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Old 01-15-2006, 10:52 PM   #1
edwin11
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Question What is the Difference Between Reboot and Shutdown?


Just a curious newbie question.

Why is it that when i shutdown, it switches to runlevel 0, but when i reboot, it switches to runlevel 6?

What is the difference between a reboot, and actually shutting down then turning the PC on again?



TIA and Regards,
Edwin
 
Old 01-15-2006, 11:08 PM   #2
NomadX
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From the man pages:

#: man reboot

DESCRIPTION
Halt notes that the system is being brought down in the file
/var/log/wtmp, and then either tells the kernel to halt, reboot or
poweroff the system.

If halt or reboot is called when the system is not in runlevel 0 or 6,
in other words when it’s running normally, shutdown will be invoked
instead (with the -h or -r flag). For more info see the shutdown(8)
manpage.

The rest of this manpage describes the behaviour in runlevels 0 and 6,
that is when the systems shutdown scripts are being run.


Basicaly, shutdown -h and -r are the 'safe' or 'normal' procedure, reboot is for when the system is for the most part already closed down.

At least that's how I understand it. Since shutdown chages init level before running, it's presumably gonna be more likely leave the entire system in a safe power off state. reboot lets you bypass this behavior if its done in one of the allowed init states.. (runlevels 0 and 6)

Cheers!

Last edited by NomadX; 01-15-2006 at 11:09 PM.
 
Old 01-16-2006, 08:57 AM   #3
sundialsvcs
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Eh?

Simply stated... "reboot" brings the computer to a complete stop, then boots it up again from scratch without actually turning off the power. "shutdown" does the same thing, then turns off the power.
 
Old 01-16-2006, 11:37 PM   #4
NomadX
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Eh?!?

Then why does reboot call shutdown -r when not already in init 0 or 6. Your right about the power states obviously, I just thought there was a hair more to it... No?
 
  


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