Perl - List installed Perl modules using perldoc

-- Using perldoc

There are 2 commands, depending of the kind of perl module:

'perldoc perlmodlib' list the modules that come preinstalled with the standard perl package.

perldoc perllocal' lists the optional modules that are installed in your system that don't come with perl by default.

source:

http://www.perlhowto.com/list_the_installed_modules