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Diffstat (limited to 'src/grp-system/systemctl/runlevel.xml')
| -rw-r--r-- | src/grp-system/systemctl/runlevel.xml | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/src/grp-system/systemctl/runlevel.xml b/src/grp-system/systemctl/runlevel.xml new file mode 100644 index 0000000000..ca29c7c22c --- /dev/null +++ b/src/grp-system/systemctl/runlevel.xml @@ -0,0 +1,192 @@ +<?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> |