badpeg.sh sell script for validating jpeg files using imagemagick. Adds a hyphen to the end of the filename if the test fails.

gistfile1.txt

#!/bin/sh
# rename bat jpg files
# usage with large number of files 
# cd to the directory containing the images
## ls ./ | xargs badpeg.sh

for filename in "$@"
do
#lastPix=`convert $filename -format "%[pixel: u.p{699,465}]" info:`
#echo $lastPix
if [[ `convert $filename -format "%[pixel: u.p{699,465}]" info:` == fractal ]]
then
mv $filename $filename"-"
echo $filename is a bad jpeg
fi
done