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![Zbigniew Jędrzejewski-Szmek](/assets/img/avatar_default.png)
Put it at the top of the file, where it's hard to miss. Also add the mapping of runlevel → target because since it is now static. I'm not adding runlevel(7), because we do not want to make obsolete stuff even more prominent.
193 lines
5.7 KiB
XML
193 lines
5.7 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="runlevel"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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conditional="HAVE_UTMP">
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<refentryinfo>
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<title>runlevel</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>runlevel</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>runlevel</refname>
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<refpurpose>Print previous and current SysV runlevel</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>runlevel</command>
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<arg choice="opt" rep="repeat">options</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Overview</title>
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<para>"Runlevels" are an obsolete way to start and stop groups of
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services used in SysV init. systemd provides a compatibility layer
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that maps runlevels to targets, and associated binaries like
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<command>runlevel</command>. Nevertheless, only one runlevel can
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be "active" at a given time, while systemd can activate multiple
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targets concurrently, so the mapping to runlevels is confusing
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and only approximate. Runlevels should not be used in new code,
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and are mostly useful as a shorthand way to refer the matching
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systemd targets in kernel boot parameters.</para>
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<table>
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<title>Mapping between runlevels and systemd targets</title>
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<tgroup cols='2' align='left' colsep='1' rowsep='1'>
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<colspec colname="runlevel" />
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<colspec colname="target" />
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<thead>
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<row>
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<entry>Runlevel</entry>
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<entry>Target</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>0</entry>
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<entry><filename>poweroff.target</filename></entry>
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</row>
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<row>
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<entry>1</entry>
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<entry><filename>rescue.target</filename></entry>
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</row>
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<row>
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<entry>2, 3, 4</entry>
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<entry><filename>multi-user.target</filename></entry>
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</row>
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<row>
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<entry>5</entry>
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<entry><filename>graphical.target</filename></entry>
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</row>
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<row>
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<entry>6</entry>
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<entry><filename>reboot.target</filename></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</refsect1>
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<refsect1>
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<title>Description</title>
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<para><command>runlevel</command> prints the previous and current
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SysV runlevel if they are known.</para>
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<para>The two runlevel characters are separated by a single space
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character. If a runlevel cannot be determined, N is printed
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instead. If neither can be determined, the word "unknown" is
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printed.</para>
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<para>Unless overridden in the environment, this will check the
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utmp database for recent runlevel changes.</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 option is 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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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>If one or both runlevels could be determined, 0 is returned,
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a non-zero failure code otherwise.</para>
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</refsect1>
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<refsect1>
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<title>Environment</title>
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<variablelist class='environment-variables'>
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<varlistentry>
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<term><varname>$RUNLEVEL</varname></term>
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<listitem><para>If <varname>$RUNLEVEL</varname> is set,
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<command>runlevel</command> will print this value as current
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runlevel and ignore utmp.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$PREVLEVEL</varname></term>
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<listitem><para>If <varname>$PREVLEVEL</varname> is set,
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<command>runlevel</command> will print this value as previous
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runlevel and ignore utmp.</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>Files</title>
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<variablelist>
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<varlistentry>
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<term><filename>/var/run/utmp</filename></term>
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<listitem><para>The utmp database <command>runlevel</command>
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reads the previous and current runlevel
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from.</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>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>systemd.target</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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