dangerous situation with shutdown process

[Dave Horsfall]

On Sat, 16 Jul 2005, Rick Kelly wrote:

> The main reason for sync;sync;sync on V7 UNIX was because you couldn't 
> do a shutdown, only a halt to the hardware monitor, on the PDP11. You
> can verify that behavior with SIMH. :-)

And you weren't supposed to use "sync;sync;sync" but this:

# sync
# sync
# sync

They were *not* the same.

-- Dave