ImageMagick: Crop a batch of images using convert and the find command
# using a regular expression to find images such as "image01_abc.png", "image02_def.png", ...
find * -regextype "egrep" \
-iregex 'image[0-9][0-9].*' \
-exec convert {} -crop 800x600+0+0 "crop_{}" \;