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<h1 class="SECT1"><a name="APPEND-Z">6.7. The -Z Passthrough
to Filter Options</a></h1>
<p>Options used:</p>
<ul>
<li>
<p><tt class="LITERAL">append_z=</tt><i class=
"EMPHASIS">Append values to Z options list</i></p>
</li>
<li>
<p><tt class="LITERAL">prefix_z=</tt><i class=
"EMPHASIS">Prefix values to Z options list</i></p>
</li>
<li>
<p><tt class="LITERAL">remove_z=</tt><i class=
"EMPHASIS">Remove values from Z options list</i></p>
</li>
<li>
<p><tt class="LITERAL">prefix_s_to_z</tt> FLAG <i class=
"EMPHASIS">Prefix control file S to Z information</i></p>
</li>
<li>
<p><tt class="LITERAL">prefix_s_to_z</tt> FLAG <i class=
"EMPHASIS">Prefix control file Z to S information</i></p>
</li>
</ul>
<br>
<br>
<p>By convention all of the values specified with the <tt
class="COMMAND">lpr -Z</tt> option are placed in the job
control file and passed to the <b class="APPLICATION">lpd</b>
server, which turn passes them to the print filters. This
allows users to pass options that are not part of the RFC1179
repetoire to filters.</p>
<p>In addition to this simple method of providing options, we
can have the <b class="APPLICATION">lpr</b> and <b class=
"APPLICATION">lpd</b> systems add options to the control file
information. The <tt class="LITERAL">prefix_z</tt> and <tt
class="LITERAL">append_z</tt> options allow us to put Z
options at the start or end of the user provided list; the
<tt class="LITERAL">remove_z</tt> removes specified options
from the list.</p>
<p>The <tt class="LITERAL">prefix_s_to_z</tt> and <tt class=
"LITERAL">prefix_z_to_s</tt> options are usually used by the
<b class="APPLICATION">lpd</b> server, and provides a simple
way to have the SystemV <tt class="COMMAND">lp -o option</tt>
values put into the <tt class="LITERAL">Z</tt> options value.
This is very useful when existing SysV <b class=
"APPLICATION">lp</b> print spooling systems need to be
interfaced to <b class="APPLICATION">LPRng</b> and the
options need to be handled in a meaningful manner. The <tt
class="LITERAL">prefix_z_to_s</tt> is similarly used when you
want to forward jobs to a SysV spooling system and have the
options passed correctly.</p>
<p>If present in the printer configuration, the various
requested actions are are done by the <b class=
"APPLICATION">lpr</b> client, the <b class=
"APPLICATION">lpd</b> server on job reception, and the <b
class="APPLICATION">lpd</b> server again on job processing.
This redundancy ensures that jobs which are sent to this
queue, arrive at this queue, or are processed by this queue
have the options set appropriately.</p>
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