Which databases are running on the machine
From dbawiki
From Unix
The 'uniq' should not be necessary!
ps -ef|grep [o]ra_pmon|sed -e 's/.*_//'|sort|uniq
From Windows
sc query | perl -00 -ne 'print "$1 $2\n" if /^SERVICE_NAME: OracleService(\w+).DISPLAY.+?STATE\s+:\s+\d\s+(\w+)/s'
