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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
<refentry id='revnetgroup'>
<refmeta>
<refentrytitle>revnetgroup</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class='setdesc'>NIS Reference Manual</refmiscinfo>
</refmeta>
<refnamediv id='name'>
<refname>revnetgroup</refname>
<refpurpose>generate reverse netgroup data</refpurpose>
</refnamediv>
<!-- body begins here -->
<refsynopsisdiv id='synopsis'>
<cmdsynopsis>
<command>/usr/lib/yp/revnetgroup</command>
<group>
<arg choice='plain'>-u</arg>
<arg choice='plain'>-h</arg>
</group>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id='description'>
<title>DESCRIPTION</title>
<para>
<command>Revnetgroup</command>
processes the standard input in
<citerefentry><refentrytitle>netgroup</refentrytitle><manvolnum>5</manvolnum></citerefentry>
format into what is called
<emphasis remap='I'>reverse netgroup</emphasis>
form. That is, where the original file shows netgroup memberships in
terms of which members reside in a particular
group, the reverse netgroup format specifies what groups are associated
with a particular member. This information is used to generate the
<filename>netgroup.byuser</filename>
and <filename>netgroup.byhosts</filename>
NIS maps. These reverse netgroup maps are used to help speed up
netgroup lookups, particularly for the
<function>innetgr()</function> library function.
</para>
<para>
The <command>revnetgroup</command>
command prints its results on the standard output. It is usually called
only by <filename>/var/yp/Makefile</filename>
when rebuilding the NIS netgroup maps.
</para>
</refsect1>
<refsect1 id='options'>
<title>OPTIONS</title>
<variablelist remap='TP'>
<varlistentry>
<term><option>-u</option></term>
<listitem>
<para>
Generate <filename>netgroup.byuser</filename>
output; only username information in the
original netgroup file is processed.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-h</option></term>
<listitem>
<para>
Generate <filename>netgroup.byhost</filename>
output; only hostname information in the
original netgroup file is processed.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id='files'><title>FILES</title>
<variablelist>
<varlistentry>
<term><filename>/var/yp/Makefile</filename></term>
<listitem>
<para>The Makefile to build the NIS databases.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><filename>/etc/netgroup</filename></term>
<listitem>
<para>
The default netgroup database file. This file is most
often found only on the NIS master server.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id='see_also'>
<title>SEE ALSO</title>
<para>
<citerefentry><refentrytitle>getnetgrent</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>netgroup</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
</para>
</refsect1>
<refsect1 id='author'>
<title>AUTHOR</title>
<para>
<command>revnetgroup</command> was written by
Thorsten Kukuk <kukuk@linux-nis.org>.
</para>
</refsect1>
</refentry>
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