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<th colspan="3" align="center">LPRng-HOWTO: 1 Apr 2002
(For LPRng-3.8.10)</th>
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<h1 class="SECT1"><a name="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="AEN1900"></a>
<pre class="SCREEN">
<tt class="PROMPT">h4: {111} %</tt> <tt class=
"USERINPUT"><b>lpq -Plp</b></tt>
Printer: lp@h4
Queue: no printable jobs in queue
<tt class="PROMPT">h4: {112} %</tt> <tt class=
"USERINPUT"><b>lpq -Plp2</b></tt>
Printer: lp2@h4
Queue: no printable jobs in queue
<tt class="PROMPT">h4: {113} %</tt> <tt class=
"USERINPUT"><b>lpq -a</b></tt>
Printer: lp@h4
Queue: no printable jobs in queue
Printer: lp2@h4
Queue: no printable jobs in queue
</pre>
</div>
<br>
<br>
<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="AEN1911"></a>
<pre class="SCREEN">
<tt class="PROMPT">h4: {114} %</tt> <tt class=
"USERINPUT"><b>lpq -a</b></tt>
Printer: lp@h4
Queue: no printable jobs in queue
Printer: lp2@h4
Queue: no printable jobs in queue
<tt class="PROMPT">h4: {115} %</tt> <tt class=
"USERINPUT"><b>lpq -s -a</b></tt>
lp@h4 0 jobs
lp2@h4 0 jobs
</pre>
</div>
<br>
<br>
<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 <tt
class="ENVAR">PRINTER</tt> (highest priority), <tt class=
"ENVAR">LPDEST</tt> (next), <tt class="ENVAR">NPRINTER</tt>
(next), and <tt class="ENVAR">NGPRINTER</tt> (lowest
priority), environment variables. For example:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN1926"></a>
<pre class="SCREEN">
<tt class="PROMPT">h4: {116} %</tt> <tt class=
"USERINPUT"><b>setenv PRINTER lp2</b></tt>
<tt class="PROMPT">h4: {117} %</tt> <tt class=
"USERINPUT"><b>lpq</b></tt>
Printer: lp2@h4
Queue: no printable jobs in queue
<tt class="PROMPT">h4: {118} %</tt> <tt class=
"USERINPUT"><b>unsetenv PRINTER</b></tt>
<tt class="PROMPT">h4: {119} %</tt> <tt class=
"USERINPUT"><b>lpq</b></tt>
Printer: lp@h4
Queue: no printable jobs in queue
</pre>
</div>
<br>
<br>
<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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