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<th colspan="3" align="center">LPRng Reference Manual: 24
Sep 2004 (For LPRng-3.8.28)</th>
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<td width="80%" align="center" valign="bottom">Chapter 19.
RFC 1179 - Line Printer Daemon Protocol</td>
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<div class="SECT1">
<h1 class="SECT1"><a name="LPCREREAD" id="LPCREREAD">19.8. LPC
Requests</a></h1>
<p><b class="APPLICATION">LPRng</b> has extended the RFC1179
protocol to allow queue and printer control commands to be sent
to the <b class="APPLICATION">lpd</b> server. The format of
these commands are:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN10571" id="AEN10571"></a>
<pre class="SCREEN">
\006printer user key [options]
</pre>
</div>
<p>The following commands are supported.</p>
<div class="TABLE">
<a name="LPCCOMMANDS" id="LPCCOMMANDS"></a>
<p><b>Table 19-3. LPC Commands</b></p>
<table border="1" frame="border" rules="all" class=
"CALSTABLE">
<col>
<col>
<thead>
<tr>
<th>Command</th>
<th>Operation</th>
</tr>
</thead>
<tbody>
<tr>
<td>Command</td>
<td>Operation</td>
</tr>
<tr>
<td><tt class="LITERAL">active
[printer[@host]]</tt></td>
<td>check to see if server accepting connections</td>
</tr>
<tr>
<td><tt class="LITERAL">abort (printer[@host] |
all)</tt></td>
<td>terminate server process printing job</td>
</tr>
<tr>
<td><tt class="LITERAL">disable (printer[@host] |
all)</tt></td>
<td>disable queueing</td>
</tr>
<tr>
<td><tt class="LITERAL">debug (printer[@host] | all)
debugparms</tt></td>
<td>set debug level for printer</td>
</tr>
<tr>
<td><tt class="LITERAL">enable (printer[@host] |
all)</tt></td>
<td>enable queueing</td>
</tr>
<tr>
<td><tt class="LITERAL">hold (printer[@host] | all)
(name[@host] | job | all)*</tt></td>
<td>hold job</td>
</tr>
<tr>
<td><tt class="LITERAL">holdall (printer[@host] |
all)</tt></td>
<td>hold all jobs on</td>
</tr>
<tr>
<td><tt class="LITERAL">kill (printer[@host] |
all)</tt></td>
<td>stop and restart server</td>
</tr>
<tr>
<td><tt class="LITERAL">lpd [printer[@host]]</tt></td>
<td>get <b class="APPLICATION">lpd</b> PID for
server</td>
</tr>
<tr>
<td><tt class="LITERAL">lpq (printer[@host] | all)
(name[@host] | job | all)*</tt></td>
<td>invoke <b class="APPLICATION">lpq</b></td>
</tr>
<tr>
<td><tt class="LITERAL">lprm (printer[@host] | all)
(name[@host]|host|job| all)*</tt></td>
<td>invoke <b class="APPLICATION">lprm</b></td>
</tr>
<tr>
<td><tt class="LITERAL">move printer (user|jobid)*
target</tt></td>
<td>move jobs to new queue</td>
</tr>
<tr>
<td><tt class="LITERAL">noholdall (printer[@host] |
all)</tt></td>
<td>hold all jobs off</td>
</tr>
<tr>
<td><tt class="LITERAL">printcap (printer[@host] |
all)</tt></td>
<td>report printcap values</td>
</tr>
<tr>
<td><tt class="LITERAL">quit</tt></td>
<td>exit LPC</td>
</tr>
<tr>
<td><tt class="LITERAL">redirect (printer[@host] | all)
(printer@host | off )*</tt></td>
<td>redirect jobs</td>
</tr>
<tr>
<td><tt class="LITERAL">release (printer[@host] | all)
(name[@host] | job | all)*</tt></td>
<td>release job</td>
</tr>
<tr>
<td><tt class="LITERAL">reread
[printer[@host]]</tt></td>
<td><b class="APPLICATION">lpd</b> reread database
information</td>
</tr>
<tr>
<td><tt class="LITERAL">start (printer[@host] |
all)</tt></td>
<td>start printing</td>
</tr>
<tr>
<td><tt class="LITERAL">status (printer[@host] |
all)</tt></td>
<td>status of printers</td>
</tr>
<tr>
<td><tt class="LITERAL">stop (printer[@host] |
all)</tt></td>
<td>stop printing</td>
</tr>
<tr>
<td><tt class="LITERAL">topq (printer[@host] | all)
(name[@host] | job | all)*</tt></td>
<td>reorder job</td>
</tr>
<tr>
<td><tt class="LITERAL">defaultq</tt></td>
