MacOS

Every so often I get stuck with a running process that’s using a specific port, preventing me from running some new application that uses the same port. Then I’m left Googling for solutions or rebooting the machine to make progress. But not any more! I’m recording the solution for my future self (and of course for you, dear reader). > sudo lsof -i :<PortNumber> # returns list of processes using the port, with PID > kill -9 <PID> # kill the specific pid For example, you can find out what’s running on port number 8080 by running the command: ...