:g/^$/d
+</pre>
-  exec 3>&1 4>&2
+===Right pad a variable===
-  tee $OUTPUT_LOG < $OUTPUT_PIPE >&3 &
+a function like rpad in SQL but for Shell<br />
-  tpid=$!
+<pre>
-  exec > $OUTPUT_PIPE 2>&1
+function rpad {
+text=$1
+padwidth=$2
+padchar=$3
+echo "$text" | sed -e :a -e 's/^.\{1,'$padwidth'\}$/&\'$padchar'/;ta'
+}
+</pre>
-  echo "This is on standard out"
+===Connect to a Windows server from Linux using rdesktop===
-  echo "This is on standard err" >&2
+My remmina stopped working so rolled my own. Very simple really. Put this is a shell.
+<pre>
+tsocks rdesktop -z -P -x m -a 16 -d MAIND -u sbarkley -p ****** -r disk:SOL=$HOME/Documents/SOL -g 95% 150.251.112.38 &
-  exec 1>&3 3>&- 2>&4 4>&-
+where...
-  wait $tpid
+-z    - enables compression
+-P    - enables bitmap caching (saves network traffic)
+-x m  - disables eye-candy features
+-a 16 - reduce colour pallete to 16 colours
+-d    - domain to connect to
+-u    - username
+-p    - password
+-r    - setup a shared folder
+-g    - geometry (use W x H or percentage)
+</pre>
+Slight problems with rdesktop not working 100% of the time. Now using xfreerdp. Seems better...
+<pre>
+xfreerdp -g 90% --ignore-certificate --gdi sw -K -d wdcrhbp05 -u oraibm -p "`cat $HOME/scripts/.oraibm.password`" -T "wdcrhbp05_oraibm" --plugin cliprdr --plugin rdpdr --data disk:SOL:/home/bey9at77/Documents/SOL -- --plugin rdpsnd --data alsa -- 150.251.112.25 &
+</pre>
-  rm $OUTPUT_PIPE
+===Reset your password bypassing password rules===
-}
+must be done as root
+<pre>
-# A slightly reduced version of example()
+echo "user:new_password" | chpasswd
-example2()
+</pre>
-{
+===Sum the sizes of all files of an ls listing===
-  OUTPUT_LOG=output.log
+It'll check to see if the sum of filesizes corresponds with the df -g (or h) listing (can get messed up due to open but deleted files)
-  OUTPUT_PIPE=output.pipe
+<pre>
+cd /oracle/export
+df -g .
+find . -name "*dmp*" -ls |  awk '{ SUM += $7} END { print SUM/1024/1024/1024 }'
+</pre>
-  rm -f $OUTPUT_PIPE
+===Mount an iso image under Linux===
-  mkfifo $OUTPUT_PIPE
+<pre>
-  rm -f $OUTPUT_LOG
+mkdir -p /mnt/cdrom
+mount -o loop /dev/cdrom /mnt/cdrom
-  tee $OUTPUT_LOG < $OUTPUT_PIPE &
+</pre>
-  tpid=$!
+===How many processors on the machine?===
+* AIX
-  exec 3>&1 4>&2 >$OUTPUT_PIPE 2>&1
+<pre>
+lsdev -C|grep Process|wc -l
-  echo "This is on standard out"
+</pre>
-  echo "This is on standard err" >&2
+* Solaris
+<pre>
+psrinfo -v|grep "Status of processor"|wc -l
+</pre>
+* Linux
+<pre>
+cat /proc/cpuinfo|grep processor|wc -l
+</pre>
-  exec 1>&3 3>&- 2>&4 4>&-
+===Quick, simple, understandable example of how to use RRDTool===
-  wait $tpid
+* [[RRDTool]]
-  rm -f $OUTPUT_PIPE
-}
-#
+===Use expect to respond automatically to interactive programs===
-# Logging methods based on above. See the example below for how to use them.
+<pre>
-#
+#!/usr/bin/expect -f
+spawn /usr/tivoli/tsm/client/oracle/bin64/tdpoconf passw -tdpo_optfile=/oracle/[lindex $argv 0]/admin/tdpo.opt
-# Usage: start_logging [delete_existing_logfile]
+expect "assword:" {send "password\r"}
-start_logging()
+expect "assword:" {send "password\r"}
-{
+expect "assword:" {send "password\r"}
-  # Check to see if OUTPUT_LOG and OUTPUT_PIPE need to be defined.
+</pre>
-  if [ -z "$OUTPUT_LOG" ]; then
+===Use expect to allow file copy with scp (if ssh keys are not an option)===
-    OUTPUT_LOG=output.log
+<pre>
-  fi
+#!/usr/bin/expect -f
-  if [ -z "$OUTPUT_PIPE" ]; then
+spawn scp /home/oracle/.profile oracle@hn512:/tmp/prfl
-    OUTPUT_PIPE=output.pipe
+set pass "thepassword"
-  fi
+expect {
-  # Make sure that we're not already logging.
+        password: {send "$pass\r" ; exp_continue}
-  if [ -n "$OUTPUT_PID" ]; then
+        eof exit
-    echo "Logging already started!"
+}
-    return 1
+</pre>
-  fi
-  # Always remove the log and pipe first.
+===Within a shell script set up simultaneous output to both terminal and a file using a FIFO (named pipes)===
-  rm -f $OUTPUT_PIPE
+or "How to send shell output to screen/stdout as well as to a logfile using tee and redirection with exec"<br />
-  # Delete the logfile first if told to.
+<br />
-  if [ "$1" = delete_existing_logfile ]; then
+examples [http://www.unix.com/shell-programming-and-scripting/85584-redirect-within-ksh.html here on unix.com]
-    rm -f $OUTPUT_LOG
+* general info on redirections [http://www.catonmat.net/blog/bash-one-liners-explained-part-three/ here at catonmat.net]
-  fi
+<pre>
+#!/bin/ksh
+REDIR=test.redir
+FIFO=test.pipe
+[[ -e $FIFO ]] || mkfifo $FIFO
+# make a new channel(3) and copy channel 1's destination as its own (does NOT POINT TO channel 1's destination)
+# this allows the normal output to continue to STDOUT but also get printed to whatever file is attached to channel 3
+exec 3>&1
-  mkfifo $OUTPUT_PIPE
+# anything coming in on the pipe, send it to $REDIR and to channel 3
-  tee -a $OUTPUT_LOG < $OUTPUT_PIPE &
+tee $REDIR <$FIFO >&3 &
-  OUTPUT_PID=$!
-  exec 3>&1 4>&2 >$OUTPUT_PIPE 2>&1
+# redirect STDOUT to the pipe
-}
+exec > $FIFO
-stop_logging()
+echo "going to default output"
-{
+echo "forcing to channel 1" >&1
-  # Make sure that we're currently logging.
+echo "forcing to channel 2" >&2
-  if [ -z "$OUTPUT_PID" ]; then
+echo "forcing to channel 3" >&3
-    echo "Logging not yet started!"
-    return 1
-  fi
-  exec 1>&3 3>&- 2>&4 4>&-
-  wait $OUTPUT_PID
-  rm -f $OUTPUT_PIPE
-  unset OUTPUT_PID
-}
-example3()
-{
-  start_logging
-  #start_logging delete_existing_logfile
-  echo "This is on standard out"
-  echo "This is on standard err" >&2
-  stop_logging
-}
 </pre>
+====More elaborate example====
+found [http://stackoverflow.com/questions/2288939/create-a-pipe-that-writes-to-multiple-files-tee here on stackoverflow]
+<pre>
+#!/bin/sh
-===RedHat root filesystem has gone read-only===
+# Author: Harvey Chapman <hchapman _AT_ 3gfp.com>
-* [http://www.unixarena.com/2013/09/redhat-linux-how-to-fix-read-only-root.html How to fix read only root file system]
+# Description: POSIX shell functions that can be used with tee to simultaneously put
+#              stderr and stdout to both a file and stdout
+#
+# Based on:
+#    Re: How to redirect stderr and stdout to a file plus display at the same time
+#    http://www.travishartwell.net/blog/2006/08/19_2220
-===Kill all processes for a user===
+#
-<pre>
+# Original example function from Travis Hartwell's blog.
-for prc in `ps -ef | grep -E "^ +[o]racle" | awk '{print $2}'`; do
+# Note: I've made minor changes to it.
-    kill $prc
+example()
-done
+{
-</pre>
+  OUTPUT_LOG=output.log
+  OUTPUT_PIPE=output.pipe
-===isRGHere===
+  # This should really be -p to test that it's a pipe.
-Checks if resource group is on this leg of an HACMP cluster. Returns 0 if true else 1.
+  if [ ! -e $OUTPUT_PIPE ]; then
-<pre>
+      mkfifo $OUTPUT_PIPE
-#!/usr/bin/ksh
+  fi
-SCRIPT=`basename $0`
+  # This should really be -f to test that it's a regular file.
+  if [ -e $OUTPUT_LOG ]; then
+      rm $OUTPUT_LOG
+  fi
+  exec 3>&1 4>&2
+  tee $OUTPUT_LOG < $OUTPUT_PIPE >&3 &
+  tpid=$!
+  exec > $OUTPUT_PIPE 2>&1
-function rctest
+  echo "This is on standard out"
-{
+  echo "This is on standard err" >&2
-exitcode=$1
-msg=$2
-if [ $exitcode -ne 0 ]; then
-        echo "********************************************************************************"
-        echo "\nScript $SCRIPT finished with errors."
-        echo "$msg."
-        echo "Returncode : $exitcode."
-        echo "\n********************************************************************************"
-        fi
+  exec 1>&3 3>&- 2>&4 4>&-
-exit $exitcode
+  wait $tpid
+  rm $OUTPUT_PIPE
 }
-RGINFO=/usr/es/sbin/cluster/utilities/clRGinfo
+# A slightly reduced version of example()
-[[ ! -f $RGINFO ]] &&  rctest 1 "clRGinfo not found"
+example2()
+{
+  OUTPUT_LOG=output.log
+  OUTPUT_PIPE=output.pipe
+  rm -f $OUTPUT_PIPE
+  mkfifo $OUTPUT_PIPE
+  rm -f $OUTPUT_LOG
-if [ $# -eq 1 ]
+  tee $OUTPUT_LOG < $OUTPUT_PIPE &
-then
+  tpid=$!
-        RG=`echo $1 | cut -c 1-14`
-else
-        rctest 10  "Usage: `basename $0` <RG name>"
-fi
-$RGINFO |grep -qwp $RG ||  rctest 9 "$RG is not defined"
+  exec 3>&1 4>&2 >$OUTPUT_PIPE 2>&1
-THISNODE=`/usr/es/sbin/cluster/utilities/get_local_nodename | cut -c 1-14`
+  echo "This is on standard out"
-$RGINFO |grep -wp $RG |grep -w $THISNODE |grep -wq ONLINE
+  echo "This is on standard err" >&2
-</pre>
-===grep -p (for paragraph) works on AIX but not on Linux or Solaris===
+  exec 1>&3 3>&- 2>&4 4>&-
-Use awk instead
+  wait $tpid
-<pre>
+  rm -f $OUTPUT_PIPE
-awk 'BEGIN {FS="\n" RS="\n\n"} /search pattern/ { do something }' <file>
+}
-/usr/xpg4/bin/awk 'BEGIN {RS="\n\n";FS="\n"} /AGRHDWQ1/ {print $2}' dsm.sys | awk '{print $NF}'
-</pre>
-this prints the last word of the second ''line'' in the paragraph in dsm.sys that contains the search term AGRHDWQ1.<br />
-Or slightly simpler...
-<pre>
-awk -v RS='' '/NHAPPLP1/' /etc/tsm/dsm.sys     # (use /usr/xpg4/bin/awk on Solaris)
-</pre>
-or, case insensitively:
-<pre>
-awk -v RS='' 'tolower($0) ~/so_u_clubqa_orx_d_cab/' /etc/tsm/dsm.sys
-</pre>
-Using -v means you don't have to use a BEGIN section.
-===debug/redirect log of a shell===
+#
-<pre>
+# Logging methods based on above. See the example below for how to use them.
-#!/usr/bin/ksh
+#
-exec 2>/tmp/mytest
-</pre>
+# Usage: start_logging [delete_existing_logfile]
-===Different ways of Iteration in korn shell with a while loop===
+start_logging()
-<pre>
+{
-IFS="|"
+  # Check to see if OUTPUT_LOG and OUTPUT_PIPE need to be defined.
-exec 0<$statfile
+  if [ -z "$OUTPUT_LOG" ]; then
-while read host db started stopped
+     OUTPUT_LOG=output.log
-do
+  fi
-    rrdfile="export_duration_${host}_${db}.rrd"
+  if [ -z "$OUTPUT_PIPE" ]; then
-     $RRDTOOL update ${RRDDIR}/${rrdfile} $started:$started $stopped
+    OUTPUT_PIPE=output.pipe
-done
+  fi
-</pre>
+  # Make sure that we're not already logging.
-or
+  if [ -n "$OUTPUT_PID" ]; then
-<pre>
+    echo "Logging already started!"
