nc:tldr:d7be0

The command "nc -u -l ${port}" is used to start a TCP/UDP network listener on a specified port number.

Here's what each element of the command means:

• nc: It stands for netcat, a utility used for reading and writing network connections. It is commonly used for network testing and debugging.
• -u: The -u option specifies that the network listener should use the UDP (User Datagram Protocol) instead of the default TCP (Transmission Control Protocol). UDP is a connectionless protocol that delivers data packets without guaranteed delivery or order.
• -l: The -l option tells netcat to listen for incoming connections rather than initiate a connection. This makes netcat act as a network server or listener.
• ${port}: This is a placeholder for the actual port number you want to use. Replace ${port} with the desired port number to specify the specific port you want to listen on. For example, if you want to listen on port 8080, you would replace ${port} with 8080.

Overall, the command "nc -u -l ${port}" starts a UDP network listener on the specified port number, allowing you to receive and process incoming UDP network traffic.