2c6782b501
exists but there are no shadow entries, an entry has to be created if the password is changed and passwd requires a shadow entry, or if aging features are used (-e or -f). Document this and also that -e and -f require a shadow file.
470 lines
15 KiB
XML
470 lines
15 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Copyright (c) 1991 - 1994, Julianne Frances Haugh
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Copyright (c) 2007 - 2009, Nicolas François
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the copyright holders or contributors may not be used to
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endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY MAIL_DIR SYSTEM "login.defs.d/MAIL_DIR.xml">
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<!ENTITY MAX_MEMBERS_PER_GROUP SYSTEM "login.defs.d/MAX_MEMBERS_PER_GROUP.xml">
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<!ENTITY TCB_SYMLINKS SYSTEM "login.defs.d/TCB_SYMLINKS.xml">
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<!ENTITY USE_TCB SYSTEM "login.defs.d/USE_TCB.xml">
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<!-- SHADOW-CONFIG-HERE -->
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]>
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<refentry id='usermod.8'>
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<!-- $Id$ -->
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<refmeta>
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<refentrytitle>usermod</refentrytitle>
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<manvolnum>8</manvolnum>
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<refmiscinfo class="sectdesc">System Management Commands</refmiscinfo>
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<refmiscinfo class="source">shadow-utils</refmiscinfo>
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<refmiscinfo class="version">&SHADOW_UTILS_VERSION;</refmiscinfo>
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</refmeta>
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<refnamediv id='name'>
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<refname>usermod</refname>
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<refpurpose>modify a user account</refpurpose>
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</refnamediv>
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<refsynopsisdiv id='synopsis'>
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<cmdsynopsis>
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<command>usermod</command>
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<arg choice='opt'>
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<replaceable>options</replaceable>
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</arg>
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<arg choice='plain'><replaceable>LOGIN</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1 id='description'>
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<title>DESCRIPTION</title>
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<para>
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The <command>usermod</command> command modifies the system account
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files to reflect the changes that are specified on the command line.
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</para>
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</refsect1>
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<refsect1 id='options'>
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<title>OPTIONS</title>
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<para>
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The options which apply to the <command>usermod</command> command
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are:
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</para>
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<variablelist>
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<varlistentry>
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<term>
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<option>-a</option>, <option>--append</option>
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</term>
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<listitem>
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<para>
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Add the user to the supplementary group(s). Use only with the
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<option>-G</option> option.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-c</option>, <option>--comment</option>
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<replaceable>COMMENT</replaceable>
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</term>
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<listitem>
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<para>
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The new value of the user's password file comment field. It is
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normally modified using the <citerefentry>
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<refentrytitle>chfn</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry> utility.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-d</option>, <option>--home</option>
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<replaceable>HOME_DIR</replaceable>
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</term>
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<listitem>
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<para>
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The user's new login directory.
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</para>
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<para>
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If the <option>-m</option>
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option is given, the contents of the current home directory will
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be moved to the new home directory, which is created if it does
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not already exist.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-e</option>, <option>--expiredate</option>
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<replaceable>EXPIRE_DATE</replaceable>
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</term>
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<listitem>
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<para>
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The date on which the user account will be disabled. The date is
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specified in the format <emphasis remap='I'>YYYY-MM-DD</emphasis>.
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</para>
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<para>
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This option requires a <filename>/etc/shadow</filename> file.
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A <filename>/etc/shadow</filename> entry will be created if
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there were none.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-f</option>, <option>--inactive</option>
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<replaceable>INACTIVE</replaceable>
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</term>
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<listitem>
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<para>
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The number of days after a password expires until the account is
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permanently disabled.
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</para>
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<para>
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A value of 0 disables the account as soon
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as the password has expired, and a value of -1 disables the
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feature.
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</para>
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<para>
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This option requires a <filename>/etc/shadow</filename> file.
