clap 4.0.0

A simple to use, efficient, and full-featured Command Line Argument Parser
Documentation 
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use clap::{command, Arg, ArgAction};

fn main() {
    let matches = command!() // requires `cargo` feature
        .arg(Arg::new("name").action(ArgAction::Append))
        .get_matches();

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