I am in terminal in Redhat 5.5 and I need to find out which version of Oracle is installed. I am pretty new at Linux, but I have searched Google for a while and I can't find what I need. I have to locate which version is installed via terminal. I found the Oracle files, but I can't seem to find the version.
As the user running the Oracle Database one can also try $ORACLE_HOME/OPatch/opatch lsinventory which shows the exact version and patches installed.
For example this is a quick oneliner which should only return the version number:
$ORACLE_HOME/OPatch/opatch lsinventory | awk '/^Oracle Database/ {print $NF}'