[Tricks] Single-user-mode with a twist

Had to restart a SQL Server in single-user mode. Two problems. One, the configuration was preventing it from starting properly, and there were automatic processes connecting to that single user.

The normal way to do it is:
sqlservr -m
(that's single user mode)
but for this we needed the configurations to not screw us up.
sqlservr -f
and we needed to make sure that it was only us connecting.
sqlservr -f"sqlcmd"
(Yes, you could also do sql server management studio)