sendfax(8) on Linux
The text 57c56e27e610, as Debian 2.0 (Hamm) shipped it.
send group 3 fax files (G3 files) with a class 2 faxmodem
Flags it lists
-
-C -
-S -
-d -
-m -
-n -
-p -
-r -
-v