code: private void close() {
          // Out
          Cmd.closeIO(mOutStream);
          mOutStream = null;
          // Err
          Cmd.closeIO(mErrStream);
          mErrStream = null;
          // In
          Cmd.closeIO(mInStreamBuffer);
          mInStreamBuffer = null;
          Cmd.closeIO(mInStream);
          mInStream = null;
      }
docs: Close