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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
<refentry id="shutdown"
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>shutdown</title>
<productname>systemd</productname>
</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 the machine off (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>The same as <option>--poweroff</option>, but does not override the action to take if
it is "halt". E.g. <command>shutdown --reboot -h</command> means "poweroff", but <command>shutdown
--halt -h</command> means "halt".</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-k</option></term>
<listitem><para>Do not halt, power off, or reboot, but just write the wall message.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--no-wall</option></term>
<listitem><para>Do not send wall message before halt, power off, or reboot.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-c</option></term>
<listitem><para>Cancel a pending shutdown. This may be used to 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>
<varlistentry>
<term><option>--show</option></term>
<listitem><para>Show a pending shutdown action and time if
there is any.</para>
<xi:include href="version-info.xml" xpointer="v250"/></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>Compatibility</title>
<para>The <command> shutdown</command> command in previous init systems (including sysvinit) defaulted to
single-user mode instead of powering off the machine. To change into single-user mode, use
<command>systemctl rescue</command> instead.</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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