-while read host db started stopped
+     return 1
-do
+  fi
-    rrdfile="export_duration_${host}_${db}.rrd"
-    $RRDTOOL update ${RRDDIR}/${rrdfile} $started:$started $stopped
-done <statfile
-</pre>
-or
-<pre>
-    cat $statfile | sort -nk4 | while IFS=\| read host db type started stopped
-    do
-        [[ "$stopped" == "" ]] && continue
-        rrdfile="export_duration_${host}_${db}.rrd"
-        $RRDTOOL update ${RRDDIR}/${rrdfile} ${started}:${started}:${stopped}
-        [[ $? -ne 0 ]] && echo "nok: $?"
-     done
-</pre>
-===Filesystem 100% full, what's taking up all the space?===
+  # Always remove the log and pipe first.
-<pre>
+  rm -f $OUTPUT_PIPE
-find /oracle/endur -xdev -ls|sort -nr +6|head
+  # Delete the logfile first if told to.
-</pre>
+  if [ "$1" = delete_existing_logfile ]; then
-or
+    rm -f $OUTPUT_LOG
-<pre>
+  fi
-/dev/esb01fs010001      1.00      0.00  100%     1838    69% /oracle
-beuxdsysesb01:root[/root]# cd /oracle
+  mkfifo $OUTPUT_PIPE
-beuxdsysesb01:root[/oracle]# du -gsx * | sort -n
+  tee -a $OUTPUT_LOG < $OUTPUT_PIPE &
-.00    checkpoints
+  OUTPUT_PID=$!
-.00    flash_recovery_area
-.00    lost+found
-.00    oraInst.loc
-.00    oraInventory
-.09    admin
-.99    diag
-</pre>
-cd  diag and repeat until culprits are found
-===Show paged memory hogs on AIX===
+  exec 3>&1 4>&2 >$OUTPUT_PIPE 2>&1
-<pre>
+}
-svmon -Pt20 | perl -e 'while(<>){print if($.==2||$&&&!$s++);$.=0 if(/^-+$/)}'
-</pre>
-===Remove a directory/file containing weird control characters===
+stop_logging()
-Use ls with -i to see inode listing
+{
-<pre>
+  # Make sure that we're currently logging.
-ls -bali
+  if [ -z "$OUTPUT_PID" ]; then
-</pre>
+    echo "Logging not yet started!"
-Use find with -inum to get the filename and -exec to remove it
+    return 1
-<pre>
+  fi
-find . -inum <inode from ls listing> -exec rm -f {} \;
+  exec 1>&3 3>&- 2>&4 4>&-
+  wait $OUTPUT_PID
+  rm -f $OUTPUT_PIPE
+  unset OUTPUT_PID
+}
+example3()
+{
+  start_logging
+  #start_logging delete_existing_logfile
+  echo "This is on standard out"
+  echo "This is on standard err" >&2
+  stop_logging
+}
 </pre>
-===Run a local script on a remote host===
+===RedHat root filesystem has gone read-only===
+* [http://www.unixarena.com/2013/09/redhat-linux-how-to-fix-read-only-root.html How to fix read only root file system]
+===Kill all processes for a user===
 <pre>
-ssh user@host 'sh' < your_script.sh
+for prc in `ps -ef | grep -E "^ +[o]racle" | awk '{print $2}'`; do
+    kill $prc
+done
 </pre>
-First of all, this command is a redirection: your shell will open the file your_script.sh and feed it as input to the ssh command. ssh, in turn, will tunnel its stdin to the remote command, namely, sh instance. And sh without arguments reads its script from stdin. So we got sh instance, which is launched on remote host, but reads commands from your local file.
-===Return a list of Oracle databases running on a list of remote servers===
+===isRGHere===
+Checks if resource group is on this leg of an HACMP cluster. Returns 0 if true else 1.
 <pre>
-#!/bin/ksh
+#!/usr/bin/ksh
-serverlist=`cat /home/tools/ini/system/oracle_servers | sort -n | tr "\n" " "`
+SCRIPT=`basename $0`
-if [ -z "${serverlist}" ]
-then
-    echo "no servers found" && exit 1
-fi
+function rctest
+{
+exitcode=$1
+msg=$2
+if [ $exitcode -ne 0 ]; then
+        echo "********************************************************************************"
+        echo "\nScript $SCRIPT finished with errors."
+        echo "$msg."
+        echo "Returncode : $exitcode."
+        echo "\n********************************************************************************"
-for server in ${serverlist}
+        fi
-do
+exit $exitcode
-    ssh ${server} "ps -ef | grep [o]ra_pmon_" >/tmp/${server}.dblist
-done
-for server in ${serverlist}
+}
-do
-    cat /tmp/${server}.dblist | awk -F_ -v SRV=${server} 'BEGIN {print SRV ":"} {print $NF}' | tr "\n" " "
-    echo
-done
-</pre>
-===Neat way of checking whether SQL output needs sending to someone===
-<pre>
-#!/bin/bash
-tempfile=/tmp/audit_locked_accounts_$ORACLE_SID.txt
-# Start sqlplus and check for locked accounts
+RGINFO=/usr/es/sbin/cluster/utilities/clRGinfo
-sqlplus -S "/ as sysdba" << EOF > $tempfile
+[[ ! -f $RGINFO ]] &&  rctest 1 "clRGinfo not found"
-set pages 0
-select 'The following accounts were found to be unlocked and should not be'
-from dual;
-def exit_status = 0
+if [ $# -eq 1 ]
-col xs new_value exit_status
+then
+        RG=`echo $1 | cut -c 1-14`
+else
+        rctest 10  "Usage: `basename $0` <RG name>"
+fi
-select username
+$RGINFO |grep -qwp $RG ||  rctest 9 "$RG is not defined"
-,      account_status
-,      1 as xs
-from   dba_users
-where  account_status != 'LOCKED'
-and    username in ('HR', 'SCOTT', 'OUTLN', 'MDSYS', 'CTXSYS')
-/
-exit &exit_status
-EOF
-# If the exit status of sqlplus was not 0 then we will send an email
+THISNODE=`/usr/es/sbin/cluster/utilities/get_local_nodename | cut -c 1-14`
-if [ $? != 0 ]; then
+$RGINFO |grep -wp $RG |grep -w $THISNODE |grep -wq ONLINE
-    mail -s "Accounts Unlocked in $ORACLE_SID" oracle < $tempfile
-fi
 </pre>
+===AIX: add a user to a group===
-===Check RMAN logfiles for errors from cron every day===
 <pre>
-09 * * * /home/tools/scripts/oracle/dosh 'find /home/tools/logs/rman -name "*online.log" -mtime -1 -exec sed -ne "/^RMAN-/,/^$/p" {} \\; -ls' | mailx
+chgrpmem -m + oracle ibmtls
- -s 'RMAN errors last night' [email protected]
+</pre>
+===Find swear words in scripts by comparing it to a list found on the internet===
+<pre>
+wget "http://www.bannedwordlist.com/lists/swearWords.csv" -O /tmp/s ; for word in $(cat /tmp/s | sed -e 's/ /_/g' -e 's/,/ /g') ; do grep -wR $word *; done | less
+</pre>
+===grep -p (for paragraph) works on AIX but not on Linux or Solaris===
+Use awk instead
+<pre>
+awk 'BEGIN {FS="\n" RS="\n\n"} /search pattern/ { do something }' <file>
+/usr/xpg4/bin/awk 'BEGIN {RS="\n\n";FS="\n"} /AGRHDWQ1/ {print $2}' dsm.sys | awk '{print $NF}'
 </pre>
+this prints the last word of the second ''line'' in the paragraph in dsm.sys that contains the search term AGRHDWQ1.<br />
+Or slightly simpler...
 <pre>
-/home/ibmtools/scripts/oracle/dosh 'find /oracle/export -name "expdp*log" -mtime -1 -exec grep ORA- {} \; -ls' | mailx -s 'Datapump errors for Baxter last night' [email protected]
+awk -v RS='' '/NHAPPLP1/' /etc/tsm/dsm.sys     # (use /usr/xpg4/bin/awk on Solaris)
 </pre>
-===Run a script on multiple servers===
+or, case insensitively:
 <pre>
-#!/bin/ksh
+awk -v RS='' 'tolower($0) ~/so_u_clubqa_orx_d_cab/' /etc/tsm/dsm.sys
-# ==============================================================================
+</pre>
-# Name         : dosh   (Distributed Oracle SHell)
+Using -v means you don't have to use a BEGIN section.
-# Description  : Runs a command on all Oracle servers
-#
+===debug/redirect log of a shell===
-# Parameters   : h - displays help
+<pre>
-#                v - verbose (default, like all unix commands is silent)
+#!/usr/bin/ksh
-#                c - command to be executed
+exec 2>/tmp/mytest
-#
+</pre>
-# Example      : ./dosh -v -c 'ls -al'
+===Different ways of Iteration in korn shell with a while loop===
-#
+<pre>
-# Modification History
+IFS="|"
-# ====================
+exec 0<$statfile
-# When      Who               What
+while read host db started stopped
-# ========= ================= ==================================================
+do
-# 08-FEB-13 Stuart Barkley    Created
+    rrdfile="export_duration_${host}_${db}.rrd"
-# ==============================================================================
+    $RRDTOOL update ${RRDDIR}/${rrdfile} $started:$started $stopped
+done
-# --------------------------------------------------------------------------
+</pre>
-# this list of servers is generated by the DBAMON tool so will be up to date
+or
-# --------------------------------------------------------------------------
+<pre>
-serverfile=/home/ibmtools/etc/oracle/oracle_servers
+while read host db started stopped
-[[ -z "${serverfile}" ]] && echo "Server list ${serverfile} not found" && exit 1
-serverlist=`cat ${serverfile} | sort -n | tr "\n" " "`
-# -------------------------
-# get the arguments, if any
-# -------------------------
-while getopts "hvc:" OPT
 do
-     case "$OPT" in
+     rrdfile="export_duration_${host}_${db}.rrd"
-     h) echo "\nUsage: $0 [-v] [-h] -c '<command_to_be_executed_remotely>'\n";
+     $RRDTOOL update ${RRDDIR}/${rrdfile} $started:$started $stopped
-       exit;
+done <statfile
-       ;;
+</pre>
-     v) VERBOSE="Y";
+or
-       ;;
+<pre>
-    c) CMMND=$OPTARG;
+     cat $statfile | sort -nk4 | while IFS=\| read host db type started stopped
-       ;;
+    do
-    *) echo "\nUsage: $0 [-v] [-h] -c '<command_to_be_executed_remotely>'\n";
+        [[ "$stopped" == "" ]] && continue
-       exit;
+        rrdfile="export_duration_${host}_${db}.rrd"
-       ;;
+        $RRDTOOL update ${RRDDIR}/${rrdfile} ${started}:${started}:${stopped}
-     esac
+        [[ $? -ne 0 ]] && echo "nok: $?"
-done
+     done
-shift $((OPTIND-1))
+</pre>
-VERBOSE=${VERBOSE:-"N"}
+===Filesystem 100% full, what's taking up all the space?===
+<pre>
+find /oracle/endur -xdev -ls|sort -nr +6|head
+</pre>
+or
+<pre>
+/dev/esb01fs010001      1.00      0.00  100%     1838    69% /oracle
+beuxdsysesb01:root[/root]# cd /oracle
+beuxdsysesb01:root[/oracle]# du -gsx * | sort -n
+.00    checkpoints
+.00    flash_recovery_area
+.00    lost+found
+.00    oraInst.loc
+.00    oraInventory
+.09    admin
+.99    diag
+</pre>
+cd  diag and repeat until culprits are found
-# --------------------------------
+===Show paged memory hogs on AIX===
-# check we have required arguments
+<pre>
-# --------------------------------
+svmon -Pt20 | perl -e 'while(<>){print if($.==2||$&&&!$s++);$.=0 if(/^-+$/)}'
-[[ -z $CMMND ]] && echo "Enter command to be executed like this: $0 -c 'ls -al'" && exit 1
+</pre>
-# ----------------------------
