1 echo Error >/does/not/exist; echo One:$?
3 t=Ok >>/cant/be/created; echo One:$?
5 ! >/cant/be/created; echo Zero:$?
6 exec >/cant/be/created; echo One:$?
7 exec /bin/true >/cant/be/created; echo One:$?
8 ! exec /bin/true >/cant/be/created; echo Zero:$?