abdullah/til
1
0
Fork 0
mirror of https://github.com/jbranchaud/til synced 2026-01-03 07:08:01 +00:00
Code Issues Projects Releases Wiki Activity

Add Occupy A Local Port With Netcat as a Unix TIL

Browse Source
This commit is contained in:
jbranchaud
2022-09-05 11:27:30 -05:00
parent f4eabeb0a2
commit 83518198c8
2 changed files with 22 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
unix/occupy-a-local-port-with-netcat.md Normal file
View File

@@ -0,0 +1,20 @@
# Occupy A Local Port With Netcat
The `netcat` (`nc`) utility can listen to a specific port on your local
machine. This, in effect, occupies that port. This is handy for a variety of
reasons. In my case, I find it useful for testing out a web server script that
can gracefully react to its desired port being occupied.
The `-l` flag is how you tell `nc` to listen. Then you specify `localhost` as
the host and whatever port you want to occupy after that.
```bash
$ nc -l localhost 5000
```
Now if I try to run my web server script for port `5000`, I see the `Address
already in use` error.
See `nc -h` for more details.
[source](https://twitter.com/jbrancha/status/1566820110366654474?s=20&t=HcUMm1aRXpEgCAzONhy34w)