snooze(1) on Linux
The text 9342d3ad51cc, as Debian 10 (Buster) shipped it.
run a command at a particular time
Flags it lists
-
-D -
-H -
-M -
-R -
-S -
-T -
-W -
-d -
-m -
-n -
-s -
-t -
-v -
-w