Make all app icons with imagemagick, iOS and Android

prepare_icons.sh

#!/bin/sh
base=$1
folderName=$2

if [ -z $base ]; then
  echo No argument given
elif [ -z $folderName ]; then
  ##
  ## iOS files
  convert "$base" -resize 20x20!     "ios-Icon-20.png"
  convert "$base" -resize 29x29!     "ios-Icon-Small.png"
  convert "$base" -resize 40x40!     "ios-Icon-Small-40.png"
  convert "$base" -resize 50x50!     "ios-Icon-Small-50.png"
  convert "$base" -resize 57x57!     "ios-Icon.png"
  convert "$base" -resize 58x58!     "ios-Icon-Small@2x.png"
  convert "$base" -resize 87x87!     "ios-Icon-Small@3x.png"
  convert "$base" -resize 60x60!     "ios-Icon-60.png"
  convert "$base" -resize 72x72!     "ios-Icon-72.png"
  convert "$base" -resize 76x76!     "ios-Icon-76.png"
  convert "$base" -resize 80x80!     "ios-Icon-Small-40@2x.png"
  convert "$base" -resize 100x100!   "ios-Icon-Small-50@2x.png"
  convert "$base" -resize 114x114!   "ios-Icon@2x.png"
  convert "$base" -resize 120x120!   "ios-Icon-60@2x.png"
  convert "$base" -resize 144x144!   "ios-Icon-72@2x.png"
  convert "$base" -resize 152x152!   "ios-Icon-76@2x.png"
  convert "$base" -resize 83.5x83.5! "ios-Icon-83.5@2x.png"
  convert "$base" -resize 180x180!   "ios-Icon-60@3x.png"
  convert "$base" -resize 512x512!   "ios-iTunesArtwork"
  convert "$base" -resize 1024x1024! "ios-iTunesArtwork@2x"
  ##
  ## Android files
  convert "$base" -resize 36x36!    "android-Icon-ldpi.png"
  convert "$base" -resize 48x48!    "android-Icon-mdpi.png"
  convert "$base" -resize 72x72!    "android-Icon-hdpi.png"
  convert "$base" -resize 96x96!    "android-Icon-xhdpi.png"
  convert "$base" -resize 144x144!  "android-Icon-xxhdpi.png"
  convert "$base" -resize 192x192!  "android-Icon-xxxhdpi.png"
elif [[ -d "$folderName" && -L "$folderName" ]] ; then
  echo It is a symlink!
else
  # directory name provided and it is not symlink
  # create the folder if it does not exist
  # will also create any intermediate directories that don't exist
  mkdir -p $folderName
  ##
  ## iOS files
  convert "$base" -resize 20x20!     "$folderName/ios-Icon-20.png"
  convert "$base" -resize 29x29!     "$folderName/ios-Icon-Small.png"
  convert "$base" -resize 40x40!     "$folderName/ios-Icon-Small-40.png"
  convert "$base" -resize 50x50!     "$folderName/ios-Icon-Small-50.png"
  convert "$base" -resize 57x57!     "$folderName/ios-Icon.png"
  convert "$base" -resize 58x58!     "$folderName/ios-Icon-Small@2x.png"
  convert "$base" -resize 87x87!     "$folderName/ios-Icon-Small@3x.png"
  convert "$base" -resize 60x60!     "$folderName/ios-Icon-60.png"
  convert "$base" -resize 72x72!     "$folderName/ios-Icon-72.png"
  convert "$base" -resize 76x76!     "$folderName/ios-Icon-76.png"
  convert "$base" -resize 80x80!     "$folderName/ios-Icon-Small-40@2x.png"
  convert "$base" -resize 100x100!   "$folderName/ios-Icon-Small-50@2x.png"
  convert "$base" -resize 114x114!   "$folderName/ios-Icon@2x.png"
  convert "$base" -resize 120x120!   "$folderName/ios-Icon-60@2x.png"
  convert "$base" -resize 144x144!   "$folderName/ios-Icon-72@2x.png"
  convert "$base" -resize 152x152!   "$folderName/ios-Icon-76@2x.png"
  convert "$base" -resize 83.5x83.5! "$folderName/ios-Icon-83.5@2x.png"
  convert "$base" -resize 180x180!   "$folderName/ios-Icon-60@3x.png"
  convert "$base" -resize 512x512!   "$folderName/ios-iTunesArtwork"
  convert "$base" -resize 1024x1024! "$folderName/ios-iTunesArtwork@2x"
  ##
  ## Android files
  convert "$base" -resize 36x36!    "$folderName/android-Icon-ldpi.png"
  convert "$base" -resize 48x48!    "$folderName/android-Icon-mdpi.png"
  convert "$base" -resize 72x72!    "$folderName/android-Icon-hdpi.png"
  convert "$base" -resize 96x96!    "$folderName/android-Icon-xhdpi.png"
  convert "$base" -resize 144x144!  "$folderName/android-Icon-xxhdpi.png"
  convert "$base" -resize 192x192!  "$folderName/android-Icon-xxxhdpi.png"
fi