little script for optimizing images

optimize_octopress_media.sh

#!/bin/bash

# tools needed: optipng, libjpeg for libtrans and gifsicle

MEDIAFOLDER=~/Development/octopress/source/media
MEMORYFILE=$MEDIAFOLDER/.optimized

for img in $MEDIAFOLDER/*.{png,jpg,jpeg,gif}; do
  if [ `grep $img $MEMORYFILE 2>/dev/null | wc -l` -eq 0 ]; then
    if [[ $img =~ \.png$ ]]; then
      /usr/local/bin/optipng -o7 $img
    elif [[ $img =~ \.(jpg|jpeg)$ ]]; then
      /usr/local/bin/jpegtran -optimize -outfile $img $img
    elif [[ $img =~ \.gif$ ]]; then
      /usr/local/bin/gifsicle --optimize=2 --no-warnings --batch $img
    fi
    echo $img >> $MEMORYFILE
  fi
done