tcp_call(8) on Linux
The text b1180ac6e276, as Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge), Debian 3.0 (Woody), Debian 2.2 (Potato) shipped it.
make an AX.25, NET/ROM, ROSE or TCP connection
Flags it lists
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-c -
-i -
-o