02-16-2009
Understanding shutdown
Hi there,
I start using the function
shutdown instead of
reboot +
poweroff.
But there are some points that are not explained in the man pages.
1) What is the usage of the
t swith.
Quote:
shutdown 22:30 'Beware!'
shutdown -t 30 22:30 'Beware!'
Both commands will display the message immediatly on every terminal and shutdown at 22:30.
Where is the difference?
2) Can I specify the date/time like in the
date command?
Quote:
supernova:~# date
Mon Feb 16 22:33:45 CET 2009
supernova:~# date -d 'now + 1 minute'
Mon Feb 16 22:34:49 CET 2009
supernova:~# shutdown 'now + 1 minute'
Usage: shutdown [-akrhHPfnc] [-t secs] time [warning message]
[...]
supernova:~#
Thanks for your help
Santiago
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LEARN ABOUT CENTOS
poweroff
HALT(8) halt HALT(8)
NAME
halt, poweroff, reboot - Halt, power-off or reboot the machine
SYNOPSIS
halt [OPTIONS...]
poweroff [OPTIONS...]
reboot [OPTIONS...]
DESCRIPTION
halt, poweroff, reboot may be used to halt, power-off or reboot the machine.
OPTIONS
The following options are understood:
--help
Prints a short help text and exits.
--halt
Halt the machine, regardless of which one of the three commands is invoked.
-p, --poweroff
Power-off the machine, regardless of which one of the three commands is invoked.
--reboot
Reboot the machine, regardless of which one of the three commands is invoked.
-f, --force
Force immediate halt, power-off, reboot. Do not contact the init system.
-w, --wtmp-only
Only write wtmp shutdown entry, do not actually halt, power-off, reboot.
-d, --no-wtmp
Do not write wtmp shutdown entry.
--no-wall
Do not send wall message before halt, power-off, reboot.
EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise.
NOTES
These are legacy commands available for compatibility only.
SEE ALSO
systemd(1), systemctl(1), shutdown(8), wall(1)
systemd 208 HALT(8)