6e8323e9fb
This information can be read by the "runlevel" command as well as "halt" and "reboot". Having the information logged in /var/run/runlevel as well as the utmp file means systems without utmp (like those running the musl C library) can still check the current runlevel. This is useful when running halt/reboot as these programs want to check the runlevel. Updated the changelog, and manual pages for halt and runlevel.
59 lines
1.9 KiB
Groff
59 lines
1.9 KiB
Groff
'\" -*- coding: UTF-8 -*-
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.\" Copyright (C) 1997 Miquel van Smoorenburg.
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.\"
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.\" This program is free software; you can redistribute it and/or modify
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.\" it under the terms of the GNU General Public License as published by
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.\" the Free Software Foundation; either version 2 of the License, or
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.\" (at your option) any later version.
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.\"
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.\" This program is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public License
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.\" along with this program; if not, write to the Free Software
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.\" Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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.\"
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.TH RUNLEVEL 8 "May 27, 1997" "" "Linux System Administrator's Manual"
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.SH NAME
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runlevel -- find the previous and current system runlevel.
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.SH SYNOPSIS
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.B runlevel
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.RI [ utmp ]
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.SH DESCRIPTION
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.B Runlevel
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reads the system
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.I utmp
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file (typically
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.IR /var/run/utmp )
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to locate the runlevel record, and then
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prints the previous and current system runlevel on its standard output,
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separated by a single space. If there is no previous system
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runlevel, the letter \fBN\fP will be printed instead.
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.PP
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If no
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.I utmp
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file exists, and if no runlevel record can be found in the
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.I /var/run/runlevel
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file,
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.B runlevel
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prints the word \fBunknown\fP and exits with an error.
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.PP
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.B Runlevel
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can be used in \fIrc\fP scripts as a substitute for the System-V
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\fBwho -r\fP command.
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However, in newer versions of \fBinit\fP(8) this information
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is also available in the environment variables \fBRUNLEVEL\fP and
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\fBPREVLEVEL\fP.
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.SH OPTIONS
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.\"{{{ utmp
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.IP \fIutmp\fP
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The name of the \fIutmp\fP file to read.
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.\"}}}
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.SH SEE ALSO
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.BR init (8),
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.BR utmp (5)
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.SH AUTHOR
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Miquel van Smoorenburg, miquels@cistron.nl
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