in reply to Favourite One-liners?

perl -pi~ -e 's/foo/bar/' *.xyz

I often have to go through a list of files and make minor tweaks to them. And we're talking about 150-200 files. It blows my coworkers' minds away that I can do search&replace that quickly.

IIRC, this is actually what got me started on perl in the first place. I am waaaay too lazy.