+===Capitalise the first letter of a word in Korn Shell===
-# loop over the remote servers
+Not as easy as it sounds if it needs to work in non-ksh93 shells
-# ----------------------------
+<pre>
-for server in ${serverlist}
+function capit {
-do
+    typeset -u first
-     if [[ "$VERBOSE" == "Y" ]]; then
+     first=${1%"${1#?}"}
-        echo ${server} `date +'%d-%b-%Y %H:%M:%S'`
+    printf "%s\n" "${first}${1#?}"
-        echo "------------------------------------"
+     return 0
-        set -x
+}
-    fi
+</pre>
-    ssh ${server} "$CMMND"
+or maybe more neatly done in Perl...<br />
-     set +x
+This will capitalise each word in a sentence passed into it
-     [[ "$VERBOSE" == "Y" ]] && echo
+<pre>
-done
+function capit {
+     echo "$1" |  perl -pe "s/([\w']+)/\u\L\1/g"
+    return 0
+}
 </pre>
-to be investigated... this one might be cleverer than mine...
+===Remove / rename a directory / file containing weird control characters===
+Use ls with -i to see inode listing
 <pre>
-tmpdir=${TMPDIR:-/tmp}/pssh.$$
+ls -bali
-count=0
-while userhost; do
-    ssh -n -o BatchMode=yes ${userhost} 'uname -a' > ${tmpdir}/${userhost} 2>&1 &
-    count=`expr $count + 1`
-done < userhost.lst
-while [ $count -gt 0 ]; do
-    wait $pids
-    count=`expr $count - 1`
-done
-echo "Output for hosts are in $tmpdir"
 </pre>
+Use find with -inum to get the filename and -exec to remove it
-===How can a shell script find out what directory it is in?===
 <pre>
-DIR="$(cd "$(dirname "$0")" && pwd)"
+find . -inum <inode from ls listing> -exec rm -f {} \;
 </pre>
-===Array processing===
+===Run a local script on a remote host===
+Doing it this way means we do not need to scp the shell over to the host before executing it!
 <pre>
-array=(1 2 3)
+ssh user@host 'sh' < your_script.sh
-unset array[2]
+</pre>
-echo ${array[2]}          # null
+First of all, this command is a redirection: your shell will open the file your_script.sh and feed it as input to the ssh command. ssh, in turn, will tunnel its stdin to the remote command, namely, sh instance. And sh without arguments reads its script from stdin. So we got sh instance, which is launched on remote host, but reads commands from your local file.
-indices=(${!array[@]})    # create an array of the indices of "array"
-size=${#indices[@]}       # the size of "array" is the number of indices into it
-size=${#array[@]}         # same
-echo ${array[@]: -1}      # you can use slices to get array elements, -1 is the last one, etc.
-for element in ${array[@]}; do    # iterate over the array without an index
-for index in ${indices[@]}        # iterate over the array WITH an index
+===Get a list of running instances - but only those started by the current user===
-do
+This is the way I wanted to do it but there's an issue. Where does that spare } character come from? Anyone?
-    echo "Index: ${index}, Element: ${array[index]}"
+<pre>
-done
+ps -ef | grep [p]mon | awk -v dbowner=$(id -un) '{ if ($1==dbowner) { gsub(/ora_pmon_/,"",$NF); print $NF; } }'
+</pre>
-for index in ${!array[@]}         # iterate over the array WITH an index, directly
+ps listing
+<pre>
-array+=("new element")    # append a new element without referring to an index
+$ ps -ef | grep [p]mon
-((counter++))             # shorter than ((counter=counter+1)) or ((counter+=1))
+  oracle 13304024        1   0   Jun 07      -  2:39 ora_pmon_reportk
-if [[ $var == 3 ]]        # you can use the more "natural" comparison operators inside double square brackets
+  oracle 26018178        1   0   Jun 07      -  3:01 ora_pmon_dwh_perf
-while [[ $var < 11 ]]     # another example
+  oracle 29229432        1   0   Jun 07      -  2:30 ora_pmon_adso
-echo ${array[${index}-1]  # math inside an array subscript
+ oraebso 18022994        1   0   Jun 07      -  2:38 ora_pmon_EBSO
+  oracle 30278192        1   0   Jun 07      -  2:48 ora_pmon_owb112k
+</pre>
+Results of above command
+<pre>
+reportk
+dwh_perf
+adso
+}
+owb112k
 </pre>
-===Send an email by talking directly to an smtp server===
+Workaround 1. Send the ps listing to a file and work on it without pipes. Works but it's a bit long-winded especially as we have to clean up afterwards.
 <pre>
-#!/bin/bash
+ps -ef | grep [p]mon>/tmp/results.$$ 2>/dev/null; awk -v dbowner=$(id -un) '{ if ($1==dbowner) { gsub(/ora_pmon_/,"",$NF); print $NF; } }' /tmp/results.$$; rm -f /tmp/results.$$
-telnet smtp.domain.com 25 <<EOTXT>>/tmp/smtp.log
-HELO me.domain.com
-MAIL FROM:<[email protected]>
-RCPT TO:<[email protected]>
-DATA
-From: Stuart <[email protected]>
-To: Anne <[email protected]>
-Subject: testing smtp email
-Hello, this should appear in the body
-.
-QUIT
-EOTXT
 </pre>
-===Send an email by talking directly to an smtp server via file descriptor (no telnet! this time), adding authentication===
+Workaround 2. Don't like the grep -v but until I find out where that } is coming from..
 <pre>
-#!/bin/bash
+ps -ef | grep [p]mon | awk -v dbowner=$(id -un) '{ if ($1==dbowner) { gsub(/ora_pmon_/,"",$NF); print $NF; } }' | egrep -v 'grep|}|ASM'
+</pre>
-#
+===Return a list of Oracle databases running on a list of remote servers===
-# mail.sh
+<pre>
-#
+#!/bin/ksh
-# 2008 - Mike Golvach - [email protected]
-# 2010 - Rayber
+serverlist=`cat /home/tools/ini/system/oracle_servers | sort -n | tr "\n" " "`
-#
-# Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License
-#
-if [ $# -ne 7 ]
+if [ -z "${serverlist}" ]
 then
-echo "Usage: $0 FromAdress ToAdress Domain MailServer MailTextFile AuthEmail AuthPass"
+    echo "no servers found" && exit 1
-exit 1
 fi
-from=$1
-to=$2
-domain=$3
-mailserver=$4
-mailtext=$5
-authemail=`echo $6|openssl enc -base64|awk 'sub("..$", "")'`
-authpass=`echo $7|openssl enc -base64|awk 'sub("..$", "")'`
-if [ ! -f $mailtext ]
+for server in ${serverlist}
-then
+do
-echo "Cannot find your mail text file. Exiting..."
+    ssh ${server} "ps -ef | grep [o]ra_pmon_" >/tmp/${server}.dblist
-exit 1
+done
-fi
+for server in ${serverlist}
+do
+    cat /tmp/${server}.dblist | awk -F_ -v SRV=${server} 'BEGIN {print SRV ":"} {print $NF}' | tr "\n" " "
+    echo
+done
+</pre>
+===Clever trick to check whether SQL output needs sending to someone===
+Using an exit status from SQL*Plus back to the shell so we can decide what to do.  Nice one!
+<pre>
+#!/bin/bash
+tempfile=/tmp/audit_locked_accounts_$ORACLE_SID.txt
-exec 9<>/dev/tcp/$mailserver/25
+# Start sqlplus and check for locked accounts
-echo "HELO $domain" >&9
+sqlplus -S "/ as sysdba" << EOF > $tempfile
-read -r temp <&9
+set pages 0
-echo "$temp"
+select 'The following accounts were found to be unlocked and should not be'
-echo "auth login" >&9
+from dual;
-read -r temp <&9
-echo "$authemail" >&9
-read -r temp <&9
-echo "$authpass" >&9
-read -r temp <&9
-echo "Mail From: $from" >&9
-read -r temp <&9
-echo "$temp"
-echo "Rcpt To: $to" >&9
-read -r temp <&9
-echo "$temp"
-echo "Data" >&9
-read -r temp <&9
-echo "$temp"
-cat $mailtext >&9
-echo "." >&9
-read -r temp <&9
-echo "$temp"
-echo "quit" >&9
-read -r temp <&9
-echo "$temp"
->&-
-<&-
-echo "All Done Sending Email. See above for errors"
-exit 0
-</pre>
-=== rsync examples===
+def exit_status = 0
-Also see [[Distribute files to multiple servers using rsync and ssh]]
+col xs new_value exit_status
-<pre>
-#!/bin/sh
+select username
-ssh  <remote_host> '/bin/mkdir -p /etc /etc/rc.config.d /etc/security /etc/mail'
+,      account_status
-rsync --rsync-path /usr/bin/rsync -Liprogtz --out-format=%f%L  /etc/passwd /etc/passwd.post /etc/group /etc/hosts /etc/services /etc/resolv.conf /etc/exclude.rootvg <remote_host>:/etc
+,      1 as xs
-rsync --rsync-path /usr/bin/rsync -Liprogtz --out-format=%f%L  /etc/hosts.allow.xcat <remote_host>:/etc/hosts.allow
+from   dba_users
-rsync --rsync-path /usr/bin/rsync -Liprogtz --out-format=%f%L  /etc/rc.config.d/sap <remote_host>:/etc/rc.config.d
+where  account_status != 'LOCKED'
-rsync --rsync-path /usr/bin/rsync -Liprogtz --out-format=%f%L  /etc/security/group /etc/security/limits /etc/security/login.cfg /etc/security/passwd /etc/security/user <remote_host>:/etc/security
+and    username in ('HR', 'SCOTT', 'OUTLN', 'MDSYS', 'CTXSYS')
-rsync --rsync-path /usr/bin/rsync -Liprogtz --out-format=%f%L  /etc/mail/sendmail.cf <remote_host>:/etc/mail
+/
+exit &exit_status
+EOF
-rsync -av --progress /home/ibmtools/scripts/oracle/* benouerp07:/home/ibmtools/scripts/oracle/
+# If the exit status of sqlplus was not 0 then we will send an email
+if [ $? != 0 ]; then
+    mail -s "Accounts Unlocked in $ORACLE_SID" oracle < $tempfile
+fi
 </pre>
-===Handy aliases===
+===Check RMAN logfiles for errors from cron every day===
-Strip out comments and blank lines from a file
 <pre>
-alias strip='grep -Ev '\''^(#|$)'\'''
+09 * * * /home/tools/scripts/oracle/dosh 'find /home/tools/logs/rman -name "*online.log" -mtime -1 -exec sed -ne "/^RMAN-/,/^$/p" {} \\; -ls' | mailx
+ -s 'RMAN errors last night' [email protected]
 </pre>
-Does a ps and a grep
 <pre>
-alias psg='ps -ef | grep -v $$ | grep -i '
+/home/ibmtools/scripts/oracle/dosh 'find /oracle/export -name "expdp*log" -mtime -1 -exec grep ORA- {} \; -ls' | mailx -s 'Datapump errors for Baxter last night' [email protected]
 </pre>
-A handy way of listing subdirectories and their files
+===An alternative to getopts===
+These methods have the advantage of allowing arguments of any length not just 1 character
 <pre>
-alias filetree="find . -print | sed -e 's;[^/]*/;|____;g;s;____|; |;g'"
+countArgs=$#
+while [[ $# -gt 0 ]]
+do
+    idx1=$($ECHO $1|$GREP "="|wc -l)
+    if [[ $idx1 -gt 0 ]]; then
+        key=$($ECHO $1|$CUT -d '=' -f 1)
+        value=$($ECHO $1|$CUT -d '=' -f 2)
+    else
+        key=$($ECHO $1|$CUT -d '=' -f 1)
+        idx2=$($ECHO $1|$GREP "^-"|wc -l)
+        if [[ $idx2 -eq 0 ]]; then
+            $ECHO -e "\n ERROR: $1 is an unsupported argument passed to agentDeploy.sh.\n"
+            usage
+            exit 1
+        fi
+    fi
+    case "$key" in
+    -help)
+        if [[ $upgradeFlag ]]; then
