chronyd(8) on Linux
The text c6fb215ca03d, as Debian 9 (Stretch) shipped it.
chrony daemon
Flags it lists
-
-4 -
-6 -
-F -
-P -
-Q -
-R -
-d -
-f -
-m -
-n -
-q -
-r -
-s -
-t -
-u -
-v