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+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+   SPDX-FileCopyrightText: 1991 - 1994, Julianne Frances Haugh
+   SPDX-FileCopyrightText: 2007 - 2008, Nicolas François
+   SPDX-License-Identifier: BSD-3-Clause
+-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.5//EN"
+  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
+<!-- SHADOW-CONFIG-HERE -->
+]>
+<refentry id='groups.1'>
+  <!-- $Id$ -->
+  <refentryinfo>
+    <author>
+      <firstname>Julianne Frances</firstname>
+      <surname>Haugh</surname>
+      <contrib>Creation, 1991</contrib>
+    </author>
+    <author>
+      <firstname>Thomas</firstname>
+      <surname>Kłoczko</surname>
+      <email>kloczek@pld.org.pl</email>
+      <contrib>shadow-utils maintainer, 2000 - 2007</contrib>
+    </author>
+    <author>
+      <firstname>Nicolas</firstname>
+      <surname>François</surname>
+      <email>nicolas.francois@centraliens.net</email>
+      <contrib>shadow-utils maintainer, 2007 - now</contrib>
+    </author>
+  </refentryinfo>
+  <refmeta>
+    <refentrytitle>groups</refentrytitle>
+    <manvolnum>1</manvolnum>
+    <refmiscinfo class="sectdesc">User Commands</refmiscinfo>
+    <refmiscinfo class="source">shadow-utils</refmiscinfo>
+    <refmiscinfo class="version">&SHADOW_UTILS_VERSION;</refmiscinfo>
+  </refmeta>
+  <refnamediv id='name'>
+    <refname>groups</refname>
+    <refpurpose>display current group names</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv id='synopsis'>
+    <cmdsynopsis>
+      <command>groups</command>
+      <arg choice='opt'>
+	<replaceable>user</replaceable>
+      </arg>
+    </cmdsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1 id='description'>
+    <title>DESCRIPTION</title>
+    <para>
+      The <command>groups</command> command displays the current group names
+      or ID values. If the value does not have a corresponding entry in
+      <filename>/etc/group</filename>, the value will be displayed as the
+      numerical group value. The optional <replaceable>user</replaceable>
+      parameter will display the groups for the named user.
+    </para>
+  </refsect1>
+
+  <refsect1 id='note'>
+    <title>NOTE</title>
+    <para>
+      Systems which do not support supplementary groups (see <citerefentry>
+	<refentrytitle>initgroups</refentrytitle><manvolnum>3</manvolnum>
+      </citerefentry>) will have the
+      information from <filename>/etc/group</filename> reported. The user
+      must use <command>newgrp</command> or <command>sg</command> to change
+      his current real and effective group ID.
+    </para>
+  </refsect1>
+
+  <refsect1 id='files'>
+    <title>FILES</title>
+    <variablelist>
+      <varlistentry>
+	<term><filename>/etc/group</filename></term>
+	<listitem>
+	  <para>Group account information.</para>
+	</listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <refsect1 id='see_also'>
+    <title>SEE ALSO</title>
+    <para>
+      <citerefentry>
+	<refentrytitle>newgrp</refentrytitle><manvolnum>1</manvolnum>
+      </citerefentry>,
+      <citerefentry>
+	<refentrytitle>getgid</refentrytitle><manvolnum>2</manvolnum>
+      </citerefentry>,
+      <citerefentry>
+	<refentrytitle>getgroups</refentrytitle><manvolnum>2</manvolnum>
+      </citerefentry>,
+      <citerefentry>
+	<refentrytitle>getuid</refentrytitle><manvolnum>2</manvolnum>
+      </citerefentry>,
+      <citerefentry>
+	<refentrytitle>initgroups</refentrytitle><manvolnum>3</manvolnum>
+      </citerefentry>.
+    </para>
+  </refsect1>
+</refentry>