While we're rearranging this content:

I think we should use `user name` instead of `user ID` and remove references to `ID` as a string identifier.  On UNIX systems, `uid` and `gid` are numbers, whereas the output of `whoami` is the name associated with the current `uid`.  Instead of pointing out these subtle differences to new users, I'd rather we just get our language as correct as possible.  

Thoughts from @r-gaia-cs and others?