For Linux users (and probably Mac, and other *nix systems), one of the best programs for quick and easy photo manipulation is the shareware xv program.
Yeah... I used to love xv, but I lost track of it a long time ago, simply because it wasn't
apt-get-able.
If you want fully free, then I'd suggest
GraphicsMagick's
convert or
mogrify, though if you prefer seeing what's happening visually,
display has keyboard shortcuts that let you avoid mousing, too. A little less light-weight than xv, but with the extra power, I prefer it.
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