- Specify the configuration file to use. This overrides any
- configuration file specified by ${NOTMUCH\_CONFIG}.
+ Specify the configuration file to use. This overrides any
+ configuration file specified by ${NOTMUCH\_CONFIG}.
+
+ ``--uuid=HEX``
+ Enforce that the database UUID (a unique identifier which
+ persists until e.g. the database is compacted)
+ is HEX; exit with an error if it is not. This is useful to
+ detect rollover in modification counts on messages. You can
+ find this UUID using e.g. ``notmuch count --lastmod``