Major Section: HISTORY
Example: :ubu! :x-4
The keyword command :ubu! is the same as :ubu, but with
related queries suppressed appropriately, and with a guarantee that it is
``error-free.'' More precisely, the error triple (see error-triples)
returned by :ubu! will always be of the form (mv nil val state).
:Oops will undo the last :ubu!. Also see ubu, see ubt, and
see u.
