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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
SPDX-License-Identifier: LGPL-2.1+
This file is part of systemd.
Copyright 2010 Lennart Poettering
-->
<refentry id="shutdown"
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>shutdown</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>Lennart</firstname>
<surname>Poettering</surname>
<email>lennart@poettering.net</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>shutdown</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>shutdown</refname>
<refpurpose>Halt, power-off or reboot the machine</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>shutdown</command>
<arg choice="opt" rep="repeat">OPTIONS</arg>
<arg choice="opt">TIME</arg>
<arg choice="opt" rep="repeat">WALL</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><command>shutdown</command> may be used to halt, power-off
or reboot the machine.</para>
<para>The first argument may be a time string (which is usually
<literal>now</literal>). Optionally, this may be followed by a
wall message to be sent to all logged-in users before going
down.</para>
<para>The time string may either be in the format
<literal>hh:mm</literal> for hour/minutes specifying the time to
execute the shutdown at, specified in 24h clock format.
Alternatively it may be in the syntax <literal>+m</literal>
referring to the specified number of minutes m from now.
<literal>now</literal> is an alias for <literal>+0</literal>, i.e.
for triggering an immediate shutdown. If no time argument is
specified, <literal>+1</literal> is implied.</para>
<para>Note that to specify a wall message you must specify a time
argument, too.</para>
<para>If the time argument is used, 5 minutes before the system
goes down the <filename>/run/nologin</filename> file is created to
ensure that further logins shall not be allowed.</para>
</refsect1>
<refsect1>
<title>Options</title>
<para>The following options are understood:</para>
<variablelist>
<varlistentry>
<term><option>--help</option></term>
<xi:include href="standard-options.xml" xpointer="help-text" />
</varlistentry>
<varlistentry>
<term><option>-H</option></term>
<term><option>--halt</option></term>
<listitem><para>Halt the machine.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-P</option></term>
<term><option>--poweroff</option></term>
<listitem><para>Power-off the machine (the
default).</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-r</option></term>
<term><option>--reboot</option></term>
<listitem><para>Reboot the
machine.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-h</option></term>
<listitem><para>Equivalent to <option>--poweroff</option>,
unless <option>--halt</option> is specified.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-k</option></term>
<listitem><para>Do not halt, power-off, reboot, just write
wall message.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--no-wall</option></term>
<listitem><para>Do not send wall
message before
halt, power-off, reboot.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-c</option></term>
<listitem><para>Cancel a pending shutdown. This may be used
cancel the effect of an invocation of
<command>shutdown</command> with a time argument that is not
<literal>+0</literal> or
<literal>now</literal>.</para></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Exit status</title>
<para>On success, 0 is returned, a non-zero failure code
otherwise.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>halt</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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