Berkeley printing system

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The Berkeley printing system is one of several standard architectures for printing on the Unix platform.^[1] It originated in 2.10BSD,^{[citation needed]} and is still used to varying degrees in BSD derivatives such as FreeBSD,^[2][3] NetBSD,^[4] OpenBSD,^[5] and DragonFly BSD.^[6][7] 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.^[1][8][9]

Typical user commands available to the Berkeley print system are:

• lpr — the user command to assign a job to the print queue^[1][8]
• lpq — shows the current print queue^[1][8]
• lprm — deletes a job from the print queue^[1][8]

The lpd program is the daemon with which those programs communicate.^[1]

These programs support the line printer daemon protocol, so that other machines on a network can submit jobs to a print queue on a machine running the Berkeley printing system, and so that the Berkeley printing system user commands can submit jobs to machines that support that protocol.^[1][10]