optipng / jpegoptim

jpegcompress.sh

#!/bin/bash

# combine mozjpeg and jpegoptim
# you have to build https://github.com/mozilla/mozjpeg first
#     path = /opt/mozjpeg
# ~# find . -iname "*.jp*g" -type f -exec jpegcompress "{}" \;

if [ -z "$1" ]; then
  echo "is empty"
  exit;
fi

export PATH=/opt/mozjpeg/bin/:$PATH
export LD_LIBRARY_PATH=/opt/mozjpeg/lib:$LD_LIBRARY_PATH

jpegtran -copy none -optimize -progressive -outfile "$@" "$@"

jpegoptim -o --strip-all --max=90 --all-progressive "$@"

jpegoptim-optipng.sh

#!/bin/bash

#JPEG
find . -iname "*.jp*g" -type f -exec jpegoptim -o --strip-all --max=90 --all-progressive "{}" \;

#PNG
find . -iname "*.png" -type f -exec optipng -o9 -strip all "{}" \;

For PNGs add "-strip all":
find . -iname "*.png" -type f -exec optipng -o9 -strip all "{}" \;

added :)