Optimize images

commands.sh

# The tools
sudo apt install libjpeg-progs optipng

# Compress jpg
jpegtran -copy none -optimize -perfect -outfile output.jpg input.jpg

# Compress png
optipng -o7 *.png

optimize-images.sh

#!/bin/sh

# Copied from https://gist.github.com/iimos/7424025

# Usage 1:
# optimize-images.sh /images/dir
# 
# Usage 2:
# cd /images/dir
# optimize-images.sh 

EXTENSIONS="jpe?g"

if [ -z "$1" ]; then
  DIR="`pwd`"
else
  DIR="$1"
fi

# Optimize JPEG images
find "$DIR" -regextype posix-egrep -regex ".*\.($EXTENSIONS)\$" -type f | xargs -I{} jpegtran -optimize -progressive -outfile "{}" "{}"