+----------------------+------------------------------------------+
| *optstr* format | Command-line format |
+======================+==========================================+
- | ``x`` | :option:`-x` (short option) |
+ | ``x`` | :option:`!-x` (short option) |
+----------------------+------------------------------------------+
- | ``x:`` or ``x=`` | :option:`-x` (short option with value) |
+ | ``x:`` or ``x=`` | :option:`!-x` (short option with value) |
+----------------------+------------------------------------------+
| ``xyz`` | :option:`--xyz` (long option) |
+----------------------+------------------------------------------+