The Berkeley printing system is one of several standard architectures for printing on the Unix platform. It originated in , and is used in BSD derivatives such as FreeBSD, NetBSD, OpenBSD, and DragonFly BSD. A system running this print architecture could traditionally be identified by the use of the user command lpr as the primary interface to the print system, as opposed to the System V printing system lp command. Typical user commands available to the Berkeley print system are: The lpd program is the daemon with which those programs communicate.