Rust echo

echo.rs

use clap::Parser;

/// Rust echo
#[derive(Parser, Debug)]
#[command()]
struct Args {
    /// Do not print the trailing newline character.
    #[arg(short, num_args(0), required(false), default_value_t = false)]
    no_newline: bool,
    
    /// The parameters to echo back to STDOUT
    #[arg(required(false), default_value = "", trailing_var_arg = true)]
    remaining: Vec<String>,
}

fn main() {
    let args = Args::parse();
    if args.no_newline {
        print!("{}", args.remaining.join(" "));
    } else {
        println!("{}", args.remaining.join(" "));
    }
    std::process::exit(0);
}