nc

Netcat is a versatile utility for working with TCP or UDP data.

• Listen on a specified port and print any data received:

nc -l {port}

• Connect to a certain port:

nc {ip_address} {port}

• Set a timeout:

nc -w {timeout_in_seconds} {ipaddress} {port}

• Keep the server up after the client detaches:

nc -k -l {port}

• Keep the client up even after EOF:

nc -q {timeout} {ip_address}

• Scan the open ports of a specified host:

nc -v -z {ip_address} {port}

• Act as proxy and forward data from a local TCP port to the given remote host:

nc -l {local_port} | nc {hostname} {remote_port}

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