main.rs

use std::env;

fn main() -> std::io::Result<()>{

    let together = "Good morning ".to_owned();
    print!("{}", together);

    match env::var("USER") {
        Ok(val) => print!("{}", val),
        Err(e) => print!("err: {}", e),
    }
    
    let t = " on ".to_owned();
    print!("{}", t);
    
    match env::var("HOSTNAME") {
        Ok(val) => print!("{}", val),
        Err(e) => print!("err: {}", e),
    }
    
    let tt = ". The current directory is ".to_owned();
    print!("{}", tt);
    
    let path = env::current_dir()?;
    print!("{}.", path.display());
    Ok(())
}