How do I use perl-mode with Emacs?
A perl-mode comes with the Emacs distribution, and will be used when you load and edit Perl files. Users have also recommended an alternate mode named cperl-mode. This is installed with Emacs 21.3 – if you are running an older version of Emacs you can find it online at: http://www.emacswiki.org/cgi-bin/wiki/CPerlMode.