Script to generate Retina conpatible iamge.

makeRetinaImages.sh

#!/bin/bash
# How to use
# $makeRetinaImages.sh folder_name
# The folder name should end by '/'.
#
for file in `ls $1`; do
    if expr "$file" : ".*\.png" >/dev/null; then
        file2x=`echo $file|sed 's/\(.*\)\(\.png\)/\1\@2x\2/'`
        mv $1$file $1$file2x
        convert -geometry 50% $1$file2x $1$file
    else
        echo "only support .png file"
    fi
done