alsa_in(1) on Linux
The text 6d70d472222d, as Debian 8 (Jessie) shipped it.
Jack clients that perform I/O with an alternate audio interface
Flags it lists
-
-c -
-d -
-i -
-j -
-m -
-n -
-p -
-q -
-r -
-s -
-t -
-v