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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 [[BSD]] UNIX operating system; the [[LPRng]] project also supports that protocol. The [[Common Unix Printing System]] (or CUPS), which is more common on modern [[Linux]] distributions and also found on [[Mac OS X]], supports LPD as well as the [[Internet Printing Protocol|Internet Printing Protocol (IPP)]]. Commercial solutions are available that also use Berkeley printing protocol components, where more robust functionality and performance is necessary than is available from LPR/LPD (or CUPS) alone (such as might be required in large corporate environments). The LPD Protocol Specification is documented in RFC 1179.<ref>[http://www.rfc-editor.org/rfc/rfc1179.txt RFC1179] Line Printer Daemon Protocol, August 1990, edited by L. McLaughlin III.</ref>
==Usage ==
A server for the LPD protocol listens for requests on TCP port 515. A request begins with a byte containing the request code, followed by the arguments to the request, and is terminated by an ASCII [[Newline|LF]] character.
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A printer that supports LPD/LPR is sometimes referred to as a "TCP/IP printer" ([[Internet protocol suite|TCP/IP]] is used to establish connections between printers and clients on a network), although that term would be equally applicable to a printer that supports the Internet Printing Protocol.
==See also ==
*[[Lp (Unix)]]
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*[[Foomatic]]
==References ==
{{Reflist}}
==External links ==
* [https://www.freebsd.org/cgi/man.cgi?query=lpd&sektion=8 FreeBSD LPD Man Page]
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