<td>default queue for <b class="APPLICATION">lpd</b>
server</td>
</tr>
<tr>
<td><tt class="LITERAL">local (printer | all)</tt></td>
<td>client printcap and configuration information</td>
</tr>
<tr>
<td><tt class="LITERAL">server (printer |
all)</tt></td>
<td>server printcap and configuration information</td>
</tr>
</tbody>
</table>
</div>
<p>Many of these commands support extremely specialized
operations for print queue management, However, the following
are the most commonly used and are supported by the BSD
<b class="APPLICATION">lpd</b> print spooling system as
well:</p>
<ul>
<li>
<p><tt class="LITERAL">start, stop, enable, disable</tt>
Start and stop will start and stop printing for a specified
queue. Enable and disable enable and disable sending and/or
accepting jobs for the queue.</p>
</li>
<li>
<p><tt class="LITERAL">abort, kill</tt> Abort will cause
the process doing the actual job printing to be terminated.
Kill does an abort, and then restarts the printing process.
These commands are used to restart a queue printing after
some disaster.</p>
</li>
<li>
<p><tt class="LITERAL">topq</tt> Places selected jobs at
the top of the print queue.</p>
</li>
<li>
<p><tt class="LITERAL">status</tt> Shows a status display
of the print spools on the server.</p>
</li>
</ul>
<p>The following commands are extensions to the basic set
provided by the BSD <b class="APPLICATION">lpd</b> system.</p>
<ul>
<li>
<p><tt class="LITERAL">lpq, lprm</tt> Invokes the lpq or
lprm program from lpc. Useful when in the interactive
mode.</p>
</li>
<li>
<p><tt class="LITERAL">hold, holdall, release</tt> The hold
command will cause the selected jobs to be held until
released. The holdall jobs sets all jobs submitted to the
queue to be held until released. The release command
releases jobs for printing. If a job has had an error and
is in the error state, the release command will cause it to
be reprinted.</p>
</li>
<li>
<p><tt class="LITERAL">move, redirect</tt> The move command
will move selected jobs to the specified spool queue. The
redirect command sends all jobs submitted to the queue to
be sent to the specified queue.</p>
</li>
<li>
<p><tt class="LITERAL">active, lpd, reread</tt> The active
command will connect to the server for the printer. This is
used to check to see if non-<b class=
"APPLICATION">LPRng</b> print servers are active. The lpd
command will connect to the server and get the process id
(PID) of the <b class="APPLICATION">lpd</b> server. The
reread command causes a SIGHUP signal to be sent to the lpd
process, causing it to reread the <tt class=
"FILENAME">lpd.conf</tt>, <tt class=
"FILENAME">printcap</tt>, and <tt class=
"FILENAME">lpd.perms</tt> files. This is done when
configuration information has been modified and the
administrator wants to have the server use the new
information.</p>
</li>
<li>
<p><tt class="LITERAL">debug</tt> This is a desperation
facility for developers that allows dynamic enabling of
debug information generation. Not normally used in general
operation.</p>
</li>
<li>
<p><tt class="LITERAL">local, server</tt> These commands
will print out the configuration information in the local
<tt class="FILENAME">lpd.conf</tt> file, as well as the
printcap information for the specified printers; <tt class=
"LITERAL">client</tt> prints what the <b class=
"APPLICATION">LPRng</b> clients (<tt class="LITERAL">lpr,
lpq, ...</tt>) would use while <tt class=
"LITERAL">server</tt> prints what the <b class=
"APPLICATION">LPRng</b> server (<b class=
"APPLICATION">lpd</b>) would use if running on this host.
This is an extremely useful diagnostic tool for
administrators. Not normally used in general operation.</p>
</li>
</ul>
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