clockprobe(8) on Linux
The text 3bbc0fb8a3dd, as Debian 2.1 (Slink), Debian 2.0 (Hamm) shipped it.
Flags it lists
-
-T -
-X -
-b -
-c -
-d -
-h -
-n -
-p -
-r -
-v -
-x