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Change the zsh heading to unix.

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jbranchaud
2015-10-11 12:23:41 -05:00
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unix/check-if-a-port-is-in-use.md Normal file
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# Check If A Port Is In Use
The `lsof` command is used to *list open files*. This includes listing
network connections. This means I can check if a particular port is in use
and what process is using that port. For instance, I can check if my rails
application is currently running on port 3000.
```
$ lsof -i TCP:3000
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
ruby 13821 jbranchaud 12u IPv6 0xdf2e9fd346cc12b5 0t0 TCP localhost:hbci (LISTEN)
ruby 13821 jbranchaud 13u IPv4 0xdf2e9fd33ca74d65 0t0 TCP localhost:hbci (LISTEN)
```
I can see that a ruby process (my rails app) is using port 3000. The PID
and a number of other details are included.
See more details with `man lsof`.
h/t [Mike Chau](https://twitter.com/money_mikec)