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Owing to its versatile functionalities, netcat earns the reputation as "TCP/IP Swiss army knife". For example, you can create a simple chat app using netcat:

(1) Open a terminal and input following command:

# nc -l 3003
This means a netcat process will listen on 3003 port in this machine (the IP address of current machine is 192.168.35.176).

(2) Connect aforemontioned netcat process in another machine, and send a greeting:

# nc 192.168.35.176 3003
hello
Then in the first machine's terminal, you will see the "hello" text:

# nc -l 3003
hello