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1 | <?xml version='1.0'?> <!--*-nxml-*--> |
2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" | |
12b42c76 | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
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4 | |
5 | <!-- | |
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6 | SPDX-License-Identifier: LGPL-2.1+ |
7 | ||
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8 | This file is part of systemd. |
9 | ||
10 | Copyright 2010 Lennart Poettering | |
11 | ||
12 | systemd is free software; you can redistribute it and/or modify it | |
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13 | under the terms of the GNU Lesser General Public License as published by |
14 | the Free Software Foundation; either version 2.1 of the License, or | |
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15 | (at your option) any later version. |
16 | ||
17 | systemd is distributed in the hope that it will be useful, but | |
18 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 20 | Lesser General Public License for more details. |
359957ee | 21 | |
5430f7f2 | 22 | You should have received a copy of the GNU Lesser General Public License |
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23 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
24 | --> | |
25 | ||
dfdebb1b | 26 | <refentry id="runlevel" |
798d3a52 | 27 | xmlns:xi="http://www.w3.org/2001/XInclude" |
3211da4b | 28 | conditional="ENABLE_UTMP"> |
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29 | |
30 | <refentryinfo> | |
31 | <title>runlevel</title> | |
32 | <productname>systemd</productname> | |
33 | ||
34 | <authorgroup> | |
35 | <author> | |
36 | <contrib>Developer</contrib> | |
37 | <firstname>Lennart</firstname> | |
38 | <surname>Poettering</surname> | |
39 | <email>lennart@poettering.net</email> | |
40 | </author> | |
41 | </authorgroup> | |
42 | </refentryinfo> | |
43 | ||
44 | <refmeta> | |
45 | <refentrytitle>runlevel</refentrytitle> | |
46 | <manvolnum>8</manvolnum> | |
47 | </refmeta> | |
48 | ||
49 | <refnamediv> | |
50 | <refname>runlevel</refname> | |
51 | <refpurpose>Print previous and current SysV runlevel</refpurpose> | |
52 | </refnamediv> | |
53 | ||
54 | <refsynopsisdiv> | |
55 | <cmdsynopsis> | |
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56 | <command>runlevel</command> |
57 | <arg choice="opt" rep="repeat">options</arg> | |
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58 | </cmdsynopsis> |
59 | </refsynopsisdiv> | |
60 | ||
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61 | <refsect1> |
62 | <title>Overview</title> | |
63 | ||
64 | <para>"Runlevels" are an obsolete way to start and stop groups of | |
65 | services used in SysV init. systemd provides a compatibility layer | |
66 | that maps runlevels to targets, and associated binaries like | |
67 | <command>runlevel</command>. Nevertheless, only one runlevel can | |
68 | be "active" at a given time, while systemd can activate multiple | |
69 | targets concurrently, so the mapping to runlevels is confusing | |
70 | and only approximate. Runlevels should not be used in new code, | |
71 | and are mostly useful as a shorthand way to refer the matching | |
72 | systemd targets in kernel boot parameters.</para> | |
73 | ||
74 | <table> | |
75 | <title>Mapping between runlevels and systemd targets</title> | |
76 | <tgroup cols='2' align='left' colsep='1' rowsep='1'> | |
77 | <colspec colname="runlevel" /> | |
78 | <colspec colname="target" /> | |
79 | <thead> | |
80 | <row> | |
81 | <entry>Runlevel</entry> | |
82 | <entry>Target</entry> | |
83 | </row> | |
84 | </thead> | |
85 | <tbody> | |
86 | <row> | |
87 | <entry>0</entry> | |
88 | <entry><filename>poweroff.target</filename></entry> | |
89 | </row> | |
90 | <row> | |
91 | <entry>1</entry> | |
92 | <entry><filename>rescue.target</filename></entry> | |
93 | </row> | |
94 | <row> | |
95 | <entry>2, 3, 4</entry> | |
96 | <entry><filename>multi-user.target</filename></entry> | |
97 | </row> | |
98 | <row> | |
99 | <entry>5</entry> | |
100 | <entry><filename>graphical.target</filename></entry> | |
101 | </row> | |
102 | <row> | |
103 | <entry>6</entry> | |
104 | <entry><filename>reboot.target</filename></entry> | |
105 | </row> | |
106 | </tbody> | |
107 | </tgroup> | |
108 | </table> | |
109 | </refsect1> | |
110 | ||
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111 | <refsect1> |
112 | <title>Description</title> | |
113 | ||
114 | <para><command>runlevel</command> prints the previous and current | |
115 | SysV runlevel if they are known.</para> | |
116 | ||
117 | <para>The two runlevel characters are separated by a single space | |
118 | character. If a runlevel cannot be determined, N is printed | |
119 | instead. If neither can be determined, the word "unknown" is | |
120 | printed.</para> | |
121 | ||
122 | <para>Unless overridden in the environment, this will check the | |
123 | utmp database for recent runlevel changes.</para> | |
124 | </refsect1> | |
125 | ||
126 | <refsect1> | |
127 | <title>Options</title> | |
128 | ||
129 | <para>The following option is understood:</para> | |
130 | ||
131 | <variablelist> | |
132 | <varlistentry> | |
133 | <term><option>--help</option></term> | |
134 | ||
135 | <xi:include href="standard-options.xml" xpointer="help-text" /> | |
136 | </varlistentry> | |
137 | </variablelist> | |
138 | ||
139 | </refsect1> | |
140 | ||
141 | <refsect1> | |
142 | <title>Exit status</title> | |
143 | ||
144 | <para>If one or both runlevels could be determined, 0 is returned, | |
145 | a non-zero failure code otherwise.</para> | |
146 | ||
147 | </refsect1> | |
148 | ||
149 | <refsect1> | |
150 | <title>Environment</title> | |
151 | ||
152 | <variablelist class='environment-variables'> | |
153 | <varlistentry> | |
154 | <term><varname>$RUNLEVEL</varname></term> | |
155 | ||
156 | <listitem><para>If <varname>$RUNLEVEL</varname> is set, | |
157 | <command>runlevel</command> will print this value as current | |
158 | runlevel and ignore utmp.</para></listitem> | |
159 | </varlistentry> | |
160 | ||
161 | <varlistentry> | |
162 | <term><varname>$PREVLEVEL</varname></term> | |
163 | ||
164 | <listitem><para>If <varname>$PREVLEVEL</varname> is set, | |
165 | <command>runlevel</command> will print this value as previous | |
166 | runlevel and ignore utmp.</para></listitem> | |
167 | </varlistentry> | |
168 | </variablelist> | |
169 | </refsect1> | |
170 | ||
171 | <refsect1> | |
172 | <title>Files</title> | |
173 | ||
174 | <variablelist> | |
175 | <varlistentry> | |
8c095a07 | 176 | <term><filename>/run/utmp</filename></term> |
798d3a52 | 177 | |
8c095a07 | 178 | <listitem><para>The utmp database <command>runlevel</command> reads the previous and current runlevel |
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179 | from.</para></listitem> |
180 | </varlistentry> | |
181 | </variablelist> | |
182 | </refsect1> | |
183 | ||
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184 | <refsect1> |
185 | <title>See Also</title> | |
186 | <para> | |
187 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
9f6434a6 | 188 | <citerefentry><refentrytitle>systemd.target</refentrytitle><manvolnum>5</manvolnum></citerefentry>, |
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189 | <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> |
190 | </para> | |
191 | </refsect1> | |
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192 | |
193 | </refentry> |