Is there a list of all of the command bar commands somewhere?
I don't know but just try to write and it will offer you possible commands.
Go to help (? in a circle top right or F1), click on "Command Bar" those are the basics. There are/have been a couple of "undocumented" commands as well. The ones I know of are: update resources, update now, index. Some may be gone as we move out of beta.
Chris