code: public static void main(String[] args) {
      if (args.length < 1) {
        System.err.printf("$ java ... %s environmentVariable [environmentVariable]*%n",
          GetEnvironmentVariableValue.class.getName());
        System.exit(1);
      }
  
      Arrays.stream(args).forEach(environmentVariable ->
        System.out.println(newEnvironmentVariableValue(environmentVariable)));
    }
docs: /* (non-Javadoc)