Create Icns from image file with shell script

icnsutil

#!/bin/sh
if [[ "$#" -lt 2 ]]; then
  echo "usage: icnsutil /path/to/1024x1024image"
  exit 1
fi
PIC=$1
PIC_FOLDER="$(dirname "$PIC")"
ICONSET_FOLDER="$PIC_FOLDER/icons.iconset"
ICNS_PATH="$PIC_FOLDER/Icon.icns"
mkdir -p $ICONSET_FOLDER

{
  sips -z 16 16       $PIC --out icons.iconset/icon_16x16.png
  sips -z 32 32       $PIC --out icons.iconset/[email protected]
  sips -z 32 32       $PIC --out icons.iconset/icon_32x32.png
  sips -z 64 64       $PIC --out icons.iconset/[email protected]
  sips -z 64 64       $PIC --out icons.iconset/icon_64x64.png
  sips -z 128 128     $PIC --out icons.iconset/[email protected]
  sips -z 128 128     $PIC --out icons.iconset/icon_128x128.png
  sips -z 256 256     $PIC --out icons.iconset/[email protected]
  sips -z 256 256     $PIC --out icons.iconset/icon_256x256.png
  sips -z 512 512     $PIC --out icons.iconset/[email protected]
  sips -z 512 512     $PIC --out icons.iconset/icon_512x512.png
  sips -z 1024 1024   $PIC --out icons.iconset/[email protected]
} &> /dev/null #for slient output

iconutil -c icns $ICONSET_FOLDER -o $ICNS_PATH