rancid_par(1) on Linux
The text 6f26c0ffdb27, as Debian 10 (Buster), Debian 9 (Stretch) shipped it.
parallel command processing
Flags it lists
-
-F -
-H -
-c -
-d -
-e -
-f -
-i -
-l -
-n -
-p -
-q -
-x