Identifying ports already in use
$ lsof -i -n -P | grep TCP | grep 4000 beam.smp 28569 mnishiguchi 49u IPv4 0x4d3d8b73de14af89 0t0 TCP *:4000 (LISTEN) $ kill -9 28569 Resources Identifying ports in use on Mac and Windows Operating Systems
Feb 9, 20211 min read12