shadow/man/gpasswd.1.xml

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<?xml version="1.0" encoding="UTF-8"?>
<refentry id='gpasswd.1'>
<!-- $Id$ -->
<refmeta>
<refentrytitle>gpasswd</refentrytitle>
<manvolnum>1</manvolnum>
<refmiscinfo class="sectdesc">User Commands</refmiscinfo>
</refmeta>
<refnamediv id='name'>
<refname>gpasswd</refname>
<refpurpose>administer the <filename>/etc/group</filename> file</refpurpose>
</refnamediv>
<!-- body begins here -->
<refsynopsisdiv id='synopsis'>
<cmdsynopsis>
<command>gpasswd</command>
<arg choice='opt'>
<replaceable>option</replaceable>
</arg>
<arg choice='plain'>
<replaceable>group</replaceable>
</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id='description'>
<title>DESCRIPTION</title>
<para>
The <command>gpasswd</command> command is used to administer the
<filename>/etc/group</filename> file (and
<filename>/etc/gshadow</filename> file if compiled with SHADOWGRP
defined). Every group can have administrators, members and a password.
System administrator can use the <option>-A</option> option to define
group administrator(s) and the <option>-M</option> option to define
members and has all rights of group administrators and members.
</para>
<para>
<command>gpasswd</command> called by a group administrator with a group
name only prompts for the group password. If a password is set the
members can still <citerefentry>
<refentrytitle>newgrp</refentrytitle><manvolnum>1</manvolnum>
</citerefentry> without a password, and non-members must supply the
password.
</para>
<refsect2 id='notes_about_group_passwords'>
<title>Notes about group passwords</title>
<para>
Group passwords are an inherent security problem since more than one
person is permitted to know the password. However, groups are a
useful tool for permitting co-operation between different users.
</para>
</refsect2>
</refsect1>
<refsect1 id='options'>
<title>OPTIONS</title>
<para>
Except for the <option>-A</option> and <option>-M</option> options,
the options cannot be combined.
The options which apply to the <command>gpasswd</command> command are:
</para>
<variablelist remap='IP'>
<varlistentry>
<term>
<option>-a</option> <replaceable>user</replaceable>
</term>
<listitem>
<para>
Add the <replaceable>user</replaceable> to the named
<replaceable>group</replaceable>.
</para>
</listitem>
</varlistentry>
</variablelist>
<variablelist remap='IP'>
<varlistentry>
<term>
<option>-d</option> <replaceable>user</replaceable>
</term>
<listitem>
<para>
Remove the <replaceable>user</replaceable> from the named
<replaceable>group</replaceable>.
</para>
</listitem>
</varlistentry>
</variablelist>
<variablelist remap='IP'>
<varlistentry>
<term>
<option>-r</option>
</term>
<listitem>
<para>
Remove the password from the named <replaceable>group</replaceable>.
Only group members will be allowed to use
<command>newgrp</command> to join the named
<replaceable>group</replaceable>.
</para>
</listitem>
</varlistentry>
</variablelist>
<variablelist remap='IP'>
<varlistentry>
<term>
<option>-R</option>
</term>
<listitem>
<para>
Restrict the access to the named <replaceable>group</replaceable>.
Only group members will be allowed to use
<command>newgrp</command> to join the named
<replaceable>group</replaceable>.
</para>
</listitem>
</varlistentry>
</variablelist>
<variablelist remap='IP'>
<varlistentry>
<term>
<option>-A</option> <replaceable>user</replaceable>,...
</term>
<listitem>
<para>
Set the list of administrative users.
</para>
</listitem>
</varlistentry>
</variablelist>
<variablelist remap='IP'>
<varlistentry>
<term>
<option>-M</option> <replaceable>user</replaceable>,...
</term>
<listitem>
<para>
Set the list of group members.
</para>
</listitem>
</varlistentry>
</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>
<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>newgrp</refentrytitle><manvolnum>1</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>gshadow</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>groupadd</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>groupdel</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>groupmod</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>grpck</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>group</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>.
</para>
</refsect1>
</refentry>