Some companies do actually have machines with multiple versions of Perl installed. Which one gets called depends on the environment settings at the time.

It is not uncommon to have an installation of Perl for command-line utilities, and one for web applications.

One sometimes has the situation where they do not have root/super access and they wish to install a version of Perl for themselves.

The clues as to which Perl gets called start at the application being run - what is the name of the file at the top of the file in the hash-bang statement? Is it /usr/bin/perl or /usr/local/perl/bin/perl or something else?

Next - what are the environment variables provided to the script that is being run? You might want to study your web server configuration files in depth.

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