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04_02_parse.md

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$ 04_02_parse --help
A simple to use, efficient, and full-featured Command Line Argument Parser

Usage:
    04_02_parse[EXE] <PORT>

Arguments:
    <PORT>    Network port to use

Options:
    -h, --help       Print help information
    -V, --version    Print version information

$ 04_02_parse 22
PORT = 22

$ 04_02_parse foobar
? failed
error: Invalid value "foobar" for '<PORT>': invalid digit found in string

For more information try --help

$ 04_02_parse_derive 0
? failed
error: Invalid value "0" for '<PORT>': 0 is not in 1..=65535

For more information try --help