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<?xml version="1.0" encoding="UTF-8"?>
<!--
SPDX-FileCopyrightText: 2000 , International Business Machines
SPDX-FileCopyrightText: 2000 , George Kraft IV, gk4@us.ibm.com, 03/23/2000
SPDX-FileCopyrightText: 2005 , Tomasz Kłoczko
SPDX-FileCopyrightText: 2007 - 2011, 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" [
<!ENTITY MAX_MEMBERS_PER_GROUP SYSTEM "login.defs.d/MAX_MEMBERS_PER_GROUP.xml">
<!-- SHADOW-CONFIG-HERE -->
]>
<refentry id='groupmems.8'>
<!-- $Id$ -->
<refentryinfo>
<author>
<firstname>George</firstname>
<surname>Kraft</surname>
<lineage>IV</lineage>
<contrib>Creation, 2000</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>groupmems</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="sectdesc">System Management Commands</refmiscinfo>
<refmiscinfo class="source">shadow-utils</refmiscinfo>
<refmiscinfo class="version">&SHADOW_UTILS_VERSION;</refmiscinfo>
</refmeta>
<refnamediv id='name'>
<refname>groupmems</refname>
<refpurpose>administer members of a user's primary group</refpurpose>
</refnamediv>
<refsynopsisdiv id='synopsis'>
<cmdsynopsis>
<command>groupmems</command>
<group choice='plain'>
<arg choice='plain'>-a <replaceable>user_name</replaceable></arg>
<arg choice='plain'>-d <replaceable>user_name</replaceable></arg>
<arg choice='opt'>-g <replaceable>group_name</replaceable></arg>
<arg choice='plain'>-l </arg><arg choice='plain'>-p </arg>
</group>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id='description'>
<title>DESCRIPTION</title>
<para>
The <command>groupmems</command> command allows a user to administer
their own group membership list without the requirement of
superuser privileges. The <command>groupmems</command> utility is for
systems that configure its users to be in their own name sake primary
group (i.e., guest / guest).
</para>
<para>Only the superuser, as administrator, can use
<command>groupmems</command> to alter the memberships of other groups.
</para>
</refsect1>
<refsect1 id='options'>
<title>OPTIONS</title>
<para>
The options which apply to the <command>groupmems</command> command
are:
</para>
<variablelist remap='IP'>
<varlistentry>
<term><option>-a</option>, <option>--add</option> <replaceable>user_name</replaceable></term>
<listitem>
<para>Add a user to the group membership list.</para>
<para condition="gshadow">
If the <filename>/etc/gshadow</filename> file exist, and the
group has no entry in the <filename>/etc/gshadow</filename>
file, a new entry will be created.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-d</option>, <option>--delete</option> <replaceable>user_name</replaceable></term>
<listitem>
<para>Delete a user from the group membership list.</para>
<para condition="gshadow">
If the <filename>/etc/gshadow</filename> file exist, the user
will be removed from the list of members and administrators of
the group.
</para>
<para condition="gshadow">
If the <filename>/etc/gshadow</filename> file exist, and the
group has no entry in the <filename>/etc/gshadow</filename>
file, a new entry will be created.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-g</option>, <option>--group</option> <replaceable>group_name</replaceable></term>
<listitem>
<para>The superuser can specify which group membership
list to modify.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-h</option>, <option>--help</option></term>
<listitem>
<para>Display help message and exit.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-l</option>, <option>--list</option></term>
<listitem>
<para>List the group membership list.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-p</option>, <option>--purge</option></term>
<listitem>
<para>Purge all users from the group membership list.</para>
<para condition="gshadow">
If the <filename>/etc/gshadow</filename> file exist, and the
group has no entry in the <filename>/etc/gshadow</filename>
file, a new entry will be created.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-R</option>, <option>--root</option> <replaceable>CHROOT_DIR</replaceable>
</term>
<listitem>
<para>
Apply changes in the <replaceable>CHROOT_DIR</replaceable>
directory and use the configuration files from the
<replaceable>CHROOT_DIR</replaceable> directory.
Only absolute paths are supported.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id='setup'>
<title>SETUP</title>
<para>
The <command>groupmems</command> executable should be in mode
<literal>2710</literal> as user <emphasis>root</emphasis> and in group
<emphasis>groups</emphasis>. The system administrator can add users to
group <emphasis>groups</emphasis> to allow or disallow them using the
<command>groupmems</command> utility to manage their own group
membership list.
</para>
<programlisting>
$ groupadd -r groups
$ chmod 2710 groupmems
$ chown root:groups groupmems
$ groupmems -g groups -a gk4
</programlisting>
</refsect1>
<refsect1 id='configuration'>
<title>CONFIGURATION</title>
<para>
The following configuration variables in
<filename>/etc/login.defs</filename> change the behavior of this
tool:
</para>
<variablelist>
&MAX_MEMBERS_PER_GROUP;
</variablelist>
</refsect1>
<refsect1 id='files'>
<title>FILES</title>
<variablelist>
<varlistentry>
<term><filename>/etc/group</filename></term>
<listitem>
<para>Group account information.</para>
</listitem>
</varlistentry>
<varlistentry condition="gshadow">
<term><filename>/etc/gshadow</filename></term>
<listitem>
<para>secure group account information</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id='see_also'>
<title>SEE ALSO</title>
<para>
<citerefentry>
<refentrytitle>chfn</refentrytitle><manvolnum>1</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>chsh</refentrytitle><manvolnum>1</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>passwd</refentrytitle><manvolnum>1</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>groupadd</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>groupdel</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>useradd</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>userdel</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>usermod</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>.
</para>
</refsect1>
</refentry>
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