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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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<h1 class="SECT1"><a name="QUEUECONTROLFILE" id=
"QUEUECONTROLFILE">13.3. Spool Control File</a></h1>
<ul>
<li>
<p><tt class="LITERAL">spool_control_file</tt><span class=
"emphasis"><i class="EMPHASIS">spool queue control file -
default control.%P</i></span></p>
</li>
</ul>
<p>The spool control file is used to control the operations of
the spooler, and is in the spool or control directory. The file
name specified by the <tt class=
"LITERAL">queue_control_file</tt> option (default <tt class=
"LITERAL">control.%P</tt> - the %P is expanded to the print
queue name); in our example, the control file would be:
<tt class="FILENAME">/var/lpd/pr/control.pr</tt>.</p>
<p>The <b class="APPLICATION">lpc</b> program sends spool
control requests to the <b class="APPLICATION">lpd</b> daemon,
which updates the control file and then signals the appropriate
spool server processes that an update has been performed. The
control file contents have the form:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN6368" id="AEN6368"></a>
<pre class="SCREEN">
key value
</pre>
</div>
<p>The following keys and their values are currently
supported.</p>
<div class="INFORMALTABLE">
<a name="AEN6371" id="AEN6371"></a>
<table border="1" frame="border" rules="all" class=
"CALSTABLE">
<col>
<col>
<col>
<thead>
<tr>
<th>Key</th>
<th>Value</th>
<th>Purpose</th>
</tr>
</thead>
<tbody>
<tr>
<td><tt class="LITERAL">printing_disabled</tt></td>
<td>0 or 1</td>
<td>disable printing of jobs in queue</td>
</tr>
<tr>
<td><tt class="LITERAL">spooling_disabled</tt></td>
<td>0 or 1</td>
<td>disable placing jobs in queue</td>
</tr>
<tr>
<td><tt class="LITERAL">holdall</tt></td>
<td>0 or 1</td>
<td>hold jobs until released</td>
</tr>
<tr>
<td><tt class="LITERAL">redirect</tt></td>
<td><tt class="LITERAL">printer</tt></td>
<td>transfer jobs to indicated printer</td>
</tr>
<tr>
<td><tt class="LITERAL">class</tt></td>
<td><tt class="LITERAL">glob expression</tt></td>
<td>print only jobs whose class matches glob
expression</td>
</tr>
<tr>
<td><tt class="LITERAL">server_order</tt></td>
<td><tt class="LITERAL">printer name list</tt></td>
<td>preferred order of printer use</td>
</tr>
<tr>
<td><tt class="LITERAL">debug</tt></td>
<td><tt class="LITERAL">debugging options</tt></td>
<td>debugging and tracing</td>
</tr>
</tbody>
</table>
</div>
<p>The <tt class="LITERAL">printing_disabled</tt> and
<tt class="LITERAL">spooling_disabled</tt> are managed using
the <tt class="COMMAND">lpc start</tt>, <tt class="COMMAND">lpc
stop</tt>, <tt class="COMMAND">lpc enable</tt> and <tt class=
"COMMAND">lpc disable</tt> commands. Similarly, <tt class=
"LITERAL">holdall</tt> is enabled and disabled by <tt class=
"LITERAL">holdall</tt> and <tt class="LITERAL">noholdall</tt>
commands respectively. When holdall is enabled, jobs placed in
the print queue will be held until they are explicitly released
for printing by an <tt class="COMMAND">lpc release</tt>
command.</p>
<p>The <tt class="LITERAL">redirect</tt> entry is used to
redirect or transfer jobs which are spooled to this queue to
another queue, and is managed by the redirect command. The
<tt class="COMMAND">lpc redirect off</tt> removes the redirect
entry from the control file.</p>
<p>The <tt class="LITERAL">class</tt> entry is similar in
operation to the <tt class="LITERAL">holdall</tt>, but allows
jobs whose class identification matches the glob expression to
be printed. This can be useful when you have special forms or
paper required for a print job, and want to run only these jobs
when the paper is in the printer.</p>
<p>The <tt class="LITERAL">server_order</tt> entry is created
and updated for a multiple printer queue. It records the order
in which printers should next be used for normal print
operations. This allows <span class="emphasis"><i class=
"EMPHASIS">round robin</i></span> use of printers, rather than
having all jobs printed to the first printer in the list of
printers.</p>
<p>The <tt class="LITERAL">debug</tt> entry is set by the
<tt class="COMMAND">lpc debug</tt> command, and is used to
enable or disable debugging and tracing information for a spool
queue. This facility is for diagnostic purposes only.</p>
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