Determine the process pid listening on a certain port

Question

As the title says, I\'m running multiple game servers, and every of them has the same name but different PID and the port number. I would

Answer 1

Syntax:

kill -9 $(lsof -t -i:portnumber)

Example: To kill the process running at port 4200, run following command

kill -9 $(lsof -t -i:4200)

Tested in Ubuntu.