cyrus-reconstruct(8) on Linux
The text 50d04b151ec6, as Debian 9 (Stretch) shipped it.
reconstruct mailboxes
Flags it lists
-
-G -
-O -
-R -
-U -
-f -
-m -
-n -
-o -
-q -
-r -
-s -
-u -
-x