I am using ESXi 5.0 standalone and I just realized that they removed the visual update tool.
Now you have to buy vcenter I think if you want the update manager.
So I figured out how to do it with the CLI.
but what I was trying to figure out was a couple of things.
1) How do you list the updates installed. or a compare to show what's needed.
2) would be really cool to just call to a server, compare what is needed, and do a patch update with all the patches needed. Don't know if this is possible though.