portupgrade: Download -> single user -> upgrade

[Kyrre Nygård]

Hey!

I was wondering if anybody could give me a quick cheat sheet for how 
to automatically:

1) Download all outdated ports
2) Switch to single user mode
3) Upgrade those ports

Running portupgrade -a doesn't work very well when it's time to 
upgrade running processes.

I assume this involves a bit more than just the portupgrade commands?

Thanks a lot.

All the best,
Kyrre