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