public String sendCommand(String commandString) {
    String result = "";

    if (checkRoot()) {
      CommandCapture command = new CommandCapture(0, commandString);
      try {
        RootTools.getShell(true).add(command).waitForFinish();
        result = command.toString();
        LAST_COMMAND_OUTPUT = result;
        LAST_EXIT_CODE = command.exitCode();
      } catch (InterruptedException e) {
        // TODO: Do something useful with the exceptions
        // e.printStackTrace();
      } catch (IOException e) {
        // e.printStackTrace();
      } catch (TimeoutException e) {
        // e.printStackTrace();
      } catch (RootDeniedException e) {
        // e.printStackTrace();
      }
    }
    return result;
  }