+            upgradeUsage
+        else
+            freshUsage
+        fi
+        exit 0;;
+    AGENT_BASE_DIR)
+        agentBaseDir=$($ECHO $value|$SED 's/\/$//')
+        checkBaseFlag=TRUE;;
+    OMS_HOST)
+        omsHost=$value
+        checkOMSHost=TRUE;;
+    EM_UPLOAD_PORT)
+        omsPort=$value
+        checkOMSPort=TRUE;;
+    AGENT_INSTANCE_HOME)
+        instHome=$($ECHO $value | $SED 's/\/$//');;
+    AGENT_REGISTRATION_PASSWORD)
+        pswd=$value;;
+    s_encrSecurePwd)
+        pswd=$value;;
+    RESPONSE_FILE)
+        rspFlag=TRUE
+        rspLoc=$value;;
+    OLD_AGENT_VERSION)
+        oldAgentVersion=$value;;
+    OLDHOME)
+        oldHome=$value;;
+    -debug)
+        debugSwitch=TRUE;;
+    -forceConfigure)
+        forceFlag=TRUE;;
+    -configOnly)
+        configFlag=TRUE
+        validationFlag=TRUE;;
+    -agentImageLocation)
+        archiveLoc=$value
+        checkArchiveFlag=TRUE;;
+    -invPtrLoc) shift
+        ptrLoc=$1;;
+    -Upgrade)
+        UpgradeFlag=TRUE
+        validFlag=TRUE;;
+    INVENTORY_LOCATION)
+        validFlag=TRUE;;
+    b_forceInstCheck)
+        validFlag=TRUE
+        forcefullFlag=TRUE;;
+    -prereqOnly)
+        validationFlag=TRUE
+        prereqFlag=TRUE;;
+    -executeRootsh)
+        validFlag=TRUE;;
+    *)  idx=$($ECHO $1|$GREP "^-"|wc -l)
+        if [[ $idx -eq 0 ]]; then
+            validFlag=TRUE
+        else
+            $ECHO -e "\n ERROR: Invalid argument $key passed."
+            usage
+            exit 1
+        fi
+    esac
+    shift
+done
 </pre>
-Watch progress of a copy
+another way - found in /etc/init.d/functions (daemon function) in Fedora
 <pre>
-alias cpProgress="rsync --progress -ravz"
+    while [ "$1" != "${1##[-+]}" ]; do
-</pre>
+        case $1 in
-Reboots Linksys router<pre>
+        '')
-alias rebootlinksys="curl -u 'admin:password' 'http://192.168.1.2/setup.cgi?todo=reboot'"
+            echo $"$0: Usage: daemon [+/-nicelevel] {program}" "[arg1]..."
+            return 1
+            ;;
+        --check)
+            base=$2
+            gotbase="yes"
+            shift 2
+            ;;
+        --check=?*)
+            base=${1#--check=}
+            gotbase="yes"
+            shift
+            ;;
+        --user)
+            user=$2
+            shift 2
+            ;;
+        --user=?*)
+            user=${1#--user=}
+            shift
+            ;;
+        --pidfile)
+            pid_file=$2
+            shift 2
+            ;;
+        --pidfile=?*)
+            pid_file=${1#--pidfile=}
+            shift
+            ;;
+        --force)
+            force="force"
+            shift
+            ;;
+        [-+][0-9]*)
+            nice="nice -n $1"
+            shift
+            ;;
+        *)
+            echo $"$0: Usage: daemon [+/-nicelevel] {program}" "[arg1]..."
+            return 1
+            ;;
+      esac
+    done
 </pre>
-Nice one for bash. Colour codes the prompt depending on the outcome of the previous command
+another way - found in adstrtal.sh (middleware start script for EBS)
 <pre>
-bash_prompt_command()
-{
-    RTN=$?
-    prevCmd=$(prevCmd $RTN)
-}
-PROMPT_COMMAND=bash_prompt_command
-prevCmd()
-{
-    if [ $1 == 0 ] ; then
-        echo $GREEN
-    else
-        echo $RED
-    fi
-}
-if [ $(tput colors) -gt 0 ] ; then
-    RED=$(tput setaf 1)
-    GREEN=$(tput setaf 2)
-    RST=$(tput op)
-fi
-export PS1="\[\e[36m\]\u.\h.\W\[\e[0m\]\[\$prevCmd\]>\[$RST\]"
-</pre>
-Mmmm, to be looked into. Executes remote commands on a unix box using curl.
-<pre>
-#/bin/sh
 #
-# WAG320N-HACK
+# Parse Arguments
-# Ver. 1.0
-# 12/09/2010
 #
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-# Set username and password in the form of "username:password"
+for nxtarg in $*
-# example: "admin:admin"
+do
-my_access="admin:admin"
+  arg=`echo $nxtarg | sed 's/^//'`
+  case $arg in
+    -secureapps)    if test "$secureapps" = "" ; then
+                       secureapps=$arg
+                    else
+                       echo "$0: Duplicate Argument passed : $arg"
+                       usage
+                    fi
+                ;;
+    -nodbchk)       if test "$nodbchk" = "" ; then
+                       nodbchk=$arg
+                    else
+                       echo "$0: Duplicate Argument passed : $arg"
+                       usage
+                    fi
+                ;;
+    -nopromptmsg)   if test "$nopromptmsg" = "" ; then
+                       nopromptmsg=$arg
+                    else
+                       echo "$0: Duplicate Argument passed : $arg"
+                       usage
+                    fi
+                ;;
+    *)              if test "$unpw" = "" ; then
+                       unpw=$arg
+                    else
+                       echo "$0: Duplicate Argument passed : $arg"
+                       usage
+                    fi
+  esac
+done
+</pre>
+and another in adautocfg.sh
+<pre>
+for myarg in $*
+do
-# Parameters test
+   arg=`echo $myarg | sed 's/^-//'`
-if [ -z "$1" ]
+   case $arg in
-then
+    appspass=*)
-   echo "wag320n-hack.sh: missing remote command"
+            appspass=`echo $arg | sed 's/appspass=//g'`
-  echo "usage: wag320n-hack.sh <remote command>"
+            shift
-  echo "example: wag320n-hack.sh /bin/ls -la /usr/sbin"
+            ;;
-   echo "Note: always use full path"
+    nocustom)
-  echo ""
+            myparams="$myparams $arg"
-  echo "wag320n-hack.sh - Ver. 1.0 - 12/09/2010"
+            shift
-  echo "Licensed under GPL V. 3"
+            ;;
-  echo ""
+    noversionchecks)
-  exit 0
+            myparams="$myparams $arg"
-fi
+            shift
+            ;;
-# Get the command
+    promptmsg=*)
-my_command="ping_size="'$('"$@"' 1>&2)'
+            promptmsg=`echo $arg | sed 's/promptmsg=//g'`
+            shift
-curl -s -G -u "$my_access" --data-urlencode 'todo=ping_test' --data-urlencode 'this_file=Diagnostics.htm' --data-urlencode 'next_file=Ping.htm' --data-urlencode 'c4_ping_ipaddr=192.168.1.1' --data-urlencode 'ping_timeout=5000' --data-urlencode 'ping_interval=1000' --data-urlencode 'ping_number=1' --data-urlencode "$my_command" http://192.168.1.1/setup.cgi | sed -e '/HTTP\/1.0 200 OK/q'
+            ;;
+        *)  echo "$0: unrecognized action specified"
+            exit 1
+  esac
+done
 </pre>
-===How to configure SSH with public/private keys===
+===Run a script on multiple servers===
-* [http://www.unixpeople.com/HOWTO/configuring.ssh.html unixpeople.com]
-===Use SSH config file===
 <pre>
-Host server10
+#!/bin/ksh
-   Hostname 1.2.3.4
+# ==============================================================================
-  IdentityFile ~/.ssh/id_dsa
+# Name         : dosh   (Distributed Oracle SHell)
-   user foobar
+# Description  : Runs a command on all Oracle servers
-  Port 30000
+#
-  ForwardX11Trusted yes
+# Parameters   : h - displays help
-  TCPKeepAlive yes
+#                v - verbose (default, like all unix commands is silent)
-</pre>
+#                c - command to be executed
-then just connect using
+#
-<pre>
+# Example      : ./dosh -v -c 'ls -al'
-ssh server10
+#
-</pre>
+# Modification History
+# ====================
+# When      Who               What
+# ========= ================= ==================================================
+# 08-FEB-13 Stuart Barkley    Created
+# ==============================================================================
-===A decent sed tutorial===
+# --------------------------------------------------------------------------
-From [http://www.grymoire.com/Unix/Sed.html grymoire.com]
+# this list of servers is generated by the DBAMON tool so will be up to date
-===A decent korn/bash shell tutorial===
+# --------------------------------------------------------------------------
-From [http://www.dartmouth.edu/~rc/classes/ksh/print_pages.shtml dartmouth.edu]
+serverfile=/home/ibmtools/etc/oracle/oracle_servers
-Reproduced here just in case it disappears!
+[[ -z "${serverfile}" ]] && echo "Server list ${serverfile} not found" && exit 1
-[[Advanced shell scripting]]
-===trap===
+serverlist=`cat ${serverfile} | sort -n | tr "\n" " "`
-<pre>
-     Example Handling Traps With ksh - Discussion of the kill command
-EXAMPLE TEMPLATE:
+# -------------------------
+# get the arguments, if any
+# -------------------------
-PRODUCT:    HP-UX 11iV1 Version B.11.11
+while getopts "hvc:" OPT
-            HP Tru64 V5.1B PK4
+do
-            Sun/Solaris SunOS V5.8
+    case "$OPT" in
-            Linux 2.6 kernel
+    h) echo "\nUsage: $0 [-v] [-h] -c '<command_to_be_executed_remotely>'\n";
+       exit;
+       ;;
-COMPONENT:  ksh
+    v) VERBOSE="Y";
+       ;;
+    c) CMMND=$OPTARG;
+       ;;
+    *) echo "\nUsage: $0 [-v] [-h] -c '<command_to_be_executed_remotely>'\n";
+       exit;
+       ;;
+    esac
+done
+shift $((OPTIND-1))
+VERBOSE=${VERBOSE:-"N"}
-SOURCE:     Philippe Vouters
+# --------------------------------
-            Fontainebleau/France
+# check we have required arguments
+# --------------------------------
+[[ -z $CMMND ]] && echo "Enter command to be executed like this: $0 -c 'ls -al'" && exit 1
-LOW COST HIGH-TECH PRODUCTS:  http://techno-star.fr
+# ----------------------------
+# loop over the remote servers
+# ----------------------------
-OVERVIEW:
+for server in ${serverlist}
+do
+    if [[ "$VERBOSE" == "Y" ]]; then
+        echo ${server} `date +'%d-%b-%Y %H:%M:%S'`
+        echo "------------------------------------"
+        set -x
+    fi
+    ssh ${server} "$CMMND"
+    set +x
+    [[ "$VERBOSE" == "Y" ]] && echo
+done
+</pre>
+to be investigated... this one might be cleverer than mine...
+<pre>
+tmpdir=${TMPDIR:-/tmp}/pssh.$$
+count=0
+while userhost; do
+    ssh -n -o BatchMode=yes ${userhost} 'uname -a' > ${tmpdir}/${userhost} 2>&1 &
+    count=`expr $count + 1`
+done < userhost.lst
+while [ $count -gt 0 ]; do
+    wait $pids
+    count=`expr $count - 1`
+done
+echo "Output for hosts are in $tmpdir"
