How-to compress image jpeg on Linux ?
Example on Ubuntu
sudo apt install jpegoptim
compress by 90% with 4CPU with preserve permissions in same directory
find . -type f -iname "*.jpg" -print0 | xargs -0 -n 10 -P 4 jpegoptim -tp -m 90
compress by 90% with 4CPU with preserve permissions in dest directory
find . -type f -iname "*.jpg" -print0 | xargs -0 -n 10 -P 4 jpegoptim -tp -m 90 -d /temp/