log-level is a basic command showing how to make use of go-command's middlewares.
go build$ ./log-level info Hello, world!
2024/12/26 22:57:13 INFO Hello, world!
$ ./log-level -level=warn info Hello, world!
<no output>
$ ./log-level -level=warn error Hello, world!
2024/12/26 22:58:07 ERROR Hello, world!