520 lines
15 KiB
XML
520 lines
15 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<refentry id='useradd.8'>
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<!-- $Id$ -->
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<refmeta>
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<refentrytitle>useradd</refentrytitle>
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<manvolnum>8</manvolnum>
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<refmiscinfo class="sectdesc">System Management Commands</refmiscinfo>
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</refmeta>
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<refnamediv id='name'>
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<refname>useradd</refname>
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<refpurpose>create a new user or update default new user information</refpurpose>
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</refnamediv>
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<refsynopsisdiv id='synopsis'>
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<cmdsynopsis>
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<command>useradd</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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<cmdsynopsis>
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<command>useradd</command>
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<arg choice='plain'>-D </arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>useradd</command>
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<arg choice='plain'>-D </arg>
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<arg choice='opt'>
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<replaceable>options</replaceable>
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</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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When invoked without the <option>-D</option> option, the
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<command>useradd</command> command creates a new user account using
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the values specified on the command line plus the default values from
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the system. Depending on command line options, the
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<command>useradd</command> command
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will update system files and may also create the new user's home
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directory and copy initial files.
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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>The options which apply to the <command>useradd</command> command are:
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</para>
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<variablelist remap='IP'>
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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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Any text string. It is generally a short description of the
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login, and is currently used as the field for the user's full
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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>-b</option>, <option>--base-dir</option>
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<replaceable>BASE_DIR</replaceable>
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</term>
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<listitem>
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<para>
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The default base directory for the system if <option>-d</option>
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<replaceable>HOME_DIR</replaceable> is not specified.
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<replaceable>BASE_DIR</replaceable> is
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concatenated with the account name to define the home directory.
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If the <option>-m</option> option is not used,
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<replaceable>BASE_DIR</replaceable> must 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>-D</option>
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</term>
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<listitem>
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<para>
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See below, the subsection "Changing the default values".
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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 new user will be created using
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<replaceable>HOME_DIR</replaceable> as the value for the user's
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login directory. The default is to append the
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<replaceable>LOGIN</replaceable> name to
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<replaceable>BASE_DIR</replaceable> and use that as the login
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directory name. The directory <replaceable>HOME_DIR</replaceable>
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does not have to exist but will not be created if it is missing.
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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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</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. 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. The default value is -1.
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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 initial login group. The
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group name must exist. A group number must refer to an already
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existing group. The default group number is 1 or whatever is
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specified in <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>-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. The default is for the user to belong only to the
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initial group.
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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><option>-h</option>, <option>--help</option></term>
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<listitem>
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<para>Display help message and exit.</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>--create-home</option>
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</term>
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<listitem>
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<para>
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The user's home directory will be created if it does not exist.
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The files contained in <replaceable>SKEL_DIR</replaceable> will
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be copied to the home directory if the <option>-k</option>
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option is used, otherwise the files contained in
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<filename>/etc/skel</filename> will be used instead. Any
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directories contained in <replaceable>SKEL_DIR</replaceable> or
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<filename>/etc/skel</filename> will be created in the user's
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home directory as well. The <option>-k</option> option is only
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valid in conjunction with the <option>-m</option> option. The
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default is to not create the directory and to not copy any
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files.
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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>-K</option>, <option>--key</option>
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<replaceable>KEY</replaceable>=<replaceable>VALUE</replaceable>
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</term>
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<listitem>
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<para>
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Overrides /etc/login.defs defaults (UID_MIN, UID_MAX, UMASK,
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PASS_MAX_DAYS and others).
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<para>
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</para>
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Example: <option>-K </option><replaceable>PASS_MAX_DAYS</replaceable>=<replaceable>-1</replaceable>
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can be used when creating system account to turn off password
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ageing, even though system account has no password at all.
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Multiple <option>-K</option> options can be specified, e.g.:
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<option>-K </option>
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<replaceable>UID_MIN</replaceable>=<replaceable>100</replaceable>
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<option> -K </option>
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<replaceable>UID_MAX</replaceable>=<replaceable>499</replaceable>
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</para>
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<para>
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Note: <option>-K </option>
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<replaceable>UID_MIN</replaceable>=<replaceable>10</replaceable>,<replaceable>UID_MAX</replaceable>=<replaceable>499</replaceable>
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doesn't work yet.
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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>Allow the creation of a user account with a duplicate (non-unique) UID.</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>. The default is to disable the account.
