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+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ Copyright (c) 1991 , Julianne Frances Haugh
+ Copyright (c) 2007 - 2011, Nicolas François
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ 1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+ 3. The name of the copyright holders or contributors may not be used to
+ endorse or promote products derived from this software without
+ specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+-->
+<!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='groupmod.8'>
+ <!-- $Id$ -->
+ <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>groupmod</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>groupmod</refname>
+ <refpurpose>modify a group definition on the system</refpurpose>
+ </refnamediv>
+ <!-- body begins here -->
+ <refsynopsisdiv id='synopsis'>
+ <cmdsynopsis>
+ <command>groupmod</command>
+ <arg choice='opt'>
+ <replaceable>options</replaceable>
+ </arg>
+ <arg choice='plain'><replaceable>GROUP</replaceable></arg>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1 id='description'>
+ <title>DESCRIPTION</title>
+ <para>
+ The <command>groupmod</command> command modifies the definition of the
+ specified <replaceable>GROUP</replaceable> by modifying the appropriate
+ entry in the group database.
+ </para>
+ </refsect1>
+
+ <refsect1 id='options'>
+ <title>OPTIONS</title>
+ <para>
+ The options which apply to the <command>groupmod</command> command
+ are:
+ </para>
+ <variablelist remap='IP'>
+ <varlistentry>
+ <term>
+ <option>-g</option>, <option>--gid</option>&nbsp;<replaceable>GID</replaceable>
+ </term>
+ <listitem>
+ <para>
+ The group ID of the given <replaceable>GROUP</replaceable> will
+ be changed to <replaceable>GID</replaceable>.
+ </para>
+ <para>
+ The value of
+ <replaceable>GID</replaceable> must be a non-negative decimal
+ integer. This value must be unique, unless the
+ <option>-o</option> option is used.
+ </para>
+ <para>
+ Users who use the group as primary group will be updated to
+ keep the group as their primary group.
+ </para>
+ <para>
+ Any files that have the
+ old group ID and must continue to belong to
+ <replaceable>GROUP</replaceable>, must have their group ID
+ changed manually.
+ </para>
+ <para>
+ No checks will be performed with regard to the
+ <option>GID_MIN</option>, <option>GID_MAX</option>,
+ <option>SYS_GID_MIN</option>, or <option>SYS_GID_MAX</option>
+ from <filename>/etc/login.defs</filename>.
+ </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>-n</option>, <option>--new-name</option>&nbsp;<replaceable>NEW_GROUP</replaceable>
+ </term>
+ <listitem>
+ <para>
+ The name of the group will be changed from <replaceable>GROUP</replaceable>
+ to <replaceable>NEW_GROUP</replaceable> name.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>-o</option>, <option>--non-unique</option>
+ </term>
+ <listitem>
+ <para>
+ When used with the <option>-g</option> option, allow to change the
+ group <replaceable>GID</replaceable> to a non-unique value.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>-p</option>, <option>--password</option>&nbsp;<replaceable>PASSWORD</replaceable>
+ </term>
+ <listitem>
+ <para>
+ The encrypted password, as returned by <citerefentry>
+ <refentrytitle>crypt</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>.
+ </para>
+ <para>
+ <emphasis role="bold">Note:</emphasis> This option is not
+ recommended because the password (or encrypted password) will
+ be visible by users listing the processes.
+ </para>
+ <para>
+ You should make sure the password respects the system's
+ password policy.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>-R</option>, <option>--root</option>&nbsp;<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.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>-P</option>, <option>--prefix</option>&nbsp;<replaceable>PREFIX_DIR</replaceable>
+ </term>
+ <listitem>
+ <para>
+ Apply changes in the <replaceable>PREFIX_DIR</replaceable>
+ directory and use the configuration files from the
+ <replaceable>PREFIX_DIR</replaceable> directory.
+ This option does not chroot and is intended for preparing
+ a cross-compilation target.
+ Some limitations: NIS and LDAP users/groups are not verified.
+ PAM authentication is using the host files.
+ No SELINUX support.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </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>
+ <varlistentry>
+ <term><filename>/etc/login.defs</filename></term>
+ <listitem>
+ <para>Shadow password suite configuration.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><filename>/etc/passwd</filename></term>
+ <listitem>
+ <para>User account information.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='exit_values'>
+ <title>EXIT VALUES</title>
+ <para>
+ The <command>groupmod</command> command exits with the following values:
+ <variablelist>
+ <varlistentry>
+ <term><replaceable>0</replaceable></term>
+ <listitem>
+ <para>E_SUCCESS: success</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><replaceable>2</replaceable></term>
+ <listitem>
+ <para>E_USAGE: invalid command syntax</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><replaceable>3</replaceable></term>
+ <listitem>
+ <para>E_BAD_ARG: invalid argument to option</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><replaceable>4</replaceable></term>
+ <listitem>
+ <para>E_GID_IN_USE: specified group doesn't exist</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><replaceable>6</replaceable></term>
+ <listitem>
+ <para>E_NOTFOUND: specified group doesn't exist</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><replaceable>9</replaceable></term>
+ <listitem>
+ <para>E_NAME_IN_USE: group name already in use</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><replaceable>10</replaceable></term>
+ <listitem>
+ <para>E_GRP_UPDATE: can't update group file</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><replaceable>11</replaceable></term>
+ <listitem>
+ <para>E_CLEANUP_SERVICE: can't setup cleanup service</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><replaceable>12</replaceable></term>
+ <listitem>
+ <para>E_PAM_USERNAME: can't determine your username for use with pam</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><replaceable>13</replaceable></term>
+ <listitem>
+ <para>E_PAM_ERROR: pam returned an error, see syslog facility id groupmod for the PAM error message</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </para>
+ </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>gpasswd</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>groupadd</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>groupdel</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>login.defs</refentrytitle><manvolnum>5</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>