The command nc localhost 12345 uses the nc (Netcat) utility to establish a connection to a network service running on the local machine (localhost) at port 12345. Here's how it works:
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Netcat (nc): This is a versatile networking tool that can read and write data across network connections using TCP or UDP protocols.
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localhost: This refers to the local machine. It is a hostname that translates to the IP address
127.0.0.1. -
12345: This is the port number on which the service is listening for incoming connections.
When you run the command, Netcat attempts to connect to the specified port (12345) on the localhost. If there is a service listening on that port, you will establish a connection, and you can send and receive data through that connection. If no service is listening on that port, you will receive an error indicating that the connection was refused.
This command is often used for testing and debugging network services.
