listen(1) on Linux
The text 14d410ae177a, as Debian 4.0 (Etch), Debian 3.1 (Sarge), Debian 3.0 (Woody), Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm) shipped it.
monitor AX.25 traffic
Flags it lists
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-8 -
-a -
-c -
-h -
-i -
-p -
-r -
-t -
-v