For the disease, see Laryngopharyngeal reflux

Laryngopharyngeal reflux

Laryngopharyngeal reflux , also extraesophageal reflux disease refers to retrograde flow of gastric contents to the upper aero-digestive tract, which causes a variety of symptoms, such as cough, hoarseness, and asthma, among others.Although heartburn is a primary symptom among people with...

.

The lpr command is used on many Unix-like

Unix-like

A Unix-like operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification....

 systems to assign jobs to printer queues. The name derives from "lineprinter", though it has become the commonly used command for any sort of printer. The command originally appeared as part of the Berkeley printing system

Berkeley printing system

The Berkeley printing system is one of several standard architectures for printing on the Unix platform. It originated in 4.2BSD, and is used in BSD derivatives such as FreeBSD, NetBSD, OpenBSD, and DragonFly BSD...

, and for some time served as a shibboleth

Shibboleth

A shibboleth is a custom, principle, or belief distinguishing a particular class or group of people, especially a long-standing one regarded as outmoded or no longer important...

 to distinguish between System V

UNIX System V

Unix System V, commonly abbreviated SysV , is one of the first commercial versions of the Unix operating system. It was originally developed by American Telephone & Telegraph and first released in 1983. Four major versions of System V were released, termed Releases 1, 2, 3 and 4...

 and BSD

Berkeley Software Distribution

Berkeley Software Distribution is a Unix operating system derivative developed and distributed by the Computer Systems Research Group of the University of California, Berkeley, from 1977 to 1995...

 systems.

• lpr is the standard name for the BSD printer
  Berkeley printing system
  The Berkeley printing system is one of several standard architectures for printing on the Unix platform. It originated in 4.2BSD, and is used in BSD derivatives such as FreeBSD, NetBSD, OpenBSD, and DragonFly BSD...
  
   command.
• It is also the standard name for the printer command in the LPRng
  LPRng
  LPRng is a printing system compatible with the Berkeley printing system. It provides printer spooling and network print server functionality using the Line Printer Daemon protocol....
  
   project.
• The Common Unix Printing System
  Common Unix Printing System
  CUPS is a modular printing system for Unix-like computer operating systems which allows a computer to act as a print server...
  
  , used on Linux
  Linux
  Linux is a Unix-like computer operating system assembled under the model of free and open source software development and distribution. The defining component of any Linux system is the Linux kernel, an operating system kernel first released October 5, 1991 by Linus Torvalds...
  
   and Mac OS X
  Mac OS X
  Mac OS X is a series of Unix-based operating systems and graphical user interfaces developed, marketed, and sold by Apple Inc. Since 2002, has been included with all new Macintosh computer systems...
  
   among other systems, provides an lpr command for compatibility with BSD systems.
• Microsoft Windows
  Microsoft Windows
  Microsoft Windows is a series of operating systems produced by Microsoft.Microsoft introduced an operating environment named Windows on November 20, 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces . Microsoft Windows came to dominate the world's personal...
  
   provides an lpr command that prints to printers supporting the Line Printer Daemon protocol.

External links

• http://www.linuxmanpages.com/man1/lpr.1.php The program's manpage as implemented on CUPS systems