notify-send(1) on Linux
The text a2b6d3bb8c1b, as Debian 10 (Buster), Debian 9 (Stretch) shipped it.
a program to send desktop notifications
Flags it lists
-
--category -
--expire-time -
--help -
--hint -
--icon -
-? -
-c -
-h -
-i -
-t