axlisten(1) on Linux
The text 758c72dd69b6, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
monitor AX.25 traffic
Flags it lists
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-8 -
-a -
-c -
-h -
-i -
-p -
-r -
-t -
-v