"which" command in Linux

which is a powerful command used in SSH environment to find out path of perl script, php executables, sendmail and many other linux utilities.

Try the following in SSH:

which php

>>> Results: /usr/local/bin/php
(Results will reflect according to your server settings)

which perl

>>> Results: /usr/local/bin/perl
(Results will reflect according to your server settings)

You can try this command for sendmail and other script locations.
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