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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
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<refentry id='usermod.8'>
  <!--  $Id: usermod.8.xml,v 1.9 2005/06/16 16:01:21 kloczek Exp $  -->
  <refmeta>
    <refentrytitle>usermod</refentrytitle>
    <manvolnum>8</manvolnum>
  </refmeta>
  <refnamediv id='name'>
    <refname>usermod</refname>
    <refpurpose>Modify a user account</refpurpose>
  </refnamediv>

  <refsynopsisdiv id='synopsis'>
    <cmdsynopsis>
      <command>usermod</command>    
      <arg choice='opt'>-c <replaceable>comment</replaceable></arg>
      <arg choice='opt'>
        <arg choice='plain'>-d <replaceable>home_dir</replaceable></arg>
        <arg choice='opt'>-m </arg>
      </arg>
      <arg choice='opt'>-e <replaceable>expire_date</replaceable></arg>
      <arg choice='opt'>-f <replaceable>inactive_days</replaceable></arg>
      <arg choice='opt'>-g <replaceable>initial_group</replaceable></arg>
      <arg choice='opt'>
        <arg choice='plain'>-G <replaceable>group1</replaceable></arg>
        <arg choice='opt'>
          <arg choice='plain' rep='repeat'><replaceable>,group2,</replaceable></arg>
          <arg choice='plain'><replaceable>,</replaceable></arg>
          <arg choice='opt'><replaceable>groupN</replaceable></arg>
        </arg>
      </arg>
      <arg choice='opt'>-l <replaceable>login_name</replaceable></arg>
      <arg choice='opt'>-p <replaceable>passwd</replaceable></arg>
      <arg choice='opt'>-s <replaceable>shell</replaceable></arg>
      <arg choice='opt'>
        <arg choice='plain'>-u <replaceable>uid</replaceable></arg>
        <arg choice='opt'>-o </arg>
      </arg>
      <group choice='opt'>
        <arg choice='plain'>-L </arg>
	<arg choice='plain'>-U </arg>
      </group>
      <arg choice='plain'><replaceable>login</replaceable></arg>
    </cmdsynopsis>
  </refsynopsisdiv>
  
  <refsect1 id='description'>
    <title>DESCRIPTION</title>
    <para>
      The <command>usermod</command> command modifies the system account
      files to reflect the changes that are specified on the command line.
    </para>
  </refsect1>
  
  <refsect1 id='options'>
    <title>OPTIONS</title>
    <para>
      The options which apply to the <command>usermod</command> command
      are:
    </para>
    <variablelist remap='IP'>
      <varlistentry>
        <term>
          <option>-c</option> <replaceable>comment</replaceable>
        </term>
        <listitem>
          <para>The new value of the user's password file comment
            field. It is normally modified using the <citerefentry>
              <refentrytitle>chfn</refentrytitle><manvolnum>1</manvolnum>
            </citerefentry>utility.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>
          <option>-d</option> <replaceable>home_dir</replaceable>
        </term>
        <listitem>
          <para>
            The user's new login directory. If the <option>-m</option>
            option is given the contents of the current home directory will
            be moved to the new home directory, which is created if it does
            not already exist.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>
          <option>-e</option> <replaceable>expire_date</replaceable>
        </term>
        <listitem>
          <para>The date on which the user account will be disabled. The
            date is specified in the format <emphasis remap='I'>YYYY-MM-DD
            </emphasis>.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>
          <option>-f</option> <replaceable>inactive_days</replaceable>
        </term>
        <listitem>
          <para>The number of days after a password expires until the
            account is permanently disabled. A value of 0 disables the
            account as soon as the password has expired, and a value of -1
            disables the feature. The default value is -1.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>
          <option>-g</option> <replaceable>initial_group</replaceable>
        </term>
        <listitem>
          <para>The group name or number of the user's new initial login
            group. The group name must exist. A group number must refer to
            an already existing group. The default group number is 1.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>
          <option>-G</option> <replaceable>group1</replaceable>[<emphasis remap='I'>
            ,group2,...,
          </emphasis>
          [<emphasis remap='I'>groupN</emphasis>]]]
        </term>
        <listitem>
          <para>A list of supplementary groups which the user is also a
            member of. Each group is separated from the next by a comma,
            with no intervening whitespace. The groups are subject to the
            same restrictions as the group given with the
            <option>-g</option> option. If the user is currently a member of
            a group which is not listed, the user will be removed from the
            group.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>
          <option>-l</option> <replaceable>login_name</replaceable>
        </term>
        <listitem>
          <para>
            The name of the user will be changed from <emphasis
            remap='I'>login </emphasis> to <emphasis
            remap='I'>login_name</emphasis>. Nothing else is changed. In
            particular, the user's home directory name should probably be
            changed to reflect the new login name.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>
          <option>-L</option>
        </term>
        <listitem>
          <para>Lock a user's password. This puts a '!' in front of the
            encrypted password, effectively disabling the password. You
            can't use this option with <option>-p</option> or
            <option>-U</option>.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>
          <option>-o</option>
        </term>
        <listitem>
          <para>
            When used with the <option>-u</option> option, this option
            allows to change the user ID to a non-unique value.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>
          <option>-p</option> <replaceable>passwd</replaceable>
        </term>
        <listitem>
          <para>
            The encrypted password, as returned by <citerefentry>
              <refentrytitle>crypt</refentrytitle><manvolnum>3</manvolnum>
            </citerefentry>.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>
          <option>-s</option> <replaceable>shell</replaceable>
        </term>
        <listitem>
          <para>The name of the user's new login shell. Setting this field
            to blank causes the system to select the default login shell.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>
          <option>-u</option> <replaceable>uid</replaceable>
        </term>
        <listitem>
          <para>The numerical value of the user's ID. This value must be
            unique, unless the <option>-o</option> option is used. The value
            must be non-negative. Values between 0 and 99 are typically
            reserved for system accounts. Any files which the user owns and
            which are located in the directory tree rooted at the user's
            home directory will have the file user ID changed automatically.
            Files outside of the user's home directory must be altered
            manually.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>
          <option>-U</option>
        </term>
        <listitem>
          <para>Unlock a user's password. This removes the '!' in front of
            the encrypted password. You can't use this option with
            <option>-p</option> or <option>-L</option>.
          </para>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1 id='caveats'>
    <title>CAVEATS</title>
    <para><command>usermod</command> will not allow you to change the name of a
      user who is logged in. You must make certain that the named user is
      not executing any processes when this command is being executed if the
      user's numerical user ID is being changed. You must change the owner
      of any crontab files manually. You must change the owner of any at
      jobs manually. You must make any changes involving NIS on the NIS
      server.
    </para>
  </refsect1>
  
  <refsect1 id='files'>
    <title>FILES</title>
    <variablelist>
      <varlistentry>
        <term><filename>/etc/passwd</filename></term>
        <listitem>user account information</listitem>
      </varlistentry>
      <varlistentry>
        <term><filename>/etc/shadow</filename></term>
        <listitem>secure user account information</listitem>
      </varlistentry>
      <varlistentry>
        <term><filename>/etc/group</filename></term>
        <listitem>group account information</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>crypt</refentrytitle><manvolnum>3</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>useradd</refentrytitle><manvolnum>8</manvolnum>
      </citerefentry>,
      <citerefentry>
        <refentrytitle>userdel</refentrytitle><manvolnum>8</manvolnum>
      </citerefentry>.
    </para>
  </refsect1>
  
  <refsect1 id='author'>
    <title>AUTHOR</title>
    <para>Julianne Frances Haugh (jockgrrl@ix.netcom.com)</para>
  </refsect1>
</refentry>
