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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="halt"
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>halt</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>halt</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>halt</refname>
<refname>poweroff</refname>
<refname>reboot</refname>
<refpurpose>Halt, power-off or reboot the machine</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>halt</command>
<arg choice="opt" rep="repeat">OPTIONS</arg>
</cmdsynopsis>
<cmdsynopsis>
<command>poweroff</command>
<arg choice="opt" rep="repeat">OPTIONS</arg>
</cmdsynopsis>
<cmdsynopsis>
<command>reboot</command>
<arg choice="opt" rep="repeat">OPTIONS</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><command>halt</command>, <command>poweroff</command>, <command>reboot</command> may be used to
halt, power-off, or reboot the machine. All three commands take the same options.</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>--halt</option></term>
<listitem><para>Halt the machine, regardless of which one of
the three commands is invoked.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-p</option></term>
<term><option>--poweroff</option></term>
<listitem><para>Power-off the machine, when either <command>halt</command>
or <command>poweroff</command> is invoked. This option is ignored when
<command>reboot</command> is invoked.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--reboot</option></term>
<listitem><para>Reboot the machine, regardless of which one of
the three commands is invoked.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-f</option></term>
<term><option>--force</option></term>
<listitem>
<para>Force immediate halt, power-off, reboot. If specified, the command does not contact the init
system. In most cases, filesystems are not properly unmounted before shutdown. For example, the
command <command>reboot -f</command> is mostly equivalent to <command>systemctl reboot -ff</command>,
instead of <command>systemctl reboot -f</command>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-w</option></term>
<term><option>--wtmp-only</option></term>
<listitem><para>Only write wtmp shutdown entry, do not
actually halt, power-off, reboot.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-d</option></term>
<term><option>--no-wtmp</option></term>
<listitem><para>Do not write wtmp shutdown
entry.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-n</option></term>
<term><option>--no-sync</option></term>
<listitem><para>Don't sync hard disks/storage media before
halt, power-off, reboot.</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>
</variablelist>
</refsect1>
<refsect1>
<title>Exit status</title>
<para>On success, 0 is returned, a non-zero failure code
otherwise.</para>
</refsect1>
<refsect1>
<title>Notes</title>
<para>These commands are implemented in a way that preserves basic compatibility with the original SysV
commands. <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
verbs <command>halt</command>, <command>poweroff</command>, <command>reboot</command> provide the same
functionality with some additional features.</para>
<para>Note that on many SysV systems <command>halt</command> used to be synonymous to
<command>poweroff</command>, i.e. both commands would equally result in powering the machine off. systemd
is more accurate here, and <command>halt</command> results in halting the machine only (leaving power
on), and <command>poweroff</command> is required to actually power it off.</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>shutdown</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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