tcpdchk(8) on Linux
The text d506a593dccc, as Debian 3.0 (Woody), Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo), Debian 1.2 (Rex), Debian 1.1 (Buzz) shipped it.
tcp wrapper configuration checker
Flags it lists
-
-a -
-d -
-i -
-v