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sips is a handy image-manipulation command line thingy. For example, to rotate an image 90° clockwise, open up the Terminal and type sips -r 90 thenameofyourfile.jpg. Much quicker than opening up a proper graphics application (and much better than using Preview, which I tend to do, only to kick myself when I remember it alters the EXIF orientation tag for the file, not the file itself). Meta-tip for non command liners: type sips --help for, um, help using sips.
# images, manipulation, rotate