``--config=FILE``
Specify the configuration file to use. This overrides any
- configuration file specified by ${NOTMUCH\_CONFIG}.
+ configuration file specified by ${NOTMUCH\_CONFIG}. The empty
+ string is a permitted and sometimes useful value of *FILE*, which
+ tells ``notmuch`` to use only configuration metadata from the database.
``--uuid=HEX``
Enforce that the database UUID (a unique identifier which persists
-------------
All options accepting an argument can be used with '=' or ':' as a
-separator. For the cases where it's not ambiguous (in particular
-excluding boolean options), a space can also be used. The following
-are all equivalent:
+separator. Except for boolean options (which would be ambiguous), a
+space can also be used as a separator. The following are all
+equivalent:
::