➜  markdown git:(master) which pngmin
pngmin: aliased to source ~/myconf/markdown/pngmin.sh
➜  markdown git:(master) cat ~/myconf/markdown/pngmin.sh
#!/bin/bash
echo "scan large png (1M+) ..."
find $1 -name "*.png" -size +1M
echo "---"
echo "compress ..."
find $1 -name "*.png" -size +1M -exec pngquant -f --ext .png {} \;
echo "---"
echo "after compressed: "
find $1 -name "*.png" -mmin -3
➜  markdown git:(master)