runlevel.xml revision 5430f7f2bc7330f3088b894166bf3524a067e3d8
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Copyright 2010 Lennart Poettering
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<refentry id="runlevel">
<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 <arg choice="opt" rep="repeat">options</arg></command>
</cmdsynopsis>
</refsynopsisdiv>
<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>
<listitem><para>Prints a short help
text and exits.</para></listitem>
</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>
<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>
<listitem><para>The utmp database
<command>runlevel</command> reads the
previous and current runlevel
from.</para></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Notes</title>
<para>This is a legacy command available for compatibility
only. It should not be used anymore, as the concept of
runlevels is obsolete.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>