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til/unix/watch-the-difference.md
2015-10-11 12:23:41 -05:00

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# Watch The Difference
The `watch` command is a simple way to repeatedly run a particular command.
I'll sometimes use it to monitor the response from some endpoint. `watch`
can make monitoring responses even easier when the `-d` flag is employed.
This flag instructs `watch` to highlight the parts of the output that are
*different* from the previous run of the command.
So if I run
```
$ watch -d curl -LIs localhost:3000
```
I can easily see if the http status of the request changes.