cheat sheets.

netcat

connect to tcp port 80:

 $ nc -v localhost 80
 Connection to localhost 80 port [tcp/http] succeeded!
 GET /
 ..

connect to udp port 9000:

 $ nc -v -u localhost 9000
 Connection to localhost 9000 port [udp/cslistener] succeeded!


listen on port 4000:

  $ nc -l 4000