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Sep 2004 (For LPRng-3.8.28)</th>
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<h1 class="SECT1"><a name="SELECTINGPRINTQUEUE" id=
"SELECTINGPRINTQUEUE">4.6. Selecting the Print Queue</a></h1>
<p>In the previous section we used the default print queue. How
does <b class="APPLICATION">LPRng</b> determine what print
queue to use? First, you can explicitly specify the printer
using the <tt class="COMMAND">lpq -Pprintqueue</tt> option and
the <tt class="COMMAND">lpq -a</tt> or <tt class="COMMAND">lpq
-Pall</tt> to select all print queues:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN1951" id="AEN1951"></a>
<pre class="SCREEN">
<samp class="PROMPT">h4: {111} % </samp><kbd class=
"USERINPUT">lpq -Plp</kbd>
Printer: lp@h4
Queue: no printable jobs in queue
<samp class="PROMPT">h4: {112} % </samp><kbd class=
"USERINPUT">lpq -Plp2</kbd>
Printer: lp2@h4
Queue: no printable jobs in queue
<samp class="PROMPT">h4: {113} % </samp><kbd class=
"USERINPUT">lpq -a</kbd>
Printer: lp@h4
Queue: no printable jobs in queue
Printer: lp2@h4
Queue: no printable jobs in queue
</pre>
</div>
<p>You can combine the <tt class="COMMAND">lpq -a</tt> with the
<tt class="COMMAND">lpq -s</tt> option for a summary
listing:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN1962" id="AEN1962"></a>
<pre class="SCREEN">
<samp class="PROMPT">h4: {114} % </samp><kbd class=
"USERINPUT">lpq -a</kbd>
Printer: lp@h4
Queue: no printable jobs in queue
Printer: lp2@h4
Queue: no printable jobs in queue
<samp class="PROMPT">h4: {115} % </samp><kbd class=
"USERINPUT">lpq -s -a</kbd>
lp@h4 0 jobs
lp2@h4 0 jobs
</pre>
</div>
<p>There is another way to explicitly specify the printqueues
listed by <tt class="COMMAND">lpq -a</tt>; see the <a href=
"printcappath.htm#ALLPC"><tt class="LITERAL">all</tt> Printcap
Entry</a> for details.</p>
<p>Users can set their default printer by using the
<code class="ENVAR">PRINTER</code> (highest priority),
<code class="ENVAR">LPDEST</code> (next), <code class=
"ENVAR">NPRINTER</code> (next), and <code class=
"ENVAR">NGPRINTER</code> (lowest priority), environment
variables. For example:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN1977" id="AEN1977"></a>
<pre class="SCREEN">
<samp class="PROMPT">h4: {116} % </samp><kbd class=
"USERINPUT">setenv PRINTER lp2</kbd>
<samp class="PROMPT">h4: {117} % </samp><kbd class=
"USERINPUT">lpq</kbd>
Printer: lp2@h4
Queue: no printable jobs in queue
<samp class="PROMPT">h4: {118} % </samp><kbd class=
"USERINPUT">unsetenv PRINTER</kbd>
<samp class="PROMPT">h4: {119} % </samp><kbd class=
"USERINPUT">lpq</kbd>
Printer: lp@h4
Queue: no printable jobs in queue
</pre>
</div>
<p>If the printer is not specified on the command line or by
the environment variables, then the first printer in the
printcap database will be used and then the default printer in
the configuration database, and finally the compile time
default. <a href="lprngclients.htm#PRINTERINFO">Printer and
Server Information</a> for details.</p>
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