.\" Copyright (c) 1983, 1993.\"	The Regents of the University of California.  All rights reserved..\".\" Redistribution and use in source and binary forms, with or without.\" modification, are permitted provided that the following conditions.\" are met:.\" 1. Redistributions of source code must retain the above copyright.\"    notice, this list of conditions and the following disclaimer..\" 2. Redistributions in binary form must reproduce the above copyright.\"    notice, this list of conditions and the following disclaimer in the.\"    documentation and/or other materials provided with the distribution..\" 3. All advertising materials mentioning features or use of this software.\"    must display the following acknowledgement:.\"	This product includes software developed by the University of.\"	California, Berkeley and its contributors..\" 4. Neither the name of the University nor the names of its contributors.\"    may be used to endorse or promote products derived from this software.\"    without specific prior written permission..\".\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION).\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF.\" SUCH DAMAGE..\".\"	@(#)2.t	8.1 (Berkeley) 6/8/93.\".NH 1Commands.NH 2lpd \- line printer daemon.PPThe program.IR lpd (8),usually invoked at boot time from the /etc/rc file, acts asa master server for coordinating and controllingthe spooling queues configured in the printcap file.When.I lpdis started it makes a single pass through the.I printcapdatabase restarting any printers that have jobs.In normal operation.I lpdlistens for service requests on multiple sockets,one in the UNIX domain (named ``/dev/printer'') forlocal requests, and one in the Internet domain(under the ``printer'' service specification)for requests for printer access from off machine;see \fIsocket\fP\|(2) and \fIservices\fP\|(5)for more information on sockets and servicespecifications, respectively..I Lpdspawns a copy of itself to process the request; the master daemoncontinues to listen for new requests..PPClients communicate with .I lpdusing a simple transaction oriented protocol.Authentication of remote clients is done basedon the ``privilege port'' scheme employed by\fIrshd\fP\|(8C) and \fIrcmd\fP\|(3X).The following table shows the requests understood by.IR lpd .In each request the first byte indicates the``meaning'' of the request, followed by the nameof the printer to which it should be applied.  Additionalqualifiers may follow, depending on the request..DS.TSl l.Request	Interpretation_^Aprinter\en	check the queue for jobs and print any found^Bprinter\en	receive and queue a job from another machine^Cprinter [users ...] [jobs ...]\en	return short list of current queue state^Dprinter [users ...] [jobs ...]\en	return long list of current queue state^Eprinter person [users ...] [jobs ...]\en	remove jobs from a queue.TE.DE.PPThe \fIlpr\fP\|(1) commandis used by users to enter a print job in a local queue and to notifythe local.I lpdthat there are new jobs in the spooling area..I Lpdeither schedules the job to be printed locally, or ifprinting remotely, attempts to forwardthe job to the appropriate machine.If the printer cannot be opened or the destinationmachine is unreachable, the job will remain queued until it ispossible to complete the work..NH 2lpq \- show line printer queue.PPThe \fIlpq\fP\|(1)program works recursively backwards displaying the queue of the machine withthe printer and then the queue(s) of the machine(s) that lead to it..I Lpqhas two forms of output: in the default, short, format itgives a single line of output per queued job; in the long format it shows the list of files, and their sizes, thatcomprise a job..NH 2lprm \- remove jobs from a queue.PPThe \fIlprm\fP\|(1) command deletes jobs from a spoolingqueue.  If necessary, \fIlprm\fP will first kill off arunning daemon that is servicing the queue and restartit after the required files are removed.  When removingjobs destined for a remote printer, \fIlprm\fP actssimilarly to \fIlpq\fP except it first checks locallyfor jobs to remove and thentries to remove files in queues off-machine..NH 2lpc \- line printer control program.PPThe.IR lpc (8)program is used by the system administrator to control theoperation of the line printer system.  For each line printer configured in /etc/printcap,.I lpcmay be used to:.IP \(budisable or enable a printer,.IP \(budisable or enable a printer's spooling queue,.IP \(burearrange the order of jobs in a spooling queue,.IP \(bufind the status of printers, and their associatedspooling queues and printer daemons.