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groupmod.8.xml
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groupmod.8.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!--
SPDX-FileCopyrightText: 1991 , Julianne Frances Haugh
SPDX-FileCopyrightText: 2007 - 2011, Nicolas François
SPDX-License-Identifier: BSD-3-Clause
-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.5//EN"
"http:https://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>[email protected]</email>
<contrib>shadow-utils maintainer, 2000 - 2007</contrib>
</author>
<author>
<firstname>Nicolas</firstname>
<surname>François</surname>
<email>[email protected]</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>-a</option>, <option>--append</option> <replaceable>GID</replaceable>
</term>
<listitem>
<para>If group members are specified with -U, append them to the existing
member list, rather than replacing it.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-g</option>, <option>--gid</option> <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> <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> <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> <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>
<varlistentry>
<term>
<option>-P</option>, <option>--prefix</option> <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>
<varlistentry>
<term>
<option>-U</option>, <option>--users</option>
</term>
<listitem>
<para>
A list of usernames to add as members of the group.
</para>
<para>
The default behavior (if the <option>-g</option>,
<option>-N</option>, and <option>-U</option> options are not
specified) is defined by the <option>USERGROUPS_ENAB</option>
variable in <filename>/etc/login.defs</filename>.
</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: group id already in use</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>