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Before Debian switched to systemd, `shutdown now` would reset the system into single user mode, doing roughly the equivalent of `telinit 1`. Now, systemd's `shutdown` command does not behave that way; it defaults to `poweroff` which might be confusing for users (like me) used to the previous method. Because I don't use the command often, I keep being stumped by this behavior, and every time I look at the `shutdown(1)` manpage, I don't understand why I can't find what I am looking for. This patch should make sure that people like me find their way back to some sort of reason. Maybe the *proper* way to fix this would be to restore the more classic behavior, but I'm definitely not going to climb that hill. Besides, I clearly remember the time I found out about the `shutdown` command and was *really* confused when it brought me back to a command-line prompt. That was really counter-intuitive and I find that change to actually be a good thing. So I'm not proposing to change this behavior, merely document it better. I originally added this to the `-P` option but it was suggested adding a new `COMPATIBILITY` section instead, where other such issues could be added. The `COMPATIBILITY` section is not actually officially documented. `man(1)` talks about a `CONFORMING TO` section, but `shutdown(1)` is not POSIX (`shutdown(2)` is, of course), so there's no actual standard on how this should work. The other option I considered was to add a `BUGS` section, but that seemed to inflammatory, and definitely counter-productive.
157 lines
5.1 KiB
XML
157 lines
5.1 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="shutdown"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>shutdown</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>shutdown</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>shutdown</refname>
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<refpurpose>Halt, power off or reboot the machine</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>shutdown</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="opt">TIME</arg>
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<arg choice="opt" rep="repeat">WALL</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>shutdown</command> may be used to halt, power off, or reboot the machine.</para>
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<para>The first argument may be a time string (which is usually
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<literal>now</literal>). Optionally, this may be followed by a
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wall message to be sent to all logged-in users before going
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down.</para>
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<para>The time string may either be in the format
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<literal>hh:mm</literal> for hour/minutes specifying the time to
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execute the shutdown at, specified in 24h clock format.
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Alternatively it may be in the syntax <literal>+m</literal>
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referring to the specified number of minutes m from now.
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<literal>now</literal> is an alias for <literal>+0</literal>, i.e.
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for triggering an immediate shutdown. If no time argument is
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specified, <literal>+1</literal> is implied.</para>
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<para>Note that to specify a wall message you must specify a time
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argument, too.</para>
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<para>If the time argument is used, 5 minutes before the system
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goes down the <filename>/run/nologin</filename> file is created to
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ensure that further logins shall not be allowed.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>--help</option></term>
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<xi:include href="standard-options.xml" xpointer="help-text" />
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</varlistentry>
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<varlistentry>
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<term><option>-H</option></term>
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<term><option>--halt</option></term>
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<listitem><para>Halt the machine.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-P</option></term>
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<term><option>--poweroff</option></term>
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<listitem><para>Power the machine off (the default).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-r</option></term>
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<term><option>--reboot</option></term>
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<listitem><para>Reboot the machine.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-h</option></term>
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<listitem><para>The same as <option>--poweroff</option>, but does not override the action to take if
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it is "halt". E.g. <command>shutdown --reboot -h</command> means "poweroff", but <command>shutdown
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--halt -h</command> means "halt".</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-k</option></term>
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<listitem><para>Do not halt, power off, or reboot, but just write the wall message.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--no-wall</option></term>
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<listitem><para>Do not send wall message before halt, power off, or reboot.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-c</option></term>
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<listitem><para>Cancel a pending shutdown. This may be used to cancel the effect of an invocation of
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<command>shutdown</command> with a time argument that is not <literal>+0</literal> or
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<literal>now</literal>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--show</option></term>
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<listitem><para>Show a pending shutdown action and time if
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there is any.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success, 0 is returned, a non-zero failure code
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otherwise.</para>
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</refsect1>
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<refsect1>
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<title>Compatibility</title>
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<para>The <command> shutdown</command> command in previous init systems (including sysvinit) defaulted to
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single-user mode instead of powering off the machine. To change into single-user mode, use
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<command>systemctl rescue</command> instead.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>halt</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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