faxspool(1) on Linux
The text 344e418b6cbf, as Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo) shipped it.
queue and convert files for faxing with sendfax(8)
Flags it lists
-
-D -
-F -
-P -
-c -
-n -
-p -
-q -
-t