Do you have a whole folder of image files (or PDFs) and you want to print out all of them?

Well, you don’t have to open each file individually in an image viewer and select File>Print. Linux command line magic sorts this out for you all at once. Just go to the folder where you’ve stored the images that you want to print and type the following command into the shell: lpr *

This will send all your image files from this folder to the default printer queue. If you want to check the status of all the printers assigned to your computer, just type lpr -t