From http://www.novell.com/coolsolutions/tip/16524.html
mogrify -resize 320x240 *.jpg
After this command is completed, all of the images will be replaced with resized version of themselves. Notice that in an effort to preserve the image aspect ratio, mogrify may not be produce images that are exactly 320x240. To force this to happen, modify the original command to by placing an exclamation point at the end of the desired resolution:
mogrify -resize 320x240! *.jpg
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