Rough Bash script for pulling icon files from Mac applications

grabicon.sh

#!/bin/bash

APP=`echo $1|sed -e 's/\.app$//'`
# Removes ".app" if it was passed

ICON=`defaults read /Applications/$APP.app/Contents/Info CFBundleIconFile|sed -e 's/\.icns$//'`
# Removes ".icns" if the Info.plist has it
# Harcoded for /Applications, needs to be rewritten for other locations or droplets

## Save icon on Desktop in JPEG format, resized to 256 max width/height

OUTFILE="$HOME/Desktop/${APP}_icon.jpg"
sips -s format jpeg --resampleHeightWidthMax 256 "/Applications/$APP.app/Contents/Resources/$ICON.icns" --out $OUTFILE
# Open in ImageOptim for better compression ( http://imageoptim.pornel.net/ )
open -a "ImageOptim.app" $OUTFILE

### OR ###

## Output file to a temp directory as a PNG and open in Skitch for resizing and conversion
# OUTFILE="$TMPDIR${APP}_icon.png"
# sips -s format png "/Applications/$APP.app/Contents/Resources/$ICON.icns" --out $OUTFILE
# open -a "Skitch.app" $OUTFILE