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<head>
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  <title>LPC Requests</title>
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<body class="SECT1" bgcolor="#FFFFFF" text="#000000" link="#0000FF"
vlink="#840084" alink="#0000FF">
  <div class="NAVHEADER">
    <table summary="Header navigation table" width="100%" border=
    "0" cellpadding="0" cellspacing="0">
      <tr>
        <th colspan="3" align="center">LPRng Reference Manual: 24
        Sep 2004 (For LPRng-3.8.28)</th>
      </tr>

      <tr>
        <td width="10%" align="left" valign="bottom"><a href=
        "x10550.htm" accesskey="P">Prev</a></td>

        <td width="80%" align="center" valign="bottom">Chapter 19.
        RFC 1179 - Line Printer Daemon Protocol</td>

        <td width="10%" align="right" valign="bottom"><a href=
        "sendblockformat.htm" accesskey="N">Next</a></td>
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  </div>

  <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>
  </div>

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