-The ksh script below shows how to eventually handle traps in the situation
+</pre>
-where someone might try to kill a script by killing individual commands run
-by that script or the entire process group a script is running in. The kill
-command (usually a shell builtin) may be used to send a signal to a process
-group (with the -<pid> syntax) or an individual process. The example ksh
-script below runs /bin/sleep as the foreground process, the example ksh
-scripts immediately returns when the /bin/sleep process has terminated. Most
-signals sent to the shell are ignored until after the foreground process
-terminates. This is in order to avoid creating zombie processes. Therefore a
-kill <pid> on the example ksh script waits for the termination of the
-/bin/sleep process.
-The status value $? in the trap refers to the exit status of the command to run
-and therefore is the exit status of the /bin/sleep process. The called function
-in the trap handler shows how to correctly examine the effect of the kill
-command on the shell or it's children.
-To examine the value of $? in a trap handler means that you must understand what
+improved version...<br />
-it can be set and how different signals delivered to either the shell or the
+just escape double quotes and dollar signs...
-foreground process (or the process group) might affect the value of $?.
+<pre>
+#!/bin/ksh
-The example shell script prints $? using echo but it does not perform tests on
+# ==============================================================================
-the value of $?. For a complete solution when attempting to trap signals in a
+# Name         : dosh   (Distributed Oracle SHell)
-shell you would also need code that examined the value of $? after the
+# Description  : Runs a command on all Oracle servers
-foreground process had completed.
+#
+# Parameters   : h - displays help
+#                v - verbose (default, like all unix commands is silent)
+#                c - command to be executed
+#
+# Example      : ./dosh -v -c 'ls -al'
+#
+# Modification History
+# ====================
+# When      Who               What
+# ========= ================= ==================================================
+# 08-FEB-13 Stuart Barkley    Created
+# 08-JUL-15 Stuart Barkley    Background execution mode
+# ==============================================================================
+# --------------------------------------------------------------------------
+# this list of servers is generated by the DBAMON tool so will be up to date
+# --------------------------------------------------------------------------
+serverfile=/home/ibmtools/etc/oracle/oracle_servers
+[[ -z "${serverfile}" ]] && echo "Server list ${serverfile} not found" && exit 1
+serverlist=`cat ${serverfile} | sort -n | tr "\n" " "`
-*** CAUTION ***
-This sample script has been tested using HP-UX B.11.11, HP Tru64 V5.1B PK4,
+# -------------------------
-SunOS V5.8 and Fedora Core 4 (homed version of Red Hat Linux).  However, we
+# get the arguments, if any
-cannot guarantee its effectiveness because of the possibility of error in
+# -------------------------
-transmitting or implementing it. It is meant to be used as a template for
+while getopts "hbvc:" OPT
-writing your own scripts, and may require modification for use on your system.
+do
+    case "$OPT" in
+    h) echo "\nUsage: $0 [-b] [-v] [-h] -c '<command_to_be_executed_remotely>'\n";
+       exit;
+       ;;
+    b) BACKGROUND="Y";
+       ;;
+    v) VERBOSE="Y";
+       ;;
+    c) CMMND=$OPTARG;
+       ;;
+    *) echo "\nUsage: $0 [-b] [-v] [-h] -c '<command_to_be_executed_remotely>'\n";
+       exit;
+       ;;
+    esac
+done
+shift $((OPTIND-1))
+VERBOSE=${VERBOSE:-"N"}
+# --------------------------------
+# check we have required arguments
+# --------------------------------
+[[ -z $CMMND ]] && echo "Enter command to be executed like this: $0 -c 'ls -al'" && exit 1
-SCRIPT NOTES:
+# ---------------------------------
+# put the thing to be run in a file
+# ---------------------------------
+printf "%s\n" "$CMMND" > /tmp/dosh.$$
-To notice that the ksh script and /bin/sleep share the same process group
-identifier (PGID), issue the following commands:
-[philippe@victor ~]$ who
+# ----------------------------
-philippe :0           Jan 10 10:16
+# loop over the remote servers
-philippe pts/1        Jan 10 21:30 (:0.0)
+# ----------------------------
-philippe pts/2        Jan 10 21:30 (:0.0)
+for server in ${serverlist}
-[philippe@victor ~]$ tty
+do
-/dev/pts/1
+    if [[ "$VERBOSE" == "Y" ]]; then
-[philippe@victor ~]$ ps -j -t pts/2
+        printf "%s\n" ${server} `date +'%d-%b-%Y %H:%M:%S'`
-  PID  PGID   SID TTY          TIME CMD
+        printf "%s\n" "------------------------------------"
-11072 11072 pts/2    00:00:00 bash
+        set -x
-11113 11072 pts/2    00:00:00 ksh
+    fi
-11113 11072 pts/2    00:00:00 sleep
+    scp -q /tmp/dosh.$$ ${server}:/tmp/
+    if [[ "$BACKGROUND" == "Y" ]]; then
+        ssh -n -o BatchMode=yes ${server} "ksh /tmp/dosh.$$; rm -f /tmp/dosh.$$"> /tmp/dosh_${server}.out 2>&1 &
+    else
+        ssh -n -o BatchMode=yes ${server} "ksh /tmp/dosh.$$; rm -f /tmp/dosh.$$"
+    fi
+    set +x
+    [[ "$VERBOSE" == "Y" ]] && echo
+done
+rm -f /tmp/dosh.$$
-In this case sending kill -INT -11113 will send SIGINT to the process group
+[[ "$BACKGROUND" == "Y" ]] && printf "%s\n" "Type 'ls -altr /tmp/dosh*out' to see output from the commands"
-. Both of the ksh and sleep processes are contained within this process
+</pre>
-group.
-Important Note:
+===How can a shell script find out what directory it is in?===
+basename $0 does not always give the desired answer (might give "./"!
+<pre>
+DIR="$(cd "$(dirname "$0")" && pwd)"
+</pre>
-On HP-UX, you have to $ export UNIX95=1 in order to be able to use the
+===Array processing===
--j option of the ps command.
+<pre>
+array=(1 2 3)
+unset array[2]
+echo ${array[2]}          # null
+indices=(${!array[@]})    # create an array of the indices of "array"
+size=${#indices[@]}       # the size of "array" is the number of indices into it
+size=${#array[@]}         # same
+echo ${array[@]: -1}      # you can use slices to get array elements, -1 is the last one, etc.
+for element in ${array[@]}; do    # iterate over the array without an index
+for index in ${indices[@]}        # iterate over the array WITH an index
+do
+    echo "Index: ${index}, Element: ${array[index]}"
+done
-SCRIPT:
+for index in ${!array[@]}         # iterate over the array WITH an index, directly
-                             COPYRIGHT (C) 2005 BY
+array+=("new element")    # append a new element without referring to an index
-                              HEWLETT-PACKARD COMPANY
+((counter++))             # shorter than ((counter=counter+1)) or ((counter+=1))
-                                ALL RIGHTS RESERVED.
+if [[ $var == 3 ]]        # you can use the more "natural" comparison operators inside double square brackets
+while [[ $var < 11 ]]     # another example
+echo ${array[${index}-1]  # math inside an array subscript
+</pre>
+===Send an email by talking directly to an smtp server===
+<pre>
+#!/bin/bash
+telnet smtp.domain.com 25 <<EOTXT>>/tmp/smtp.log
+HELO me.domain.com
+MAIL FROM:<[email protected]>
+RCPT TO:<[email protected]>
+DATA
+From: Stuart <[email protected]>
+To: Anne <[email protected]>
+Subject: testing smtp email
-     THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
+Hello, this should appear in the body
-     ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND WITH THE INCLUSION
+.
-     OF THE ABOVE COPYRIGHT NOTICE.  THIS SOFTWARE OR ANY OTHER COPIES
+QUIT
-     THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY OTHER
+EOTXT
-     PERSON.  NO TITLE TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY TRANSFERRED.
+</pre>
+===Send an email by talking directly to an smtp server via file descriptor (no telnet! this time), adding authentication===
+<pre>
+#!/bin/bash
-     THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE AND
+#
-     SHOULD NOT BE CONSTRUED AS A COMMITMENT BY HEWLETT-PACKARD COMPANY.
+# mail.sh
+#
+# 2008 - Mike Golvach - [email protected]
+# 2010 - Rayber
+#
+# Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License
+#
-     HP ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS
+if [ $# -ne 7 ]
-     SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY HP.
+then
+echo "Usage: $0 FromAdress ToAdress Domain MailServer MailTextFile AuthEmail AuthPass"
+exit 1
+fi
-     NO RESPONSIBILITY IS ASSUMED FOR THE USE OR RELIABILITY OF SOFTWARE
+from=$1
-     ON EQUIPMENT THAT IS NOT SUPPLIED BY HEWLETT-PACKARD COMPANY.
+to=$2
+domain=$3
+mailserver=$4
+mailtext=$5
+authemail=`echo $6|openssl enc -base64|awk 'sub("..$", "")'`
+authpass=`echo $7|openssl enc -base64|awk 'sub("..$", "")'`
-     SUPPORT FOR THIS SOFTWARE IS NOT COVERED UNDER ANY HP SOFTWARE
+if [ ! -f $mailtext ]
-     PRODUCT SUPPORT CONTRACT, BUT MAY BE PROVIDED UNDER THE TERMS OF THE
+then
-     CONSULTING AGREEMENT UNDER WHICH THIS SOFTWARE WAS DEVELOPED.
+echo "Cannot find your mail text file. Exiting..."
+exit 1
+fi
-#!/bin/ksh
+exec 9<>/dev/tcp/$mailserver/25
-function handle_signal
+echo "HELO $domain" >&9
-{
+read -r temp <&9
-        print -n "pid $$ recieved $2 "
+echo "$temp"
-        if [[ $1 = 0 ]];then
+echo "auth login" >&9
-            print but foreground command ended successfully
+read -r temp <&9
-        else
+echo "$authemail" >&9
-                if [[ $1 = $3 ]];then
+read -r temp <&9
-                    print and so did the last foreground command
+echo "$authpass" >&9
-                else
+read -r temp <&9
-                    print -n "and the exit status of the last foreground "
+echo "Mail From: $from" >&9
-                    print command was $1
+read -r temp <&9
-                fi
+echo "$temp"
-        fi
+echo "Rcpt To: $to" >&9
-        # Kill our process group and then ourselves with SIGTERM, giving a
