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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 | <!-- | |
6 | This file is part of systemd. | |
7 | ||
8 | Copyright 2010 Lennart Poettering | |
9 | ||
10 | systemd is free software; you can redistribute it and/or modify it | |
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11 | under the terms of the GNU Lesser General Public License as published by |
12 | the Free Software Foundation; either version 2.1 of the License, or | |
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13 | (at your option) any later version. |
14 | ||
15 | systemd is distributed in the hope that it will be useful, but | |
16 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 18 | Lesser General Public License for more details. |
359957ee | 19 | |
5430f7f2 | 20 | You should have received a copy of the GNU Lesser General Public License |
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21 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
22 | --> | |
23 | ||
dfdebb1b | 24 | <refentry id="runlevel" |
798d3a52 ZJS |
25 | xmlns:xi="http://www.w3.org/2001/XInclude" |
26 | conditional="HAVE_UTMP"> | |
27 | ||
28 | <refentryinfo> | |
29 | <title>runlevel</title> | |
30 | <productname>systemd</productname> | |
31 | ||
32 | <authorgroup> | |
33 | <author> | |
34 | <contrib>Developer</contrib> | |
35 | <firstname>Lennart</firstname> | |
36 | <surname>Poettering</surname> | |
37 | <email>lennart@poettering.net</email> | |
38 | </author> | |
39 | </authorgroup> | |
40 | </refentryinfo> | |
41 | ||
42 | <refmeta> | |
43 | <refentrytitle>runlevel</refentrytitle> | |
44 | <manvolnum>8</manvolnum> | |
45 | </refmeta> | |
46 | ||
47 | <refnamediv> | |
48 | <refname>runlevel</refname> | |
49 | <refpurpose>Print previous and current SysV runlevel</refpurpose> | |
50 | </refnamediv> | |
51 | ||
52 | <refsynopsisdiv> | |
53 | <cmdsynopsis> | |
54 | <command>runlevel <arg choice="opt" rep="repeat">options</arg></command> | |
55 | </cmdsynopsis> | |
56 | </refsynopsisdiv> | |
57 | ||
58 | <refsect1> | |
59 | <title>Description</title> | |
60 | ||
61 | <para><command>runlevel</command> prints the previous and current | |
62 | SysV runlevel if they are known.</para> | |
63 | ||
64 | <para>The two runlevel characters are separated by a single space | |
65 | character. If a runlevel cannot be determined, N is printed | |
66 | instead. If neither can be determined, the word "unknown" is | |
67 | printed.</para> | |
68 | ||
69 | <para>Unless overridden in the environment, this will check the | |
70 | utmp database for recent runlevel changes.</para> | |
71 | </refsect1> | |
72 | ||
73 | <refsect1> | |
74 | <title>Options</title> | |
75 | ||
76 | <para>The following option is understood:</para> | |
77 | ||
78 | <variablelist> | |
79 | <varlistentry> | |
80 | <term><option>--help</option></term> | |
81 | ||
82 | <xi:include href="standard-options.xml" xpointer="help-text" /> | |
83 | </varlistentry> | |
84 | </variablelist> | |
85 | ||
86 | </refsect1> | |
87 | ||
88 | <refsect1> | |
89 | <title>Exit status</title> | |
90 | ||
91 | <para>If one or both runlevels could be determined, 0 is returned, | |
92 | a non-zero failure code otherwise.</para> | |
93 | ||
94 | </refsect1> | |
95 | ||
96 | <refsect1> | |
97 | <title>Environment</title> | |
98 | ||
99 | <variablelist class='environment-variables'> | |
100 | <varlistentry> | |
101 | <term><varname>$RUNLEVEL</varname></term> | |
102 | ||
103 | <listitem><para>If <varname>$RUNLEVEL</varname> is set, | |
104 | <command>runlevel</command> will print this value as current | |
105 | runlevel and ignore utmp.</para></listitem> | |
106 | </varlistentry> | |
107 | ||
108 | <varlistentry> | |
109 | <term><varname>$PREVLEVEL</varname></term> | |
110 | ||
111 | <listitem><para>If <varname>$PREVLEVEL</varname> is set, | |
112 | <command>runlevel</command> will print this value as previous | |
113 | runlevel and ignore utmp.</para></listitem> | |
114 | </varlistentry> | |
115 | </variablelist> | |
116 | </refsect1> | |
117 | ||
118 | <refsect1> | |
119 | <title>Files</title> | |
120 | ||
121 | <variablelist> | |
122 | <varlistentry> | |
123 | <term><filename>/var/run/utmp</filename></term> | |
124 | ||
125 | <listitem><para>The utmp database <command>runlevel</command> | |
126 | reads the previous and current runlevel | |
127 | from.</para></listitem> | |
128 | </varlistentry> | |
129 | </variablelist> | |
130 | </refsect1> | |
131 | ||
132 | <refsect1> | |
133 | <title>Notes</title> | |
134 | ||
135 | <para>This is a legacy command available for compatibility only. | |
136 | It should not be used anymore, as the concept of runlevels is | |
137 | obsolete.</para> | |
138 | </refsect1> | |
139 | ||
140 | <refsect1> | |
141 | <title>See Also</title> | |
142 | <para> | |
143 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
144 | <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
145 | </para> | |
146 | </refsect1> | |
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147 | |
148 | </refentry> |