sntp(1) on Linux
The text f2621ce7d493, as Debian 10 (Buster) shipped it.
standard Simple Network Time Protocol client program
Flags it lists
-
-! -
--authentication -
--broadcast -
--concurrent -
--debug-level -
--gap -
--help -
--ipv4 -
--ipv6 -
--keyfile -
--kod -
--load-opts -
--logfile -
--more-help -
--no-load-opts -
--ntpversion -
--save-opts -
--set-debug-level -
--slew -
--step -
--steplimit -
--timeout -
--usereservedport -
--version -
-4 -
-6 -
-< -
-> -
-? -
-D -
-K -
-M -
-S -
-a -
-b -
-c -
-d -
-g -
-k -
-l -
-o -
-r -
-s -
-t