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LPR/LPD Protocol

The Berkeley versions of the Unix (TM) operating system provide line printer spooling with a collection of programs:

Lpr

Assign to queue

Lpq

Display the queue

Lprm

Remove from queue

Lpc

Control the queue

These programs interact with an autonomous process called the line printer daemon, which makes up the LPR/LPD protocol.

The section that follows describes the basic LPD commands, the LPD Job commands, and the LPD Control file. See the RFC 1179 for complete information.