remind(1) on Linux
The text 89b4abeaa0c5, as Debian 9 (Stretch) shipped it.
a sophisticated reminder service
Flags it lists
-
-a -
-b -
-dchars -
-e -
-f -
-h -
-i -
-j -
-k -
-l -
-m -
-n -
-o -
-q -
-r -
-t -
-tn -
-u -
-v -
-x -
-y