@Override
  public void toFile(File file) throws IOException {
    try (FileOutputStream out = new FileOutputStream(file)) {
      toProperties().store(out, null);
    }
  }
Gets all the GemFire properties defined using file(s)

@return Map of GemFire properties and values set using property files
geode-core/src/main/java/org/apache/geode/internal/AbstractConfig.java