Hello command line

Cargo.toml

[package]
name = "hello"
version = "0.1.0"
authors = ["J. Cliff Dyer <jcd@sdf.org>"]

[dependencies]
clap = "~2"

src-main.rs

extern crate clap;

use clap::{App, Arg};


fn main() {
    let matches = App::new("Hello World")
        //.author("Triangle Rustaceans")
        //.about("Say hello.")
        //.version("1.0")
        .arg(Arg::with_name("name")
             .short("n")
             .long("name")
             //.value_name("NAME")
             //.help("Who do you want to greet?")
             .takes_value(true))
        .get_matches();
    let greetee = matches.value_of("name").unwrap_or("world");
    println!("Hello {}!", greetee);
}