clap 3.2.0

A simple to use, efficient, and full-featured Command Line Argument Parser
Documentation 
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// Note: this requires the `cargo` feature

use clap::{arg, command};

fn main() {
    let matches = command!()
        .arg(arg!(-n --name <NAME>).required(false))
        .get_matches();

    println!("name: {:?}", matches.get_one::<String>("name"));
}