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.