Bash function to grab an app's icon

geticon.sh

#!/bin/bash
# Lovingly ripped off from Brett Terpstra.
# http://brettterpstra.com/grabbing-a-mac-apps-icon-advanced-bash-usage-2/

function geticon() {
  APP=`echo $1|sed -e 's/\.app$//'`
  APPDIR=''
  for dir in "/Applications/" "/Applications/Utilities/" "/Developer/Applications/" "/Developer/Applications/Utilties/"; do
    if [[ -d ${dir}$APP.app ]]; then 
        APPDIR=$dir
        break
    fi
  done
  if [[ $APPDIR == '' ]]; then
    echo "App not found"
  else
    ICON=`defaults read "${APPDIR}$APP.app/Contents/Info" CFBundleIconFile|sed -e 's/\.icns$//'`
    OUTFILE="$HOME/Desktop/${APP}_icon.jpg"
    MAXAVAIL=`sips -g pixelWidth "${APPDIR}$APP.app/Contents/Resources/$ICON.icns"|tail -1|awk '{print $2}'`
    echo -n "Enter max pixel width ($MAXAVAIL): "
  	read MAX
  	if [[ $MAX == '' || $MAX -gt $MAXAVAIL ]]; then
  	  MAX=$MAXAVAIL
  	fi
    /usr/bin/sips -s format jpeg --resampleHeightWidthMax $MAX "${APPDIR}$APP.app/Contents/Resources/$ICON.icns" --out "$OUTFILE" > /dev/null 2>&1
    echo "Wrote JPEG to $OUTFILE."
  	echo -n 'Open in Preview? (y/N): '
  	read ANSWER
  	if [[ $ANSWER == 'y' ]]; then
  	  open -a "Preview.app" "$OUTFILE"
  	fi
  fi
}