I had a folder images I needed to resize, I used this shell script to do so.

gistfile1.sh

#!/bin/bash

#I had a folder images I needed to resize, I used this shell script to do so.

for f in *.JPG
do
   echo -n "Resizing $f... "
   convert $f -resize 256x256 s-$f
   mv s-$f small/
   echo "Done"
done