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.\" $OpenBSD: 2.t,v 1.2 1997/01/17 15:54:16 millert Exp $
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.\" Copyright (c) 1983, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" @(#)2.t 8.1 (Berkeley) 6/8/93
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lpd \- line printer daemon
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usually invoked at boot time from the /etc/rc file, acts as
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a master server for coordinating and controlling
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the spooling queues configured in the printcap file.
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is started it makes a single pass through the
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database restarting any printers that have jobs.
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listens for service requests on multiple sockets,
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one in the UNIX domain (named ``/dev/printer'') for
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local requests, and one in the Internet domain
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(under the ``printer'' service specification)
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for requests for printer access from off machine;
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see \fIsocket\fP\|(2) and \fIservices\fP\|(5)
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for more information on sockets and service
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specifications, respectively.
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spawns a copy of itself to process the request; the master daemon
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continues to listen for new requests.
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Clients communicate with
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using a simple transaction oriented protocol.
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Authentication of remote clients is done based
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on the ``privilege port'' scheme employed by
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\fIrshd\fP\|(8C) and \fIrcmd\fP\|(3X).
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The following table shows the requests
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In each request the first byte indicates the
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``meaning'' of the request, followed by the name
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of the printer to which it should be applied. Additional
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qualifiers may follow, depending on the request.
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Request Interpretation
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^Aprinter\en check the queue for jobs and print any found
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^Bprinter\en receive and queue a job from another machine
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^Cprinter [users ...] [jobs ...]\en return short list of current queue state
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^Dprinter [users ...] [jobs ...]\en return long list of current queue state
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^Eprinter person [users ...] [jobs ...]\en remove jobs from a queue
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The \fIlpr\fP\|(1) command
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is used by users to enter a print job in a local queue and to notify
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that there are new jobs in the spooling area.
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either schedules the job to be printed locally, or if
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printing remotely, attempts to forward
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the job to the appropriate machine.
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If the printer cannot be opened or the destination
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machine is unreachable, the job will remain queued until it is
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possible to complete the work.
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lpq \- show line printer queue
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program works recursively backwards displaying the queue of the machine with
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the printer and then the queue(s) of the machine(s) that lead to it.
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has two forms of output: in the default, short, format it
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gives a single line of output per queued job; in the long
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format it shows the list of files, and their sizes, that
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lprm \- remove jobs from a queue
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The \fIlprm\fP\|(1) command deletes jobs from a spooling
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queue. If necessary, \fIlprm\fP will first kill off a
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running daemon that is servicing the queue and restart
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it after the required files are removed. When removing
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jobs destined for a remote printer, \fIlprm\fP acts
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similarly to \fIlpq\fP except it first checks locally
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for jobs to remove and then
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tries to remove files in queues off-machine.
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lpc \- line printer control program
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program is used by the system administrator to control the
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operation of the line printer system.
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For each line printer configured in /etc/printcap,
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disable or enable a printer,
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disable or enable a printer's spooling queue,
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rearrange the order of jobs in a spooling queue,
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find the status of printers, and their associated
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spooling queues and printer daemons.
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SMM.doc/2.t
