You can print different types of files (such as PostScript, PDF, plain text and images) on the printers or MFP devices directly from the command line interface. The CUPS lpr utility allows you do that. But Unified Linux Driver package replaces standard lpr tool by much more user friendly GUI LPR program.
To print a document file, type lpr <file_name> from Linux shell command line and press Enter. The GUI LPR dialog appears.
If you type only lpr and press Enter the Select file(s) to print dialog appears first. Select a file you want to print and click the Open button.
In the GUI LPR dialog, select the desired printer from the list and edit the printer and print job properties. Click the Ok button to start printing.
GUI LPR supports all command line arguments like the standard lpr printing utility. See the syntax of lpr command line in the Linux system help (e.g. using man lpr command). There is only one specific option: use -o ui=False to run GUI LPR without any GUI (exactly like standard lpr utility).
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