Sometimes you may want to print files from the command line, especially when you have lots of them.
You can use lp for that.

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To print a single example.pdf file on your default printer, simply say:

lp example.pdf

lp accepts multiple filenames, so to print all PDF files in the current directory:

lp *.pdf

You can specify a printer via the -d switch:

lp -d YOUR_PRINTER_NAME *.pdf

Your printer's name is then one you defined on your system. You can check with your CUPS configuration by visiting http://localhost:631/printers. So, for example:

lp -d Brother-MFC-9840CDW *.pdf

Plain-text or PostScript files are also supported.