Finish upgrading remote server without physically being there?

[Ed Flecko]

Hi folks,
If I understand the process of upgrading FreeeBSD correctly, after running:

make buildworld

make buildkernel

make installkernel

I then need to reboot into single user mode (which can only be done if
I'm physically standing at the machine, right?), and then finally:

adjkerntz -i

mount -a -t ufs

mergemaster -p

cd /usr/src

make installworld

mergemaster

and then one final reboot.

Is there a way to finish the upgrade process without actually being in
front of the server???

Thank you,
Ed