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<th colspan="3" align="center">LPRng-HOWTO: 1 Apr 2002
(For LPRng-3.8.10)</th>
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<td width="80%" align="center" valign="bottom">Chapter 2.
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<h1 class="SECT1"><a name="LPSIMULATION">2.11. Emulation for
UNIX SystemV <b class="APPLICATION">lp</b> and <b class=
"APPLICATION">lpstat</b></a></h1>
<p>Many utilities in the UNIX System V environment require
the <b class="APPLICATION">lp</b>, <b class=
"APPLICATION">lpstat</b>, and <b class=
"APPLICATION">cancel</b> programs. It is almost impossible to
modify these utilities, as many are <i class=
"EMPHASIS">vintage</i> software which is unsupported or which
would be too costly to update. In order to support these
applications <b class="APPLICATION">LPRng</b> emulates the <b
class="APPLICATION">lp</b>, <b class=
"APPLICATION">lpstat</b>, and <b class=
"APPLICATION">clean</b> programs. See the <b class=
"APPLICATION">LPRng</b> man pages for <b class=
"APPLICATION">lp</b>, <b class="APPLICATION">lpstat</b>, and
<b class="APPLICATION">cancel</b> in the <b class=
"APPLICATION">LPRng</b> distribution for details and
compatibility.</p>
<p>The <b class="APPLICATION">LPRng</b> <b class=
"APPLICATION">lpstat</b> emulator accepts the <b class=
"APPLICATION">lpstat</b> command line options returns status
in a format that is close to the one that common <b class=
"APPLICATION">lpstat</b> implementations return.
Unfortunately, due to the wide variety of different
modifications and vendor versions of <b class=
"APPLICATION">lpstat</b> there are slight differences between
the this status and the status returned by the original <b
class="APPLICATION">lpstat</b>. If this is the case, then
there is little to do but to modify the source code for <b
class="APPLICATION">lpstat</b> and compile a version that
implements the required format.</p>
<p>If the <b class="APPLICATION">lpr</b> program is invoked
with the name <b class="APPLICATION">lp</b>, it will simulate
the <b class="APPLICATION">lp</b> options. This can be done
by making a symbolic link to the <b class=
"APPLICATION">lpr</b> program or by making a copy of the <b
class="APPLICATION">lpr</b> program with the name <b class=
"APPLICATION">lp</b>.</p>
<div class="INFORMALEXAMPLE">
<a name="AEN1297"></a>
<pre class="SCREEN">
<tt class="PROMPT">h4: {59} #</tt> <tt class=
"USERINPUT"><b>cd /usr/bin</b></tt>
<tt class="PROMPT">h4: {60} #</tt> <tt class=
"USERINPUT"><b>ln -s lpr lp</b></tt>
<tt class="PROMPT">h4: {61} #</tt> <tt class=
"USERINPUT"><b>lp /tmp/hi</b></tt>
request id is root@h4+489
</pre>
</div>
<br>
<br>
<p>Finally, if the <b class="APPLICATION">lprm</b> program is
invoked with the name <b class="APPLICATION">cancel</b> it
will simulate the <b class="APPLICATION">cancel</b> command.
This can be done by making a symbolic link to the <b class=
"APPLICATION">lprm</b> program or by making a copy of the <b
class="APPLICATION">lprm</b> program with the name <b class=
"APPLICATION">cancel</b>.</p>
<div class="INFORMALEXAMPLE">
<a name="AEN1312"></a>
<pre class="SCREEN">
<tt class="PROMPT">h4: {62} #</tt> <tt class=
"USERINPUT"><b>cd /usr/bin</b></tt>
<tt class="PROMPT">h4: {63} #</tt> <tt class=
"USERINPUT"><b>ln -s lprm cancel</b></tt>
<tt class="PROMPT">h4: {64} #</tt> <tt class=
"USERINPUT"><b>cancel 489</b></tt>
cancel 513
Printer lp@h9:
checking perms 'root@h9+513'
dequeued 'root@h9+513'
</pre>
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<br>
<br>
<p>Many <i class="EMPHASIS">vintage</i> or <i class=
"EMPHASIS">legacy</i> applications have fully qualified paths
to the <b class="APPLICATION">lp</b> and <b class=
"APPLICATION">lpstat</b> executables, and it may be necessary
to make additional symbolic links or copies of the <b class=
"APPLICATION">LPRng</b> executables to satisfy their pathname
requirements.</p>
<div class="INFORMALEXAMPLE">
<a name="AEN1326"></a>
<pre class="SCREEN">
<tt class="PROMPT">h4: {65} #</tt> <tt class=
"USERINPUT"><b>ln -s /usr/bin/lpr /usr/ucb/lpr</b></tt>
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