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Linux work with images in CLI

Compress

JPG

apt-get install jpegoptim

we only remove unnecessary information, efficiency 5-10% 

find /path/to/ -name *.jpg | xargs jpegoptim -s
reduction by 20-80% 
find /path/to/ -name *.jpg | xargs jpegoptim -s -m50

PNG

apt-get install optipng

find /path/to/ -name *.png | xargs optipng

overwrites the file - you need to change the owner does not understand Cyrillic in file names!!! 

chown -R www-data:www-data /path/to/

Best way - convert PNG to JPG 

ls -1 *.png | xargs -n 1 bash -c 'convert "$0" "${0%.*}.jpg"'