Sonal, try typing in the following command:
which oracle
It
should be listed under oracle. (If not, ask the sysadmin, who should always know what's on the box). If it is there,
you should get back a single location. Otherwise, you'll get back something like:
no oracle in /usr/bin /usr/local/bin /......
and it will list all the directories in your $PATH.
Hope that helps.