The end

Now that I already cover the core port of OpenBSD's netcat implementation, it is time to wrap up this little book now (Definitely, there are parts I leave out, e.g., using netcat behind proxy.). The following material can be referred if someone wants to dig more into netcat:

(1) netcat manual;
(2) netcat source code;
(3) A project which extracts netcat source code and can be built and run on OpenBSD.

If this little book gives you a help, there are 2 methods you can express gratitude:
(1) Free - give this project a star on github;
(2) Non-free - Donate to OpenBSD.

If you think this tutorial is totally a crap, anyway, I admit it ......

Happy network hacking! Bye!