POSIX echo

echo.rs

fn unwords(args: &[~str]) -> ~str {
    return str::connect(args, " ");
}

fn echo(args: &[~str]) {
    match args.tail() {
        [~"-n", ..strs] => print(unwords(strs)),
        strs => println(unwords(strs)),
    }
}

fn main() {
    echo(os::args());
}