15

I am trying to run a GAE app on localhost:8080, but it was apparently occupied, even after shutting down and restarting my computer. I ran sudo lsof -i :8080. Lo and behold there is something sill running with PID 66. What can I do to kill that process and free up 8080 again?

8
  1. Find out what Process ID (pid) is using the required port (e.g port 5434).

    ps aux | grep 5434
    
  2. Kill that process:

    kill -9 <pid>
    
7

lsof -i @localhost:8080

kill -9 <<PID>>

  • While this may work, it repeats what the OP posted and could use an explanation. – bertieb Sep 24 '15 at 14:30
  • This answer is the most clear and has best feedback in terminal! ps aux | grep 5434 doesn't say at all which is the PID!! – mesqueeb Oct 4 '18 at 8:03
  • Nothing happens when I enter lsof -i @localhost:8080 – shim Oct 17 at 15:03
5

Turns out it's just kill -9 PID, you might need sudo. Found the answer on maclife.com in the article Terminal 101: Track and Kill Processes.

2

Merging answers from above in one line: kill $(lsof -t -i:8080)

lsof -t returns the PID and passes that to kill.

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