nc

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}}