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-.\" 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 1
-Commands
-.NH 2
-lpd \- line printer daemon
-.PP
-The program
-.IR lpd (8),
-usually invoked at boot time from the /etc/rc file, acts as
-a master server for coordinating and controlling
-the spooling queues configured in the printcap file.
-When
-.I lpd
-is started it makes a single pass through the
-.I printcap
-database restarting any printers that have jobs.
-In normal operation
-.I lpd
-listens for service requests on multiple sockets,
-one in the UNIX domain (named ``/dev/printer'') for
-local 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 service
-specifications, respectively.
-.I Lpd
-spawns a copy of itself to process the request; the master daemon
-continues to listen for new requests.
-.PP
-Clients communicate with
-.I lpd
-using a simple transaction oriented protocol.
-Authentication of remote clients is done based
-on 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 name
-of the printer to which it should be applied. Additional
-qualifiers may follow, depending on the request.
-.DS
-.TS
-l 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
-.PP
-The \fIlpr\fP\|(1) command
-is used by users to enter a print job in a local queue and to notify
-the local
-.I lpd
-that there are new jobs in the spooling area.
-.I Lpd
-either schedules the job to be printed locally, or if
-printing remotely, attempts to forward
-the job to the appropriate machine.
-If the printer cannot be opened or the destination
-machine is unreachable, the job will remain queued until it is
-possible to complete the work.
-.NH 2
-lpq \- show line printer queue
-.PP
-The \fIlpq\fP\|(1)
-program works recursively backwards displaying the queue of the machine with
-the printer and then the queue(s) of the machine(s) that lead to it.
-.I Lpq
-has two forms of output: in the default, short, format it
-gives a single line of output per queued job; in the long
-format it shows the list of files, and their sizes, that
-comprise a job.
-.NH 2
-lprm \- remove jobs from a queue
-.PP
-The \fIlprm\fP\|(1) command deletes jobs from a spooling
-queue. If necessary, \fIlprm\fP will first kill off a
-running daemon that is servicing the queue and restart
-it after the required files are removed. When removing
-jobs destined for a remote printer, \fIlprm\fP acts
-similarly to \fIlpq\fP except it first checks locally
-for jobs to remove and then
-tries to remove files in queues off-machine.
-.NH 2
-lpc \- line printer control program
-.PP
-The
-.IR lpc (8)
-program is used by the system administrator to control the
-operation of the line printer system.
-For each line printer configured in /etc/printcap,
-.I lpc
-may be used to:
-.IP \(bu
-disable or enable a printer,
-.IP \(bu
-disable or enable a printer's spooling queue,
-.IP \(bu
-rearrange the order of jobs in a spooling queue,
-.IP \(bu
-find the status of printers, and their associated
-spooling queues and printer daemons.
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