How to set up a Netcat listener?

To set up a Netcat listener, follow these steps:

Open a Terminal: Launch your terminal application.
Run the Netcat Command: Type the following command and press Enter:
```
nc -l 12345
```
- -l: This option tells Netcat to listen for incoming connections.
- 12345: This is the port number you are using for the listener. You can choose any unused port number.
Wait for Connections: The terminal will appear to hang, indicating that it is waiting for a client to connect.
Test the Listener: Open another terminal window and connect to the listener using:
```
nc localhost 12345
```
You can now send messages from the second terminal, and they will appear in the first terminal where the listener is running.

If you have any questions or need further assistance, feel free to ask!