systemd/man/halt.xml

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<!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, regardless of which one
        of the three commands 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>