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Full Discussion: Reboot/Shutdown messages
Operating Systems Linux Reboot/Shutdown messages Post 302493778 by suryaemlinux on Thursday 3rd of February 2011 05:09:05 PM
Old 02-03-2011
Hi,
Thanks for your hint. I looked into my inittab file. And I found that if power fail happens we're calling "shutdown -n now". It's indeed emergency shutdown not going thro' any levels.

My question here is, why there's a message when the power fail happens which is "umount: /dev: Device or resource busy"? Which script executes "shutdown: unmounting all file systems" message or is this message from Kernel itself?
 

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LEARN ABOUT CENTOS

halt

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)
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