docs: public static Boolean askConfirm(Boolean confirm, String opDesc) throws IOException {
          if(confirm) {
              System.out.println("Confirmed " + opDesc + " in command-line.");
              return true;
          } else {
              System.out.println("Are you sure you want to " + opDesc + "? (yes/no)");
              BufferedReader buffer = new BufferedReader(new InputStreamReader(System.in));
              String text = buffer.readLine().toLowerCase(Locale.ENGLISH);
              boolean go = text.equals("yes") || text.equals("y");
              if (!go) {
                  System.out.println("Did not confirm; " + opDesc + " aborted.");
              }
              return go;
          }
      }