How to optimize jpeg files in Ubuntu terminal?

As you know the jpg files made by digital camera very often are large size. If you want easily to optimize jpeg files in Ubuntu terminal, you should install jpegoptim application:

sudo apt-get install jpegoptim

Usage this app is very simple. Copy all files you want to compress/optimize to a folder and then make a command from terminal (when you are in this folder of course):

 jpegoptim *.JPG --max=50

This command will change the quality of jpg files (and size of files too). Remember about correct extension of the files! *.JPG is not *.jpg (capital and small letters).