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A <filename>/etc/shadow</filename> entry will be created if
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there were none.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-g</option>, <option>--gid</option>
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<replaceable>GROUP</replaceable>
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</term>
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<listitem>
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<para>
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The group name or number of the user's new initial login group.
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The group must exist.
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</para>
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<para>
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Any file from the user's home directory owned by the previous
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primary group of the user will be owned by this new group.
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</para>
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<para>
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The group ownership of files outside of the user's home directory
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must be fixed manually.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-G</option>, <option>--groups</option>
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<replaceable>GROUP1</replaceable>[<emphasis remap='I'>,GROUP2,...</emphasis>[<emphasis remap='I'>,GROUPN</emphasis>]]]
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</term>
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<listitem>
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<para>
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A list of supplementary groups which the user is also a member
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of. Each group is separated from the next by a comma, with no
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intervening whitespace. The groups are subject to the same
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restrictions as the group given with the <option>-g</option>
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option.
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</para>
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<para>
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If the user is currently a member of a group which is
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not listed, the user will be removed from the group. This
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behaviour can be changed via the <option>-a</option> option, which
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appends the user to the current supplementary group list.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-l</option>, <option>--login</option>
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<replaceable>NEW_LOGIN</replaceable>
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</term>
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<listitem>
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<para>
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The name of the user will be changed from
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<replaceable>LOGIN</replaceable> to
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<replaceable>NEW_LOGIN</replaceable>. Nothing else is changed. In
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particular, the user's home directory name should probably be
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changed manually to reflect the new login name.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-L</option>, <option>--lock</option>
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</term>
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<listitem>
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<para>
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Lock a user's password. This puts a '!' in front of the
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encrypted password, effectively disabling the password. You
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can't use this option with <option>-p</option> or
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<option>-U</option>.
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</para>
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<para>
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Note: if you wish to lock the account (not only access with a
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password), you should also set the
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<replaceable>EXPIRE_DATE</replaceable> to
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<replaceable>1</replaceable>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-m</option>, <option>--move-home</option>
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</term>
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<listitem>
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<para>
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Move the content of the user's home directory to the new
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location.
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</para>
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<para>
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This option is only valid in combination with the
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<option>-d</option> (or <option>--home</option>) option.
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</para>
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<para>
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<command>usermod</command> will try to adapt the ownership of the
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files and to copy the modes, ACL and extended attributes, but
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manual changes might be needed afterwards.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-o</option>, <option>--non-unique</option>
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</term>
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<listitem>
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<para>
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When used with the <option>-u</option> option, this option
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allows to change the user ID to a non-unique value.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-p</option>, <option>--password</option>
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<replaceable>PASSWORD</replaceable>
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</term>
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<listitem>
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<para>
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The encrypted password, as returned by <citerefentry>
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<refentrytitle>crypt</refentrytitle><manvolnum>3</manvolnum>
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</citerefentry>.
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</para>
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<para>
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<emphasis role="bold">Note:</emphasis> This option is not
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recommended because the password (or encrypted password) will
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be visible by users listing the processes.
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</para>
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<para condition="pam">
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The password will be written in the local
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<filename>/etc/passwd</filename> or
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<filename>/etc/shadow</filename> file. This might differ from the
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password database configured in your PAM configuration.
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</para>
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<para>
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You should make sure the password respects the system's
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password policy.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-s</option>, <option>--shell</option>
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<replaceable>SHELL</replaceable>
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</term>
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<listitem>
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<para>
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The name of the user's new login shell. Setting this field to
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blank causes the system to select the default login shell.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-u</option>, <option>--uid</option>
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<replaceable>UID</replaceable>
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</term>
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<listitem>
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<para>
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The new numerical value of the user's ID.
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</para>
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<para>
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This value must be unique,
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unless the <option>-o</option> option is used. The value must be
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non-negative. Values between 0 and 999 are typically reserved
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for system accounts.
