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The mogrify command is also part of the ImageMagick suite, and is made to make changes to files in place.
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Requires ImageMagick to be installed; mogrify is the lesser-known sibling to convert -- it overwrites your original images, but allows you to work on batches of files without resorting to a loop.
Resize all png in the current folder.
Warning: no copy. Make sure you have a copy of the originals
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