Reads and writes tcp or udp data.

• Listen on a specified port:
  nc -l port
• Connect to a certain port (you can then write to this port):
  nc ip_address port
• Set a timeout:
  nc -w timeout_in_seconds ipaddress port
• Serve a file:
  nc -l port < file
• Receive a file:
  nc ip_address port > file
• Server stay up after client detach:
  nc -k -l port
• Client stay up after EOF:
  nc -q timeout ip_address
• Port scanning:
  nc -v -z ip_address port
• Proxy and port forwarding:
  nc -l port | nc hostname port

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