Wrapper for pngcrush: removes almost all chunks, overwrites original file.

crush

#!/usr/bin/env bash
if [ $# -eq 0 ]
then
    echo "Usage: crush <pngfile(s)>"
    exit
fi

for img in "$@"
do
    pngcrush -force -rem allb -reduce -brute "$img" "${img%*.}crush.png"
    mv "${img%*.}crush.png" "$img"
done