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authorLuke Shumaker <lukeshu@lukeshu.com>2017-05-12 23:58:59 -0400
committerLuke Shumaker <lukeshu@lukeshu.com>2017-05-12 23:58:59 -0400
commitf838f51c238f8dcc4568eb68a16a7a86024eea5d (patch)
treef122167057382ce448e3101091225ba6647592da /src/grp-system/systemctl/runlevel.xml
parent39970d85d4c2313d43147f15047ac564603c7f8c (diff)
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+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="runlevel"
+ xmlns:xi="http://www.w3.org/2001/XInclude"
+ conditional="HAVE_UTMP">
+
+ <refentryinfo>
+ <title>runlevel</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>runlevel</refentrytitle>
+ <manvolnum>8</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>runlevel</refname>
+ <refpurpose>Print previous and current SysV runlevel</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <cmdsynopsis>
+ <command>runlevel</command>
+ <arg choice="opt" rep="repeat">options</arg>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Overview</title>
+
+ <para>"Runlevels" are an obsolete way to start and stop groups of
+ services used in SysV init. systemd provides a compatibility layer
+ that maps runlevels to targets, and associated binaries like
+ <command>runlevel</command>. Nevertheless, only one runlevel can
+ be "active" at a given time, while systemd can activate multiple
+ targets concurrently, so the mapping to runlevels is confusing
+ and only approximate. Runlevels should not be used in new code,
+ and are mostly useful as a shorthand way to refer the matching
+ systemd targets in kernel boot parameters.</para>
+
+ <table>
+ <title>Mapping between runlevels and systemd targets</title>
+ <tgroup cols='2' align='left' colsep='1' rowsep='1'>
+ <colspec colname="runlevel" />
+ <colspec colname="target" />
+ <thead>
+ <row>
+ <entry>Runlevel</entry>
+ <entry>Target</entry>
+ </row>
+ </thead>
+ <tbody>
+ <row>
+ <entry>0</entry>
+ <entry><filename>poweroff.target</filename></entry>
+ </row>
+ <row>
+ <entry>1</entry>
+ <entry><filename>rescue.target</filename></entry>
+ </row>
+ <row>
+ <entry>2, 3, 4</entry>
+ <entry><filename>multi-user.target</filename></entry>
+ </row>
+ <row>
+ <entry>5</entry>
+ <entry><filename>graphical.target</filename></entry>
+ </row>
+ <row>
+ <entry>6</entry>
+ <entry><filename>reboot.target</filename></entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+ </refsect1>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><command>runlevel</command> prints the previous and current
+ SysV runlevel if they are known.</para>
+
+ <para>The two runlevel characters are separated by a single space
+ character. If a runlevel cannot be determined, N is printed
+ instead. If neither can be determined, the word "unknown" is
+ printed.</para>
+
+ <para>Unless overridden in the environment, this will check the
+ utmp database for recent runlevel changes.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Options</title>
+
+ <para>The following option is understood:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term><option>--help</option></term>
+
+ <xi:include href="standard-options.xml" xpointer="help-text" />
+ </varlistentry>
+ </variablelist>
+
+ </refsect1>
+
+ <refsect1>
+ <title>Exit status</title>
+
+ <para>If one or both runlevels could be determined, 0 is returned,
+ a non-zero failure code otherwise.</para>
+
+ </refsect1>
+
+ <refsect1>
+ <title>Environment</title>
+
+ <variablelist class='environment-variables'>
+ <varlistentry>
+ <term><varname>$RUNLEVEL</varname></term>
+
+ <listitem><para>If <varname>$RUNLEVEL</varname> is set,
+ <command>runlevel</command> will print this value as current
+ runlevel and ignore utmp.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>$PREVLEVEL</varname></term>
+
+ <listitem><para>If <varname>$PREVLEVEL</varname> is set,
+ <command>runlevel</command> will print this value as previous
+ runlevel and ignore utmp.</para></listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>Files</title>
+
+ <variablelist>
+ <varlistentry>
+ <term><filename>/var/run/utmp</filename></term>
+
+ <listitem><para>The utmp database <command>runlevel</command>
+ reads the previous and current runlevel
+ from.</para></listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.target</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>