+read -r temp <&9
-        # pid of 0 sends the signal to our process group. Killing the process
+echo "$temp"
-        # group should kill us as well, this assumes that SIGTERM is not
+echo "Data" >&9
-        # handled by any process in the process group.
+read -r temp <&9
-        #
+echo "$temp"
-        # This code could be replaced with an exit with an exit value that
+cat $mailtext >&9
-        # would indicate what the problem was to the caller. That is replace
+echo "." >&9
-        # these two lines with:
+read -r temp <&9
-        #
+echo "$temp"
-        # exit $3
+echo "quit" >&9
-        #
+read -r temp <&9
-        # or a specific exit code could be used.
+echo "$temp"
-        #
+>&-
-        kill -TERM 0
+<&-
-        kill -TERM $$
+echo "All Done Sending Email. See above for errors"
-        }
+exit 0
-OS=$(uname -a | awk '{print $1}')
-if [[ "$OS" = "Linux" ]]; then
-    offset=256
-elif [[ ("$OS" = "HP-UX") ||
-        ("$OS" = "SunOS") ||
-        ("$OS" = "OSF1") ]]; then
-   offset=128
-fi
-trap 'RC=$?; handle_signal $RC SIGINT $offset+2' INT
-trap 'RC=$?; handle_signal $RC SIGQUIT $offset+3' QUIT
-/bin/sleep 20
-echo $?
 </pre>
-===DNS not working===
-Ping to an IP address works
- ping 74.125.136.103
-but this doesn't
- ping www.google.com
-Check resolv.conf
+=== rsync examples===
-  cat /etc/resolv.conf
+Also see [[Distribute files to multiple servers using rsync and ssh]]
-  nameserver 95.130.132.17
+<pre>
-  nameserver 95.130.132.18
+#!/bin/sh
-I had changed internet provider and forgot to update this. Just to set it to the router address and let that do the resolution
+ssh  <remote_host> '/bin/mkdir -p /etc /etc/rc.config.d /etc/security /etc/mail'
-  nameserver 192.168.1.1
+rsync --rsync-path /usr/bin/rsync -Liprogtz --out-format=%f%L  /etc/passwd /etc/passwd.post /etc/group /etc/hosts /etc/services /etc/resolv.conf /etc/exclude.rootvg <remote_host>:/etc
+rsync --rsync-path /usr/bin/rsync -Liprogtz --out-format=%f%L  /etc/hosts.allow.xcat <remote_host>:/etc/hosts.allow
+rsync --rsync-path /usr/bin/rsync -Liprogtz --out-format=%f%L  /etc/rc.config.d/sap <remote_host>:/etc/rc.config.d
+rsync --rsync-path /usr/bin/rsync -Liprogtz --out-format=%f%L  /etc/security/group /etc/security/limits /etc/security/login.cfg /etc/security/passwd /etc/security/user <remote_host>:/etc/security
+rsync --rsync-path /usr/bin/rsync -Liprogtz --out-format=%f%L  /etc/mail/sendmail.cf <remote_host>:/etc/mail
+rsync -av --progress /home/ibmtools/scripts/oracle/* benouerp07:/home/ibmtools/scripts/oracle/
+</pre>
-===File descriptors===
+===Handy aliases===
+Strip out comments and blank lines from a file
 <pre>
-exec 3<> /tmp/foo  #open fd 3 for r/w
+alias strip='grep -Ev '\''^(#|$)'\'''
-echo "test" >&3
+</pre>
-exec 3>&- #close fd 3.
+Does a ps and a grep
+<pre>
+alias psg='ps -ef | grep -v $$ | grep -i '
 </pre>
+Getting a decent listing of filesystem space available. It is ordered such that the filesystems with no space left are at the end.
 <pre>
-exec 3<> myfile.txt
+OS=$(uname -s)
-while read line <&3
+[[ "$OS" == "SunOS" ]] && alias dfg='df -h|sed -e '1d'|sort -n -k5|awk '\'' BEGIN {printf("%-35s%-10s%-10s%-6s%-30s\n","Filesystem","Total","Free","%Used","Mounted on")} {printf("%-35s%-10s%-10s%-6s%-30s\n",$1,$2,$4,$5,$6)}'\'''
-do {
+[[ "$OS" == "AIX" ]]   && alias dfg='df -g|sed -e '1d'|sort -n -k4|awk '\'' BEGIN {printf("%-35s%-10s%-10s%-6s%-30s\n","Filesystem","Total GB","Free","%Used","Mounted on")} {printf("%-35s%-10s%-10s%-6s%-30s\n",$1,$2,$3,$4,$7)}'\'''
-  echo "$line"
-   (( Lines++ ));                   #  Incremented values of this variable
-                                   #+ accessible outside loop.
-                                   #  No subshell, no problem.
-}
-done
-exec 3>&-
-echo "Number of lines read = $Lines"     # 8
 </pre>
-Mmm. See our output and also tee it to a log file!
+A handy way of listing subdirectories and their files
 <pre>
-#!/bin/bash
+alias filetree="find . -print | sed -e 's;[^/]*/;|____;g;s;____|; |;g'"
+</pre>
-echo hello
+Watch progress of a copy
+<pre>
-if test -t 1; then
+alias cpProgress="rsync --progress -ravz"
-    # Stdout is a terminal.
-    exec >log
-else
-    # Stdout is not a terminal.
-    npipe=/tmp/$$.tmp
-    trap "rm -f $npipe" EXIT
-    mknod $npipe p
-    tee <$npipe log &
-    exec 1>&-
-    exec 1>$npipe
-fi
-echo goodbye
 </pre>
+Reboots Linksys router<pre>
-===Create new image with kvm===
+alias rebootlinksys="curl -u 'admin:password' 'http://192.168.1.2/setup.cgi?todo=reboot'"
-Ref: http://www.cyberciti.biz/faq/kvm-virtualization-in-redhat-centos-scientific-linux-6/<br />
-Build an empty space for a CentOS virtual machine
-<pre>
-qemu-img create -f qcow2 centos.img 12G
 </pre>
-Tried creating image with
+Nice one for bash. Colour codes the prompt depending on the outcome of the previous command
 <pre>
-sudo virt-install -n CentOS --description "Trying out CentOS" --ram=1024 --vcpus=1 --cpu host --hvm --cdrom /home/bey9at77/Downloads/c6-x86_64-20130910-1.qcow2 --graphics vnc --disk path=/var/lib/libvirt/images/centos.img,bus=virtio,size=10
+bash_prompt_command()
-</pre>
+{
-gives error
+    RTN=$?
-<pre>
+    prevCmd=$(prevCmd $RTN)
-Starting install...
+}
-Allocating 'centos.img'                                                                                                                                                                                               |  10 GB     00:00
+PROMPT_COMMAND=bash_prompt_command
-ERROR    internal error Process exited while reading console log output: char device redirected to /dev/pts/1
+prevCmd()
-qemu-kvm: -drive file=/home/bey9at77/Downloads/c6-x86_64-20130910-1.qcow2.bz2,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw: could not open disk image /home/bey9at77/Downloads/c6-x86_64-20130910-1.qcow2: Permission denied
+{
-</pre>
+    if [ $1 == 0 ] ; then
-<pre>
+        echo $GREEN
-</pre>
+    else
-<pre>
+        echo $RED
-</pre>
+    fi
+}
-===Install rpmforge repository===
+if [ $(tput colors) -gt 0 ] ; then
-* Download rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
+    RED=$(tput setaf 1)
-* Import the key
+    GREEN=$(tput setaf 2)
-<pre>
+    RST=$(tput op)
-sudo rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt
+fi
-</pre>
+export PS1="\[\e[36m\]\u.\h.\W\[\e[0m\]\[\$prevCmd\]>\[$RST\]"
-* Install the repository
+</pre>
-<pre>
+Mmmm, to be looked into. Executes remote commands on a unix box using curl.
-sudo rpm -i rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
+<pre>
-</pre>
+#/bin/sh
-* Check the installation
+#
-<pre>
+# WAG320N-HACK
-rpm -K rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
+# Ver. 1.0
-</pre>
+# 12/09/2010
-* Test it
+#
-<pre>
+# This program is free software: you can redistribute it and/or modify
-sudo yum install terminator
+# it under the terms of the GNU General Public License as published by
-</pre>
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# Set username and password in the form of "username:password"
+# example: "admin:admin"
+my_access="admin:admin"
+# Parameters test
+if [ -z "$1" ]
+then
+  echo "wag320n-hack.sh: missing remote command"
+  echo "usage: wag320n-hack.sh <remote command>"
+  echo "example: wag320n-hack.sh /bin/ls -la /usr/sbin"
+  echo "Note: always use full path"
+  echo ""
+  echo "wag320n-hack.sh - Ver. 1.0 - 12/09/2010"
+  echo "Licensed under GPL V. 3"
+  echo ""
+  exit 0
+fi
+# Get the command
+my_command="ping_size="'$('"$@"' 1>&2)'
+curl -s -G -u "$my_access" --data-urlencode 'todo=ping_test' --data-urlencode 'this_file=Diagnostics.htm' --data-urlencode 'next_file=Ping.htm' --data-urlencode 'c4_ping_ipaddr=192.168.1.1' --data-urlencode 'ping_timeout=5000' --data-urlencode 'ping_interval=1000' --data-urlencode 'ping_number=1' --data-urlencode "$my_command" http://192.168.1.1/setup.cgi | sed -e '/HTTP\/1.0 200 OK/q'
+</pre>
+===How to configure SSH with public/private keys===
+* [http://www.unixpeople.com/HOWTO/configuring.ssh.html unixpeople.com]
+===Use SSH config file===
+<pre>
+Host server10
+  Hostname 1.2.3.4
+  IdentityFile ~/.ssh/id_dsa
+  user foobar
+  Port 30000
+  ForwardX11Trusted yes
+  TCPKeepAlive yes
+</pre>
+then just connect using
+<pre>
+ssh server10
+</pre>
+===A decent sed tutorial===
+From [http://www.grymoire.com/Unix/Sed.html grymoire.com]
+===A decent korn/bash shell tutorial===
+From [http://www.dartmouth.edu/~rc/classes/ksh/print_pages.shtml dartmouth.edu]
+Reproduced here just in case it disappears!
+[[Advanced shell scripting]]
+===trap===
+<pre>
+     Example Handling Traps With ksh - Discussion of the kill command
+EXAMPLE TEMPLATE:
+PRODUCT:    HP-UX 11iV1 Version B.11.11
+            HP Tru64 V5.1B PK4
+            Sun/Solaris SunOS V5.8
+            Linux 2.6 kernel
+COMPONENT:  ksh
+SOURCE:     Philippe Vouters
+            Fontainebleau/France
+LOW COST HIGH-TECH PRODUCTS:  http://techno-star.fr
+OVERVIEW:
+The ksh script below shows how to eventually handle traps in the situation
+where someone might try to kill a script by killing individual commands run
+by that script or the entire process group a script is running in. The kill
+command (usually a shell builtin) may be used to send a signal to a process
+group (with the -<pid> syntax) or an individual process. The example ksh
+script below runs /bin/sleep as the foreground process, the example ksh
+scripts immediately returns when the /bin/sleep process has terminated. Most
+signals sent to the shell are ignored until after the foreground process
+terminates. This is in order to avoid creating zombie processes. Therefore a
+kill <pid> on the example ksh script waits for the termination of the
+/bin/sleep process.
+The status value $? in the trap refers to the exit status of the command to run
+and therefore is the exit status of the /bin/sleep process. The called function
+in the trap handler shows how to correctly examine the effect of the kill
+command on the shell or it's children.
