crush all the images!

crusher

#!/bin/bash

png() {
  w=$(mktemp)
  pngcrush -brute "$1" "$w"
  rm "$1"
  mv "$w" "$1"
  du -b "$1"
}

jpg() {
  jpegoptim "$1"
  du -b "$1"
}

gif() {
  gifsicle -O "$1" -o "$1"
  du -b "$1"
}

if [ -z "$1" ]; then
  echo 'Provide a directory to run compression against images.'
  exit 1
fi

for f in $(find "$1" -name '*.jpg' -or -name '*.jpeg' -or -name '*.png' -or -name '*.gif'); do
  filename=$(basename -- "$f")
  extension="${filename##*.}"
  if [ "$extension" = 'jpg' ]; then
    jpg "$f"
  elif [ "$extension" = 'png' ]; then
    png "$f"
  elif [ "$extension" = 'gif' ]; then
    gif "$f"
  fi
done