mirror of
https://github.com/systemd/systemd
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163 lines
4.8 KiB
XML
163 lines
4.8 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="runlevel" conditional='HAVE_SYSV_COMPAT'
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>runlevel</title>
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<productname>systemd</productname>
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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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