The <code>lpr</code> command is used on many Unix-like systems to assign jobs to printer queues. The name derives from line printer, though it has become the commonly used command for any sort of printer. The command originally appeared as part of the Berkeley printing system, and for some time served as a shibboleth to distinguish between System V and BSD systems. <code>lpr</code> is the standard name for the BSD printer command. It is also the standard name for the printer command in the LPRng project. The Common Unix Printing System, used on Linux and Mac OS X among other systems, provides an <code>lpr</code> command for compatibility with BSD systems.
Microsoft Windows provides an <code>lpr</code> command that prints to printers supporting the Line Printer Daemon protocol.
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