찾기
lsof -i :포트번호
ex.
lsof -i :8000
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
node 1234 shaking 15u IPv4 0x1f23462a48d69d65 0t0 TCP localhost:cslistener (LISTEN)
Kill 하기
kill -9
ex.
kill -9 1234
참고사이트 : http://stackoverflow.com/questions/3855127/find-and-kill-process-locking-port-3000-on-mac