ntpd(8) on Linux
The text 71bff7ddc1b1, as Debian 9 (Stretch), Debian 7 (Wheezy) shipped it.
Network Time Protocol (NTP) daemon
Flags it lists
-
-4 -
-6 -
-A -
-L -
-N -
-P -
-U -
-V -
-a -
-b -
-c -
-f -
-g -
-i -
-k -
-l -
-n -
-p -
-q -
-r -
-s -
-t -
-u -
-v -
-x