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<th colspan="3" align="center">LPRng Reference Manual: 24
Sep 2004 (For LPRng-3.8.28)</th>
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<h1 class="SECT1"><a name="AEN5744" id="AEN5744">12.4. Using
:oh To Select Printcap Information</a></h1>
<p>When administering a large number of printers over a large
area, it is sometimes desirable to have a <span class=
"emphasis"><i class="EMPHASIS">default</i></span> printer for
each host. This default printer may be different for each host,
and can be selected by using the <tt class="LITERAL">oh</tt>
entry. The <tt class="LITERAL">oh</tt> value is a list of the
following entries</p>
<div class="INFORMALEXAMPLE">
<a name="AEN5750" id="AEN5750"></a>
<pre class="SCREEN">
[!] IP/n - address + mask length 10.0.0.0/8
[!] IP/IP - address + mask 10.0.0.0/255.0.0.0
[!] vvv - glob for hostname pc*.org.com</pre>
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<p>The <b class="APPLICATION">LPRng</b> software will determine
the hostnames and IP addresses assigned to the host and then
check to see if there is a match in the listed hostnames or IP
addresses. The optional test inversion (<tt class=
"LITERAL">!</tt>) causes the sense of the match to be inverted.
The list of addresses or entries are tested in sequence until a
match is found. If no match is found the printcap entry will
not be used. For example:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN5755" id="AEN5755"></a>
<pre class="SCREEN">
lp:oh=*.admin.org.com,10.0.0.5,10.2.0.0/16:lp=pr1@server1
lp:oh=*.eng.org.com:lp=hp@server2
color:oh=*.eng.org.com:lp=color@server3
color:oh=!*.eng.org.com:lp=color@server4</pre>
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<p>In the above example, if our host name is <tt class=
"FILENAME">booster.admin.org.com</tt>, then we would use
<tt class="LITERAL">lp=pr1@server1</tt>, as the <tt class=
"FILENAME">*.admin.org.com</tt> glob pattern would match our
host name.</p>
<p>if our host name is <tt class=
"FILENAME">booster.dev.org.com</tt> and our IP address is
10.2.0.1, then we would use <tt class=
"LITERAL">lp=pr1@server1</tt>, as the <tt class=
"FILENAME">10.2.0.0/16</tt> ip address would be in the
specified address range.</p>
<p>Finally we have an example of the use of the match inversion
operator (<tt class="LITERAL">!</tt>). All hosts whose name
matches <tt class="FILENAME">*.eng.org.com</tt> will use
<tt class="LITERAL">color@server3</tt> and the others will use
<tt class="LITERAL">color@server4</tt>.</p>
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