man/runlevel.xml

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   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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   8   Copyright 2010 Lennart Poettering
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  23
  24 <refentry id="systemd">
  25
  26         <refentryinfo>
  27                 <title>runlevel</title>
  28                 <productname>systemd</productname>
  29
  30                 <authorgroup>
  31                         <author>
  32                                 <contrib>Developer</contrib>
  33                                 <firstname>Lennart</firstname>
  34                                 <surname>Poettering</surname>
  35                                 <email>lennart@poettering.net</email>
  36                         </author>
  37                 </authorgroup>
  38         </refentryinfo>
  39
  40         <refmeta>
  41                 <refentrytitle>runlevel</refentrytitle>
  42                 <manvolnum>8</manvolnum>
  43         </refmeta>
  44
  45         <refnamediv>
  46                 <refname>runlevel</refname>
  47                 <refpurpose>Print previous and current SysV runlevel</refpurpose>
  48         </refnamediv>
  49
  50         <refsynopsisdiv>
  51                 <cmdsynopsis>
  52                         <command>runlevel <arg choice="opt" rep="repeat">options</arg></command>
  53                 </cmdsynopsis>
  54         </refsynopsisdiv>
  55
  56         <refsect1>
  57                 <title>Description</title>
  58
  59                 <para><command>runlevel</command> prints the previous
  60                 and current SysV runlevel if they are known.</para>
  61
  62                 <para>The two runlevel characters are seperated by a
  63                 single space character. If a runlevel cannot be
  64                 determined N is printed instead. If neither can be
  65                 determined the word "unknown" is printed.</para>
  66
  67                 <para>Unless overriden in the environment this will
  68                 check the utmp database for recent runlevel
  69                 changes.</para>
  70
  71                 <para>The following option is understood:</para>
  72
  73                 <variablelist>
  74                         <varlistentry>
  75                                 <term>--help</term>
  76
  77                                 <listitem><para>Prints a short help
  78                                 text and exits.</para></listitem>
  79                         </varlistentry>
  80                 </variablelist>
  81
  82         </refsect1>
  83
  84         <refsect1>
  85                 <title>Exit status</title>
  86
  87                 <para>If one or both runlevels could be determined, 0
  88                 is returned, a non-zero failure code otherwise.</para>
  89
  90         </refsect1>
  91
  92         <refsect1>
  93                 <title>Environment</title>
  94
  95                 <variablelist>
  96                         <varlistentry>
  97                                 <term><varname>$RUNLEVEL</varname></term>
  98
  99                                 <listitem><para>If
 100                                 <varname>$RUNLEVEL</varname> is set,
 101                                 <command>runlevel</command> will print
 102                                 this value as current runlevel and
 103                                 ignore utmp.</para></listitem>
 104                         </varlistentry>
 105
 106                         <varlistentry>
 107                                 <term><varname>$PREVLEVEL</varname></term>
 108
 109                                 <listitem><para>If
 110                                 <varname>$PREVLEVEL</varname> is set
 111                                 <command>runlevel</command> will print
 112                                 this value as previous runlevel and
 113                                 ignore utmp.</para></listitem>
 114                         </varlistentry>
 115                 </variablelist>
 116         </refsect1>
 117
 118         <refsect1>
 119                 <title>Files</title>
 120
 121                 <variablelist>
 122                         <varlistentry>
 123                                 <term><varname>/var/run/utmp</varname></term>
 124
 125                                 <listitem><para>The utmp database
 126                                 <command>runlevel</command> reads the
 127                                 previous and current runlevel
 128                                 from.</para></listitem>
 129
 130                         </varlistentry>
 131                 </variablelist>
 132         </refsect1>
 133
 134         <refsect1>
 135                 <title>Notes</title>
 136
 137                 <para>This is a legacy command available for compatibility
 138                 only. It should not be used anymore, as the concept of
 139                 runlevels is obsolete.</para>
 140         </refsect1>
 141
 142         <refsect1>
 143                 <title>See Also</title>
 144                 <para>
 145                         <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
 146                 </para>
 147         </refsect1>
 148
 149 </refentry>