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.
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Meditations