How do I do a COLD Reboot on FreeBSD?

Malcolm Kay malcolm.kay at
Mon Jan 31 06:56:46 PST 2005

On Tue, 1 Feb 2005 01:01 am, Billy Newsom wrote:
> I need to do a cold restart.  I've looked through a lot of docs, and I
> can't seem to find this out.  The computer I am working with seems to no
> longer enjoy a warm reboot (like "shutdown -r now" or "reboot") but I'm
> pretty sure it will do cold reboots fine.  Is there a port, or is the
> shutdown command hackable for this, or what?

Try the man page for 'shutdown'.

# shutdown -h now
will cause a controlled shutdown finishing
with a message to "press any key to reboot".
At this stage you can switch off.

If your computer supports programmed power off 
then you can also use:
# shutdown -p now
which will end with powering down your machine.

> I remember many computers in bygone years which had this problem. It was
> pretty common back in the 90's it seems like.  Computers would reboot and
> act weird using CTRL-ALT-DELETE, but work fine when powered off and on.
Yes I've also experienced this. I always suspected it was one or other
peripheral device that is only reset on power down; but I really don't
have any justification for this assumption.


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