@Override
  public int complete(String buf, int pos, List cand) {
    try {
      return new StringsCompleter(propertyNames()).complete(buf, pos, cand);
    } catch (Exception e) {
      beeLine.handleException(e);
      return -1;
    }
  }
The save directory if HOME/.beeline/ on UNIX, and
HOME/beeline/ on Windows.
beeline/src/java/org/apache/hive/beeline/BeeLineOpts.java