systemd/man/shutdown.xml

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        "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

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<refentry id="shutdown">

        <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 <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="opt">TIME</arg> <arg choice="opt" rep="repeat">WALL</arg></command>
                </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>/etc/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>

                                <listitem><para>Prints a short help
                                text and exits.</para></listitem>
                        </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>Don't halt, power-off,
                                reboot, just write wall
                                message.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--no-wall</option></term>

                                <listitem><para>Don't 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>Notes</title>

                <para>This is a legacy command available for
                compatibility only.</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><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                </para>
        </refsect1>

</refentry>