+To examine the value of $? in a trap handler means that you must understand what
+it can be set and how different signals delivered to either the shell or the
+foreground process (or the process group) might affect the value of $?.
+The example shell script prints $? using echo but it does not perform tests on
+the value of $?. For a complete solution when attempting to trap signals in a
+shell you would also need code that examined the value of $? after the
+foreground process had completed.
+*** CAUTION ***
+This sample script has been tested using HP-UX B.11.11, HP Tru64 V5.1B PK4,
+SunOS V5.8 and Fedora Core 4 (homed version of Red Hat Linux).  However, we
+cannot guarantee its effectiveness because of the possibility of error in
+transmitting or implementing it. It is meant to be used as a template for
+writing your own scripts, and may require modification for use on your system.
+SCRIPT NOTES:
+To notice that the ksh script and /bin/sleep share the same process group
+identifier (PGID), issue the following commands:
+[philippe@victor ~]$ who
+philippe :0           Jan 10 10:16
+philippe pts/1        Jan 10 21:30 (:0.0)
+philippe pts/2        Jan 10 21:30 (:0.0)
+[philippe@victor ~]$ tty
+/dev/pts/1
+[philippe@victor ~]$ ps -j -t pts/2
+  PID  PGID   SID TTY          TIME CMD
+11072 11072 pts/2    00:00:00 bash
+11113 11072 pts/2    00:00:00 ksh
+11113 11072 pts/2    00:00:00 sleep
+In this case sending kill -INT -11113 will send SIGINT to the process group
+. Both of the ksh and sleep processes are contained within this process
+group.
+Important Note:
+On HP-UX, you have to $ export UNIX95=1 in order to be able to use the
+-j option of the ps command.
+SCRIPT:
+                             COPYRIGHT (C) 2005 BY
+                              HEWLETT-PACKARD COMPANY
+                                ALL RIGHTS RESERVED.
+     THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
+     ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND WITH THE INCLUSION
+     OF THE ABOVE COPYRIGHT NOTICE.  THIS SOFTWARE OR ANY OTHER COPIES
+     THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY OTHER
+     PERSON.  NO TITLE TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY TRANSFERRED.
+     THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE AND
+     SHOULD NOT BE CONSTRUED AS A COMMITMENT BY HEWLETT-PACKARD COMPANY.
+     HP ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS
+     SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY HP.
+     NO RESPONSIBILITY IS ASSUMED FOR THE USE OR RELIABILITY OF SOFTWARE
+     ON EQUIPMENT THAT IS NOT SUPPLIED BY HEWLETT-PACKARD COMPANY.
+     SUPPORT FOR THIS SOFTWARE IS NOT COVERED UNDER ANY HP SOFTWARE
+     PRODUCT SUPPORT CONTRACT, BUT MAY BE PROVIDED UNDER THE TERMS OF THE
+     CONSULTING AGREEMENT UNDER WHICH THIS SOFTWARE WAS DEVELOPED.
+#!/bin/ksh
+function handle_signal
+{
+        print -n "pid $$ recieved $2 "
+        if [[ $1 = 0 ]];then
+            print but foreground command ended successfully
+        else
+                if [[ $1 = $3 ]];then
+                    print and so did the last foreground command
+                else
+                    print -n "and the exit status of the last foreground "
+                    print command was $1
+                fi
+        fi
+        # Kill our process group and then ourselves with SIGTERM, giving a
+        # pid of 0 sends the signal to our process group. Killing the process
+        # group should kill us as well, this assumes that SIGTERM is not
+        # handled by any process in the process group.
+        #
+        # This code could be replaced with an exit with an exit value that
+        # would indicate what the problem was to the caller. That is replace
+        # these two lines with:
+        #
+        # exit $3
+        #
+        # or a specific exit code could be used.
+        #
+        kill -TERM 0
+        kill -TERM $$
+        }
+OS=$(uname -a | awk '{print $1}')
+if [[ "$OS" = "Linux" ]]; then
+    offset=256
+elif [[ ("$OS" = "HP-UX") ||
+        ("$OS" = "SunOS") ||
+        ("$OS" = "OSF1") ]]; then
+   offset=128
+fi
+trap 'RC=$?; handle_signal $RC SIGINT $offset+2' INT
+trap 'RC=$?; handle_signal $RC SIGQUIT $offset+3' QUIT
+/bin/sleep 20
+echo $?
+</pre>
+===DNS not working===
+Ping to an IP address works
+ ping 74.125.136.103
+but this doesn't
+ ping www.google.com
+Check resolv.conf
+ cat /etc/resolv.conf
+ nameserver 95.130.132.17
+ nameserver 95.130.132.18
+I had changed internet provider and forgot to update this. Just to set it to the router address and let that do the resolution
+ nameserver 192.168.1.1
+===File descriptors===
+<pre>
+exec 3<> /tmp/foo  #open fd 3 for r/w
+echo "test" >&3
+exec 3>&- #close fd 3.
+</pre>
+<pre>
+exec 3<> myfile.txt
+while read line <&3
+do {
+  echo "$line"
+  (( Lines++ ));                   #  Incremented values of this variable
+                                   #+ accessible outside loop.
+                                   #  No subshell, no problem.
+}
+done
+exec 3>&-
+echo "Number of lines read = $Lines"     # 8
+</pre>
+Mmm. See our output and also tee it to a log file!
+<pre>
+#!/bin/bash
+echo hello
+if test -t 1; then
+    # Stdout is a terminal.
+    exec >log
+else
+    # Stdout is not a terminal.
+    npipe=/tmp/$$.tmp
+    trap "rm -f $npipe" EXIT
+    mknod $npipe p
+    tee <$npipe log &
+    exec 1>&-
+    exec 1>$npipe
+fi
+echo goodbye
+</pre>
+===Create new image with kvm===
+Ref: http://www.cyberciti.biz/faq/kvm-virtualization-in-redhat-centos-scientific-linux-6/<br />
+Build an empty space for a CentOS virtual machine
+<pre>
+qemu-img create -f qcow2 centos.img 12G
+</pre>
+Tried creating image with
+<pre>
+sudo virt-install -n CentOS --description "Trying out CentOS" --ram=1024 --vcpus=1 --cpu host --hvm --cdrom /home/bey9at77/Downloads/c6-x86_64-20130910-1.qcow2 --graphics vnc --disk path=/var/lib/libvirt/images/centos.img,bus=virtio,size=10
+</pre>
+gives error
+<pre>
+Starting install...
+Allocating 'centos.img'                                                                                                                                                                                               |  10 GB     00:00
+ERROR    internal error Process exited while reading console log output: char device redirected to /dev/pts/1
+qemu-kvm: -drive file=/home/bey9at77/Downloads/c6-x86_64-20130910-1.qcow2.bz2,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw: could not open disk image /home/bey9at77/Downloads/c6-x86_64-20130910-1.qcow2: Permission denied
+</pre>
+===rpm / yum commands===
+====Install an RPM Package====
+<pre>
+rpm -ivh pidgin-2.7.9-5.el6.2.i686.rpm
+-i - install
+-v - verbose
+-h - print progress hashes
+</pre>
+====Check dependencies of RPM Package before Installing====
+<pre>
+rpm -qpR BitTorrent-5.2.2-1-Python2.4.noarch.rpm
+-q - query
+-p - list package capabilities
+-R - list dependent package capabilities
+</pre>
+====Install RPM Package with all dependencies====
+<pre>
+yum install BitTorrent-5.2.2-1-Python2.4.noarch.rpm
+</pre>
+====Install RPM Package with all dependencies (when RPM has been downloaded to local machine)====
+<pre>
+yum localinstall BitTorrent-5.2.2-1-Python2.4.noarch.rpm
+</pre>
+====Force Install a RPM Package without dependencies====
+Package will not work if dependencies are required
+<pre>
+rpm -ivh --nodeps BitTorrent-5.2.2-1-Python2.4.noarch.rpm
+</pre>
+====Check an Installed RPM Package====
+<pre>
+rpm -q BitTorrent
+</pre>
+====List all files of an installed RPM package====
+<pre>
+rpm -ql BitTorrent
+</pre>
+====List All Installed RPM Packages====
+<pre>
+rpm -qa
+</pre>
+====Query information about an installed RPM package====
+<pre>
+rpm -qi vsftpd
+</pre>
+====Query information about a not yet installed RPM package====
+<pre>
+rpm -qip sqlbuddy-1.3.3-1.noarch.rpm
+</pre>
+====(Forcibly) Remove an RPM Package====
+Use package name (as seen in -qi above), not full name
+<pre>
+rpm -ev (--nodeps) vsftpd
+</pre>
+====Query a file that was installed as part of an RPM Package (which package contained this file)====
+<pre>
+rpm -qf /usr/bin/htpasswd
+</pre>
+====Verify an RPM package====
+Compares information of installed files of the package against the rpm database
+<pre>
+rpm -Vp sqlbuddy-1.3.3-1.noarch.rpm
+</pre>
+====Rebuild corrupted RPM database====
+<pre>
+cd /var/lib
+rm __db*
+rpm --rebuilddb
+rpmdb_verify Packages
+</pre>
+===Install rpmforge repository===
+* Download rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
+* Import the key
+<pre>
+sudo rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt
+</pre>
+* Install the repository
+<pre>
+sudo rpm -i rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
+</pre>
+* Check the installation
+<pre>
+rpm -K rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
+</pre>
+* Test it
+<pre>
+sudo yum install terminator
+</pre>
 ===Install rpmfusion repository===
 <pre>
@@ Line 1,377: / Line 2,164: @@
 nameserver 192.168.1.1
 </pre>
+===Troubleshoot wireless network problems===
+* [https://www.blackmoreops.com/2014/09/18/connect-to-wifi-network-from-command-line-in-linux/ connect to wifi network from command-line in linux - from blackmoreops.com]
+'''Short summary of all the things you need to do in just few lines'''
+<pre>
+root@kali:~# iw dev
+root@kali:~# ip link set wlan0 up
+root@kali:~# iw wlan0 scan
+root@kali:~# wpa_passphrase blackMOREOps >> /etc/wpa_supplicant.conf
+root@kali:~# wpa_supplicant -i wlan0 -c /etc/wpa_supplicant.conf
+root@kali:~# iw wlan0 link
+root@kali:~# dhclient wlan0
+root@kali:~# ping 8.8.8.8
+(Where wlan0 is wifi adapter and blackMOREOps is SSID)
+(Add Routing manually)
+root@kali:~# ip route add default via 10.0.0.138 dev wlan0
+</pre>
 ===To change to static IP address (Redhat/CentOS)===
 As root:
@@ Line 1,402: / Line 2,206: @@
 nameserver 192.168.1.1
 </pre>
 ===Enable processes / services to start at boot time===
 <pre>

