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21 lines
722 B
Markdown
21 lines
722 B
Markdown
# Occupy A Local Port With Netcat
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The `netcat` (`nc`) utility can listen to a specific port on your local
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machine. This, in effect, occupies that port. This is handy for a variety of
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reasons. In my case, I find it useful for testing out a web server script that
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can gracefully react to its desired port being occupied.
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The `-l` flag is how you tell `nc` to listen. Then you specify `localhost` as
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the host and whatever port you want to occupy after that.
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```bash
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$ nc -l localhost 5000
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```
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Now if I try to run my web server script for port `5000`, I see the `Address
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already in use` error.
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See `nc -h` for more details.
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[source](https://twitter.com/jbrancha/status/1566820110366654474?s=20&t=HcUMm1aRXpEgCAzONhy34w)
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