clap 3.1.9

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!([NAME]).default_value("alice"))
        .get_matches();

    println!(
        "NAME: {:?}",
        matches
            .value_of("NAME")
            .expect("default ensures there is always a value")
    );
}