So here's the deal, i have a folder full of pictures that i wanna post on facebook, but all the pictrues there are huge (723x482)...So im gonna have to make them smaller. So here goes my question, is there any way i can get all the pictures on that folder and resize them all at once?
"Where the Beatles wanted to hold your hand, the Stones wanted to fuck your sister or daughter"

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Mac or linux:

mogrify -resize WIDTHxHEIGHT *.jpg

Where those are the max width/height. Note that aspect ratio is preserved.