mirror of
https://github.com/morgan9e/systemd
synced 2026-04-14 00:14:32 +09:00
0c69794138
These lines are generally out-of-date, incomplete and unnecessary. With SPDX and git repository much more accurate and fine grained information about licensing and authorship is available, hence let's drop the per-file copyright notice. Of course, removing copyright lines of others is problematic, hence this commit only removes my own lines and leaves all others untouched. It might be nicer if sooner or later those could go away too, making git the only and accurate source of authorship information.
177 lines
5.0 KiB
XML
177 lines
5.0 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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-->
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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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