mirror of
https://github.com/systemd/systemd
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![Zbigniew Jędrzejewski-Szmek](/assets/img/avatar_default.png)
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
181 lines
5.1 KiB
XML
181 lines
5.1 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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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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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="ENABLE_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>/run/utmp</filename></term>
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<listitem><para>The utmp database <command>runlevel</command> 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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