Difference between revisions of "Unix/Linux"

Latest revision as of 00:18, 6 December 2018

Contents

How to automatically download and process email attachments from Gmail[edit]

Useful references[edit]

Install tools[edit]

Configure fetchmail[edit]

Configure maildrop[edit]

uudeview[edit]

Use sed to repeat characters[edit]

Convert between lower and upper case using ansi standard[edit]

Use sed to delete the first line of a file or command output printing from the second line onwards[edit]

Use sed to munge a controlfile into submission![edit]

Find all files where a certain text does not exist[edit]

Use tar and gzip to copy files more efficiently across network between hosts[edit]

double hash and double percent in shell variables to trim off characters from variables[edit]

The best shell script ever. An example of how scripting should be done[edit]

split variable (eg. filename) into separate variables using set[edit]

Centre align text on a line in bash shell[edit]

Right justify text (or repeat characters) on a line with leader dots![edit]

cron jobs not submitted - daemon run out of child processes?[edit]

Find long-running processes with a cron job[edit]

Process command line arguments in shell[edit]

Carry XWindows settings across sessions[edit]

Cross-platform version of whoami[edit]

Set terminal title from command line[edit]

Remove blank lines and comments (also indented ones) from a file[edit]

Return elements of an array in Korn shell[edit]

A decent Unix Prompt[edit]

Simple arithmetic[edit]

Script encryption and passphrase protection[edit]

Virtual host configuration in Apache http.conf[edit]

Mount a website (or any other remote resource) locally using WebDav[edit]

Add current hostname to list of hosts on an xcat server[edit]

What is todays 'Day Of the Year' number?[edit]

Convert Julian day numbers to dates[edit]

Send crontab job output to a date formatted log file[edit]

Edit crontab file without crontab -e[edit]

Use shell to convert a number in scientific notation to normal[edit]

Check for jobs running longer that 24 hours[edit]

Global find and replace with perl (restricted to list of files provided by Unix find command)[edit]

perl function to make filenames lower case[edit]

From the management server, search the TNS listener port for each database on a server and make an inline substitution in the ITM config files![edit]

Run a job from cron every Nth day of the month[edit]

ps listing does not show start time after 24 hours[edit]

ps -ef cuts off args cmd column on Solaris[edit]

To see more than 80 characters of the last column on Solaris[edit]

To see more than 80 characters of the last column on AIX[edit]

Remove blank / empty lines from vi[edit]

Right pad a variable[edit]

Connect to a Windows server from Linux using rdesktop[edit]

Reset your password bypassing password rules[edit]

Sum the sizes of all files of an ls listing[edit]

Mount an iso image under Linux[edit]

How many processors on the machine?[edit]

Quick, simple, understandable example of how to use RRDTool[edit]

Use expect to respond automatically to interactive programs[edit]

Use expect to allow file copy with scp (if ssh keys are not an option)[edit]

Within a shell script set up simultaneous output to both terminal and a file using a FIFO (named pipes)[edit]

More elaborate example[edit]

RedHat root filesystem has gone read-only[edit]

Kill all processes for a user[edit]

isRGHere[edit]

AIX: add a user to a group[edit]

Find swear words in scripts by comparing it to a list found on the internet[edit]

grep -p (for paragraph) works on AIX but not on Linux or Solaris[edit]

debug/redirect log of a shell[edit]

Different ways of Iteration in korn shell with a while loop[edit]

Filesystem 100% full, what's taking up all the space?[edit]

Show paged memory hogs on AIX[edit]

Capitalise the first letter of a word in Korn Shell[edit]

Remove / rename a directory / file containing weird control characters[edit]

Run a local script on a remote host[edit]

Get a list of running instances - but only those started by the current user[edit]

Return a list of Oracle databases running on a list of remote servers[edit]

Clever trick to check whether SQL output needs sending to someone[edit]

Check RMAN logfiles for errors from cron every day[edit]

An alternative to getopts[edit]

Run a script on multiple servers[edit]

How can a shell script find out what directory it is in?[edit]