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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 login shell. The default is to leave this
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field blank, which causes the system to select the default login
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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 numerical value of the user's ID. 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. The default is to use the smallest ID value
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greater than 999 and greater than every other user. Values
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between 0 and 999 are typically reserved for system accounts.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<refsect2 id='changing_the_default_values'>
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<title>Changing the default values</title>
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<para>
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When invoked with only the <option>-D</option> option,
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<command>useradd</command> will display the current default values.
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When invoked with <option>-D</option> plus other options,
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<command>useradd</command> will update the default values for the
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specified options. Valid default-changing options are:
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</para>
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<variablelist remap='IP'>
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<varlistentry>
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<term>
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<option>-b</option>, <option>--base-dir</option>
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<replaceable>BASE_DIR</replaceable>
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</term>
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<listitem>
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<para>
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The path prefix for a new user's home directory. The
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user's name will be affixed to the end of
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<replaceable>BASE_DIR</replaceable> to form the new user's
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home directory name, if the <option>-d</option> option is not used
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when creating a new account.
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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>The date on which the user account is disabled.</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 has expired before the
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account will be disabled.
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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 ID for a new user's initial group. The named
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group must exist, and a numerical group ID must have an
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existing entry.
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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 a new user's login shell.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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</refsect1>
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<refsect1 id='notes'>
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<title>NOTES</title>
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<para>The system administrator is responsible for placing the default
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user files in the <filename>/etc/skel/</filename> directory.
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</para>
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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 may not add a user to a NIS group. This must be performed on the
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NIS server.
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</para>
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<para>
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Similarly, if the username already exists in an external user
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database such as NIS, <command>useradd</command> will deny
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the user account creation request.
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</para>
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<para>
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Usernames must begin with a lower case letter or an underscore, and
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only lower case letters, underscores, dashes, and dollar signs may
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follow. In regular expression terms: [a-z_][a-z0-9_-]*[$]
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</para>
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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/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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<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>
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<term><filename>/etc/default/useradd</filename></term>
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<listitem>
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<para>Default values for account creation.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/etc/skel/</filename></term>
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<listitem>
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<para>Directory containing default files.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/etc/login.defs</filename></term>
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<listitem>
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<para>Shadow password suite configuration.</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='exit_values'>
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<title>EXIT VALUES</title>
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<para>
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The <command>useradd</command> command exits with the following values:
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<variablelist>
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<varlistentry>
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<term><replaceable>0</replaceable></term>
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<listitem>
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<para>success</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>1</replaceable></term>
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<listitem>
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<para>can't update password file</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>2</replaceable></term>
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<listitem>
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<para>invalid command syntax</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>3</replaceable></term>
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<listitem>
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<para>invalid argument to option</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>4</replaceable></term>
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<listitem>
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<para>UID already in use (and no <option>-o</option>)</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>6</replaceable></term>
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<listitem>
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<para>specified group doesn't exist</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>9</replaceable></term>
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<listitem>
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<para>username already in use</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>10</replaceable></term>
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<listitem>
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<para>can't update group file</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>12</replaceable></term>
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<listitem>
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<para>can't create home directory</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>13</replaceable></term>
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<listitem>
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<para>can't create mail spool</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
|
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|
|
<refsect1 id='see_also'>
|
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<title>SEE ALSO</title>
|
|
<para>
|
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<citerefentry>
|
|
<refentrytitle>chfn</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>chsh</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>passwd</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry>,
|
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<citerefentry>
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<refentrytitle>crypt</refentrytitle><manvolnum>3</manvolnum>
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</citerefentry>,
|
|
<citerefentry>
|
|
<refentrytitle>groupadd</refentrytitle><manvolnum>8</manvolnum>
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|
</citerefentry>,
|
|
<citerefentry>
|
|
<refentrytitle>groupdel</refentrytitle><manvolnum>8</manvolnum>
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|
</citerefentry>,
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<citerefentry>
|
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<refentrytitle>groupmod</refentrytitle><manvolnum>8</manvolnum>
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|
</citerefentry>,
|
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<citerefentry>
|
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<refentrytitle>login.defs</refentrytitle><manvolnum>5</manvolnum>
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|
</citerefentry>,
|
|
<citerefentry>
|
|
<refentrytitle>newusers</refentrytitle><manvolnum>8</manvolnum>
|
|
</citerefentry>,
|
|
<citerefentry>
|
|
<refentrytitle>userdel</refentrytitle><manvolnum>8</manvolnum>
|
|
</citerefentry>,
|
|
<citerefentry>
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<refentrytitle>usermod</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>.
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</para>
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</refsect1>
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</refentry>
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