08-02-2006
The person on call who shuts down the servers comes in early.
What is this poweroff command?
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Hai
Could somebody tell me the solution to my problem.
the question is as follows
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Hi All,
This is actually a good interview question.
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Hi,
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reboot(8) System Manager's Manual reboot(8)
NAME
reboot, halt, poweroff - reboot or stop the system
SYNOPSIS
reboot [OPTION]...
halt [OPTION]...
poweroff [OPTION]...
DESCRIPTION
These programs allow a system administrator to reboot, halt or poweroff the system.
When called with --force or when in runlevel 0 or 6, this tool invokes the reboot(2) system call itself and directly reboots the system.
Otherwise this simply invokes the shutdown(8) tool with the appropriate arguments.
Before invoking reboot(2), a shutdown time record is first written to /var/log/wtmp
OPTIONS
-f, --force
Does not invoke shutdown(8) and instead performs the actual action you would expect from the name.
-p, --poweroff
Instructs the halt command to instead behave as poweroff.
-w, --wtmp-only
Does not call shutdown(8) or the reboot(2) system call and instead only writes the shutdown record to /var/log/wtmp
--verbose
Outputs slightly more verbose messages when rebooting, useful for debugging problems with shutdown.
ENVIRONMENT
RUNLEVEL
reboot will read the current runlevel from this environment variable if set in preference to reading from /var/run/utmp
FILES
/var/run/utmp
Where the current runlevel will be read from; this file will also be updated with the runlevel record being replaced by a shutdown
time record.
/var/log/wtmp
A new runlevel record for the shutdown time will be appended to this file.
AUTHOR
Written by Scott James Remnant <scott@netsplit.com>
REPORTING BUGS
Report bugs at <https://launchpad.net/upstart/+bugs>
COPYRIGHT
Copyright (C) 2009 Canonical Ltd.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
shutdown(8) telinit(8) runlevel(8)
Upstart 2009-07-09 reboot(8)