| ```console |
| $ 04_02_validate --help |
| A simple to use, efficient, and full-featured Command Line Argument Parser |
| |
| Usage: 04_02_validate[EXE] <PORT> |
| |
| Arguments: |
| <PORT> Network port to use |
| |
| Options: |
| -h, --help Print help |
| -V, --version Print version |
| |
| $ 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'. |
| |
| ``` |
