This is part of the Emacs Starter Kit.
Helpers for the Perl programming language.
(eval-after-load 'cperl-mode
'(progn
(define-key cperl-mode-map (kbd "RET") 'reindent-then-newline-and-indent)
(define-key cperl-mode-map (kbd "C-M-h") 'backward-kill-word)))
(global-set-key (kbd "C-h P") 'perldoc)
(add-to-list 'auto-mode-alist '("\\.p[lm]$" . cperl-mode))
(add-to-list 'auto-mode-alist '("\\.pod$" . pod-mode))
(add-to-list 'auto-mode-alist '("\\.tt$" . tt-mode))