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<?xml version="1.0" encoding="UTF-8"?>
<!--
SPDX-FileCopyrightText: 1989 - 1992, Julianne Frances Haugh
SPDX-FileCopyrightText: 2007 - 2008, Nicolas François
SPDX-License-Identifier: BSD-3-Clause
-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
<!ENTITY ENV_HZ SYSTEM "login.defs.d/ENV_HZ.xml">
<!ENTITY ENV_TZ SYSTEM "login.defs.d/ENV_TZ.xml">
<!-- SHADOW-CONFIG-HERE -->
]>
<refentry id='sulogin.8'>
<!-- $Id$ -->
<refentryinfo>
<author>
<firstname>Julianne Frances</firstname>
<surname>Haugh</surname>
<contrib>Creation, 1989</contrib>
</author>
<author>
<firstname>Thomas</firstname>
<surname>Kłoczko</surname>
<email>kloczek@pld.org.pl</email>
<contrib>shadow-utils maintainer, 2000 - 2007</contrib>
</author>
<author>
<firstname>Nicolas</firstname>
<surname>François</surname>
<email>nicolas.francois@centraliens.net</email>
<contrib>shadow-utils maintainer, 2007 - now</contrib>
</author>
</refentryinfo>
<refmeta>
<refentrytitle>sulogin</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="sectdesc">System Management Commands</refmiscinfo>
<refmiscinfo class="source">shadow-utils</refmiscinfo>
<refmiscinfo class="version">&SHADOW_UTILS_VERSION;</refmiscinfo>
</refmeta>
<refnamediv id='name'>
<refname>sulogin</refname>
<refpurpose>Single-user login</refpurpose>
</refnamediv>
<refsect1 id='syntax'>
<title>SYNTAX</title>
<para><command>sulogin</command> [<emphasis remap='I'>tty-device</emphasis>]
</para>
</refsect1>
<refsect1 id='description'>
<title>DESCRIPTION</title>
<para>
The <command>sulogin</command> command is invoked by <command>init</command>
prior to allowing the user access to the system when in single user mode.
This feature may only be available on certain systems where
<command>init</command> has been modified accordingly, or where the
<filename>/etc/inittab</filename> has an entry for a single user
login.
</para>
<para>The user is prompted</para>
<para>Type control-d to proceed with normal startup,
<!-- .br -->
(or give root password for system maintenance):
</para>
<para>
Input and output will be performed with the standard file descriptors
unless the optional device name argument is provided.
</para>
<para>
If the user enters the correct root password, a login session is
initiated. When <emphasis>EOF</emphasis> is pressed instead, the
system enters multi-user mode.
</para>
<para>
After the user exits the single-user shell, or presses
<emphasis>EOF</emphasis>, the system begins the initialization process
required to enter multi-user mode.
</para>
</refsect1>
<refsect1 id='caveats'>
<title>CAVEATS</title>
<para>
This command can only be used if <command>init</command> has been
modified to call <command>sulogin</command> instead of
<filename>/bin/sh</filename>, or if the user has set the <emphasis
remap='I'>inittab</emphasis> to support a single user login. For
example, the line:
</para>
<para>co:s:respawn:/etc/sulogin /dev/console</para>
<para>should execute the sulogin command in single user mode.</para>
<para>
As complete an environment as possible is created. However, various
devices may be unmounted or uninitialized and many of the user
commands may be unavailable or nonfunctional as a result.
</para>
</refsect1>
<refsect1 id='configuration'>
<title>CONFIGURATION</title>
<para>
The following configuration variables in
<filename>/etc/login.defs</filename> change the behavior of this
tool:
</para>
<variablelist>
&ENV_HZ;
&ENV_TZ;
</variablelist>
</refsect1>
<refsect1 id='files'>
<title>FILES</title>
<variablelist>
<varlistentry>
<term><filename>/etc/passwd</filename></term>
<listitem>
<para>User account information.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><filename>/etc/shadow</filename></term>
<listitem>
<para>Secure user account information.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id='see_also'>
<title>SEE ALSO</title>
<para>
<citerefentry>
<refentrytitle>login</refentrytitle><manvolnum>1</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>init</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>.
</para>
</refsect1>
</refentry>
|
