Optimize PNG and JPEG images - incrementally

optimize_media.sh

#!/bin/bash
#
# Optimize all jpg and png files in the cwd
# Run it again to optimize new files since the last run
#
# Example:
#   echo "optimize_media.sh > /tmp/optimize.log" | sudo -u www-data bash -s
#
# Colin Mollenhour 2016

user=www-data
dir=$PWD
flag=$dir/.last-optimized
[ $(whoami) = "$user" ] || { echo "Use 'sudo -u $user' to run this script." >&2; exit 1; }
type optipng 2>&1 > /dev/null || { echo "optipng is not installed." >&2; exit 1; }
type jpegoptim 2>&1 > /dev/null || { echo "jpegoptim is not installed." >&2; exit 1; }
touch ${flag}-new || { echo "Cound not touch new flag file." >&2; exit 1; }
date; du -sh $dir
opts="-type f"
if [ -f "$flag" ]; then
 opts="$opts -newer $flag"
fi
find $dir $opts -iname '*.png' -not -path "*/watermark/*" \
  -exec optipng -o7 -preserve {} \;
find $dir $opts \( -iname '*\.jpg' -or -iname '*\.jpeg' \) \
  -exec jpegoptim --strip-all -p {} \; \
  -exec chmod 660 {} \;
date; du -sh $dir
mv ${flag}-new $flag