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</para>
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<para>
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The user's mailbox, and any files which the user owns and which are
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located in the user's home
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directory will have the file user ID changed automatically.
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</para>
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<para>
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The ownership of files outside of the user's home directory
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must be fixed manually.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-U</option>, <option>--unlock</option>
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</term>
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<listitem>
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<para>
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Unlock a user's password. This removes the '!' in front of the
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encrypted password. You can't use this option with
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<option>-p</option> or <option>-L</option>.
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</para>
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<para>
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Note: if you wish to unlock the account (not only access with a
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password), you should also set the
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<replaceable>EXPIRE_DATE</replaceable> (for example to
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<replaceable>99999</replaceable>, or to the
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<option>EXPIRE</option> value from
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<filename>/etc/default/useradd</filename>).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-Z</option>, <option>--selinux-user</option>
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<replaceable>SEUSER</replaceable>
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</term>
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<listitem>
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<para>
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The SELinux user for the user's login. The default is to leave
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this field the blank, which causes the system to select the
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default SELinux user.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id='caveats'>
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<title>CAVEATS</title>
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<para>
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You must make certain that the named user is
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not executing any processes when this command is being executed if the
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user's numerical user ID, the user's name, or the user's home
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directory is being changed. <command>usermod</command> checks this
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on Linux, but only check if the user is logged in according to utmp
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on other architectures.
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</para>
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<para>
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You must change the owner of any <command>crontab</command> files or
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<command>at</command> jobs manually.
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</para>
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<para>
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You must make any changes involving NIS on the NIS server.
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</para>
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</refsect1>
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<refsect1 id='configuration'>
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<title>CONFIGURATION</title>
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<para>
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The following configuration variables in
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<filename>/etc/login.defs</filename> change the behavior of this
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tool:
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</para>
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<variablelist>
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&MAIL_DIR; <!-- documents also MAIL_FILE -->
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&MAX_MEMBERS_PER_GROUP;
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&TCB_SYMLINKS;
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&USE_TCB;
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</variablelist>
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</refsect1>
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<refsect1 id='files'>
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<title>FILES</title>
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<variablelist>
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<varlistentry>
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<term><filename>/etc/group</filename></term>
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<listitem>
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<para>Group account information.</para>
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</listitem>
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</varlistentry>
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<varlistentry condition="gshadow">
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<term><filename>/etc/gshadow</filename></term>
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<listitem>
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<para>Secure group account information.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/etc/passwd</filename></term>
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<listitem>
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<para>User account information.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/etc/shadow</filename></term>
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<listitem>
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<para>Secure user account information.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
|
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|
|
<refsect1 id='see_also'>
|
|
<title>SEE ALSO</title>
|
|
<para>
|
|
<citerefentry>
|
|
<refentrytitle>chfn</refentrytitle><manvolnum>1</manvolnum>
|
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</citerefentry>,
|
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<citerefentry>
|
|
<refentrytitle>chsh</refentrytitle><manvolnum>1</manvolnum>
|
|
</citerefentry>,
|
|
<citerefentry>
|
|
<refentrytitle>passwd</refentrytitle><manvolnum>1</manvolnum>
|
|
</citerefentry>,
|
|
<citerefentry>
|
|
<refentrytitle>crypt</refentrytitle><manvolnum>3</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>groupmod</refentrytitle><manvolnum>8</manvolnum>
|
|
</citerefentry>,
|
|
<citerefentry>
|
|
<refentrytitle>login.defs</refentrytitle><manvolnum>5</manvolnum>
|
|
</citerefentry>,
|
|
<citerefentry>
|
|
<refentrytitle>useradd</refentrytitle><manvolnum>8</manvolnum>
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|
</citerefentry>,
|
|
<citerefentry>
|
|
<refentrytitle>userdel</refentrytitle><manvolnum>8</manvolnum>
|
|
</citerefentry>.
|
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</para>
|
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</refsect1>
|
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</refentry>
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