Create iOS icons in the needed sizes from one image on OS X

ios_icons

#!/bin/sh

# usage: ios_icons some_file.png
# output: creates images in needed sizes for iOS icon files
#         ex: some_file_SIZE.png

inf=$1

filename=$(basename "$inf")
ext="${filename##*.}"
fname="${filename%.*}"
echo "creating ${fname}_SIZE.{$ext}"

for i in 29 58 40 80 76 152  ; do
  sips -Z $i --out "${fname}_${i}.${ext}"  $inf
done