private String getFileNamePrefix() {
      String timeStamp = new java.sql.Time(System.currentTimeMillis()).toString();
      timeStamp = timeStamp.replace(':', '_');
      return fileNamePrefix + "-" + timeStamp;
    }
HeadlessGfshConfig for tests. Taken from TestableGfsh
geode-dunit/src/main/java/org/apache/geode/management/internal/cli/HeadlessGfsh.java