<pre><code>$ lsof -i -n -P | grep TCP | grep 4000
beam.smp 28569 mnishiguchi 49u IPv4 0x4d3d8b73de14af89 0t0 TCP *:4000 (LISTEN)

$ kill -9 28569
</code></pre><h2 id="resources">Resources</h2>
<ul>
<li><a target="_blank" href="https://help.extensis.com/hc/en-us/articles/360004935154-Identifying-ports-in-use-on-Mac-and-Windows-Operating-Systems">Identifying ports in use on Mac and Windows Operating Systems</a></li>
</ul>

```
$ 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](https://help.extensis.com/hc/en-us/articles/360004935154-Identifying-ports-in-use-on-Mac-and-Windows-Operating-Systems)

Masatoshi Nishiguchi's Blog

Identifying ports already in use

Resources