public static void main(String[] args) throws IOException {

    if (args.length == 0) {
      usage();
      ExitCode.FATAL.doSystemExit();
    }

    File outputFile = new File(args[0]);

    File[] files = new File[args.length - 1];
    for (int i = 1; i < args.length; i++) {
      String fileName = args[i];
      File file = new File(fileName);
      files[i - 1] = file;
    }

    try (FileOutputStream fileOutputStream = new FileOutputStream(outputFile);
        BufferedOutputStream output = new BufferedOutputStream(fileOutputStream)) {
      convertFiles(output, files);
    }
  }
A utility to convert existing gemfire logs into a graph logger file. This will help me debug
hydra runs more quickly.
geode-core/src/main/java/org/apache/geode/internal/sequencelog/io/GemfireLogConverter.java