Killing a process on Mac

If you are debugging with Xdebug on your Mac, the following terminal codes may work.
Which application is running on which port?

sudo lsof -i :9000 # checks port 9000
COMMAND PID USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME

java     53 root   19u  IPv6                   0t0  TCP *:cslistener (LISTEN)

To kill the process with PID;

sudo kill 53