private static void usage(String s) {
    err.println(lineSeparator() + "** " + s + lineSeparator());
    err.println("Usage: java SortLogFile logFile");
    err.println("-sortedFile file " + "File in which to put sorted log");
    err.println();
    err.println(
        "Sorts a GemFire log file by timestamp. The merged log file is written to System.out (or a file).");
    err.println();
    ExitCode.FATAL.doSystemExit();
  }
Prints usage information about this program
geode-core/src/main/java/org/apache/geode/internal/logging/SortLogFile.java