The netstat command on Linux shows you any active and listening network connections on the computer. If there is a connection active that you are not sure what it is, you can use the ‘-p’ (or ‘–programs’) parameter to show the process id (PID) and process name of the network connection/socket.
Example:
Note: to use the -p parameter, you need to have root privileges, otherwise the ‘PID/Program name’ field will just display ‘-‘.
