Help with an Urgent Matter

Norman Gray norman.gray at
Wed Jul 11 19:26:58 UTC 2018


On 11 Jul 2018, at 20:08, David Johnson wrote:

> I have found a FreeBSD OS embedded in my Mac which is fully 
> implemented.

Not really.  macOS uses a lot of the FreeBSD 'userland' -- ie, the user 
commands -- but the kernel is significantly different.

There is quite a close relationship between macOS and FreeBSD, though 
I'm vague on the details (if anyone has any links, I'd be very 
interested in them).  However close it is, one cannot realistically say 
'macOS is FreeBSD'!

> I followed the instructions and did the following from your website
> documentation:
> in terminal;  shutdown -k +1 "message"

The -k option means:

     -k      Kick everybody off.  The -k option does not actually halt 
the sys-
              tem, but leaves the system multi-user with logins disabled 
(for all
              but super-user).

See 'man shutdown'

As it happens, I think that 'shutdown -h now' does work on macOS, but it 
may not be formally supported.  That is, there may well be other aspects 
of a fully controlled shutdown which this will miss.

Good wishes,


Norman Gray  :
SUPA School of Physics and Astronomy, University of Glasgow, UK

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