Adding upstream version 241.upstream/241upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 167 insertions, 0 deletions

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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">
+
+<!--
+  SPDX-License-Identifier: LGPL-2.1+
+-->
+
+<refentry id="runlevel"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    conditional="ENABLE_UTMP">
+
+  <refentryinfo>
+    <title>runlevel</title>
+    <productname>systemd</productname>
+  </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>/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>