calendarserver_export(8) on Linux
The text 52657a44687d, as Debian 10 (Buster) shipped it. The page shows this text now.
Calendar Server export tool
Flags it lists
-
--collection -
--config -
--help -
--home -
--output -
--record -
--user -
-c -
-f -
-h -
-o -
-r -
-u