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```console
$ 04_02_validate --help
clap [..]
A simple to use, efficient, and full-featured Command Line Argument Parser
USAGE:
04_02_validate[EXE] <PORT>
ARGS:
<PORT> Network port to use
OPTIONS:
-h, --help Print help information
-V, --version Print version information
$ 04_02_validate 22
PORT = 22
$ 04_02_validate foobar
? failed
error: Invalid value "foobar" for '<PORT>': `foobar` isn't a port number
For more information try --help
$ 04_02_validate 0
? failed
error: Invalid value "0" for '<PORT>': Port not in range 1-65535
For more information try --help
```
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