vboxmode(1) on Linux
The text d579553ee9ab, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it. The page shows this text now.
detect format of isdn voice file
Flags it lists
-
--help -
--quiet -
--version -
-h -
-q -
-v