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<h1 class="SECT1"><a name="AEN3699" id="AEN3699">4.18. Routing
Jobs To Print Queues</a></h1>
<p>A <span class="emphasis"><i class="EMPHASIS">routing
queue</i></span> is similar in concept to a load balance queue
in that it transfers a job to a (different) print queue, but
the job destination is chosen at the time the job is submitted
to the queue rather than at the time the job is removed from
the queue. A routing queue can modify the job control file,
multiple copies of the same job can be sent to the same or
different printers, and the job can be held, rejected, or
processed immediately.</p>
<p>Edit the printcap file so it have the contents indicated
below, create the <tt class="FILENAME">/tmp/lp2</tt> and
<tt class="FILENAME">/tmp/lp3</tt> files with <tt class=
"LITERAL">0777</tt> permissions. Create the <tt class=
"FILENAME">/tmp/router.script</tt> with the contents indicated
below, and give it <tt class="LITERAL">0755</tt> (executable)
permissions. Use <tt class="COMMAND">checkpc -f</tt> to check
the printcap, and then use <tt class="COMMAND">lpc reread</tt>
to restart the <b class="APPLICATION">lpd</b> server.</p>
<div class="INFORMALEXAMPLE">
<a name="AEN3712" id="AEN3712"></a>
<pre class="SCREEN"># printcap
lp:force_localhost
lp:server
:lp=/dev/null
:sd=/var/spool/lpd/%P
:router=/tmp/router.script
lp2:force_localhost
lp2:server
:sd=/var/spool/lpd/%P
:lp=/tmp/lp2
lp3:force_localhost
lp3:server
:sd=/var/spool/lpd/%P
:lp=/tmp/lp2
# /tmp/router.script
#!/bin/sh
/bin/cat <<EOF
dest lp2
copies 2
Cred
end
dest lp3
end
EOF
exit 0</pre>
</div>
<p>The <tt class="FILENAME">router.script</tt> will write the
routing information to its <acronym class=
"ACRONYM">STDOUT</acronym>. For our example, we want the
destination <tt class="LITERAL">lp2</tt> to get two copies of
the job and we want to change the class to <tt class=
"LITERAL">red</tt>. Now run the following commands:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN3719" id="AEN3719"></a>
<pre class="SCREEN"><samp class=
"PROMPT">h4: {282} % </samp><kbd class=
"USERINPUT">lpc stop all</kbd>
Printer: lp@h4
lp@h4.private: stopped
Printer: lp2@h4
lp2@h4.private: stopped
Printer: lp3@h4
lp3@h4.private: stopped
<samp class="PROMPT">h4: {283} % </samp><kbd class=
"USERINPUT">lpq</kbd>
Printer: lp@h4 (dest lp@localhost) (printing disabled) (dest lp2, lp3)
Queue: no printable jobs in queue
Printer: lp2@h4 (printing disabled)
Queue: no printable jobs in queue
Printer: lp3@h4 (printing disabled)
Queue: no printable jobs in queue
<samp class="PROMPT">h4: {284} % </samp><kbd class=
"USERINPUT">lpr /tmp/hi</kbd>
<samp class="PROMPT">h4: {285} % </samp><kbd class=
"USERINPUT">lpq</kbd>
Printer: lp@h4 (dest lp@localhost) (printing disabled) (dest lp2, lp3)
Queue: 1 printable job
Server: no server active
Rank Owner/ID Class Job Files Size Time
1 papowell@h4+235 A 235 /tmp/hi 3 16:14:22
- papowell@h4+235.1 ->lp2 <cpy 0/2>
- papowell@h4+235.2 ->lp3
Printer: lp2@h4 (printing disabled)
Queue: no printable jobs in queue
Printer: lp3@h4 (printing disabled)
Queue: no printable jobs in queue</pre>
</div>
<p>The status reported for the spooled job indicates that the
job is routed to <tt class="LITERAL">lp2</tt>, and that two
copies will be sent. The <tt class="LITERAL">:destinations</tt>
option in the printcap entry causes <b class=
"APPLICATION">lpq</b> to display the contents of the specified
queues. Now execute the following commands:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN3733" id="AEN3733"></a>
<pre class="SCREEN"><samp class=
"PROMPT">h4: {286} % </samp><kbd class=
"USERINPUT">lpc start</kbd>
Printer: lp@h4
lp@h4.private: started
<samp class="PROMPT">h4: {287} % </samp><kbd class=
"USERINPUT">lpq</kbd>
Printer: lp@h4 (dest lp@localhost) (destinations lp2, lp3)
Queue: no printable jobs in queue
Status: job 'papowell@h4+235' removed at 16:14:37.491
Printer: lp2@h4 (printing disabled)
Queue: 2 printable jobs
Server: no server active
Rank Owner/ID Class Job Files Size Time
1 papowell@h4+235.1C1 A 235 /tmp/hi 3 16:14:36
2 papowell@h4+235.1C2 A 236 /tmp/hi 3 16:14:37
Printer: lp3@h4 (printing disabled)
Queue: 1 printable job
Server: no server active
Rank Owner/ID Class Job Files Size Time
1 papowell@h4+235.2 A 237 /tmp/hi 3 16:14:37
<samp class="PROMPT">h4: {288} % </samp><kbd class=
"USERINPUT">more /var/spool/lpd/lp2/cfA235*</kbd>
Hh4.private
Ppapowell
J/tmp/hi
Cred
Lpapowell
Apapowell@h4+235.1C1
D2000-06-01-16:03:25.237
Qlp
N/tmp/hi
fdfA235h4.private
UdfA235h4.private</pre>
</div>
<p>As you can see, two copies of the job has been transferred
to <tt class="LITERAL">lp2</tt> and one to <tt class=
"LITERAL">lp3</tt>, each with a different job number, If we
examine the control file for the jobs in the <tt class=
"LITERAL">lp2</tt> spool queue, we will find that the
<tt class="LITERAL">C</tt> or class information has been
changed to <tt class="LITERAL">red</tt>.</p>
<p>For details about all of the capabilities of the routing
filter, see <a href="destinations.htm">Dynamic Routing</a>.
Here is a summary of the information that the routing filter
can put into the routing file.</p>
<div class="VARIABLELIST">
<dl>
<dt>dest queue</dt>
<dd>
<p>Route this job to <tt class="LITERAL">queue</tt>. The
<tt class="LITERAL">queue@host</tt> form will transfer
the job to the queue on the named host.</p>
</dd>
<dt>copies N</dt>
<dd>
<p>Send N copies of this job to the destination.</p>
</dd>
<dt>priority C</dt>
<dd>
<p>Set the job priority letter to <tt class=
"LITERAL">C</tt>, where C is a single upper case
letter.</p>
</dd>
<dt>Cvalue</dt>
<dd>
<p>Set the control file line starting with <tt class=
"LITERAL">C</tt> to <tt class="LITERAL">Cvalue</tt>.</p>
</dd>
</dl>
</div>
<p>The exit status of the routing filter controls how the job
will be processed. If the exit code is JSUCC (0), then the job
will be processed normally, JHOLD will hold the job until
released, JREMOVE will remove the job, and so forth.</p>
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