let untar_opts = &App::new("tar_api")
    .subcommand(
      SubCommand::with_name("untar")
        .arg(Arg::with_name("file").required(true).takes_value(
          true,
        ))
        .arg(Arg::with_name("dest").required(true).takes_value(
          true,
        ))
    ).get_matches();