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The Line Printer Daemon protocol/Line Printer Remote protocol (or LPD, LPR) is a network printing protocol for submitting print jobs to a remote printer. The original implementation of LPD was in the Berkeley printing system in the BSD UNIX operating system; the LPRng project also supports that protocol.
A system running this print architecture could traditionally be identified by the use of the user command lp as the primary interface to the print system, as opposed to the BSD lpr command (though some systems provide lpr as an alias to lp). Typical user commands available to the System V printing system are: lp: the user command to print a ...
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: lpr — the user command to print; lpq — shows the current print queue
The Line Printer Daemon protocol/Line Printer Remote protocol (or LPD, LPR) is a network protocol for submitting print jobs to a remote printer. The original implementation of LPD was in the Berkeley printing system in the 2.10 BSD UNIX operating system in 1988; the LPRng project also supports that protocol.
LPRng is an open-source printing system compatible with the Berkeley printing system and implemented by many open-source Unix-like operating systems. It provides printer spooling and network print server functionality using the Line Printer Daemon protocol.
Michael Sweet, who owned Easy Software Products, started developing CUPS in 1997 and the first public betas appeared in 1999. [4] [5] The original design of CUPS used the Line Printer Daemon protocol (LPD), but due to limitations in LPD and vendor incompatibilities, the Internet Printing Protocol (IPP) was chosen instead.
The print command allowed specifying one of many possible local printer interfaces, [23] and could make use of networked printers using the net command. [24] A maximum number of files and a maximum buffer size could be specified, and further command-line options allowed adding and removing files from the queue. [23]
Under DOS and UNIX printing a file can be done with redirection; under UNIX it is normally done by spooling the file to the "line printer" (using the lpr command) because UNIX is conventionally a multi-user system. TRSDOS/LS-DOS 6.x print jobs can be redirected (such as to a disk file) by applying the LINK or ROUTE commands to the system *PR ...