shell-command-on-region. With a prefix argument it replaces the region with the shell command's output. Great way to run Perl one-liners on whatever you're editing!

Also, align-regexp. Ideal for picky types who want a bunch of assignments to line up on the =. ;)

In reply to Re: Favorite Hacks in Emacs by Porculus
in thread Favorite Hacks in Emacs by jaschwartz

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