private String listFiles(final File cache, List<File> toDelete) throws Exception {
    boolean stopServices = false;
    if (toDelete == null) {
      toDelete = new ArrayList<File>();
    } else {
      stopServices = true;
    }
    int count = 0;
    Formatter f = new Formatter();

    f.format(" - Cache:%n    * %s%n", cache.getCanonicalPath());
    f.format(" - Commands:%n");
    for (CommandData cdata : getCommands(new File(cache, COMMANDS))) {
      f.format("    * %s \t0 handle for \"%s\"%n", cdata.bin, cdata.name);
      toDelete.add(new File(cdata.bin));
      count++;
    }
    f.format(" - Services:%n");
    for (ServiceData sdata : getServices(new File(cache, SERVICE))) {
      if (sdata != null) {
        f.format("    * %s \t0 service directory for \"%s\"%n", sdata.sdir, sdata.name);
        toDelete.add(new File(sdata.sdir));
        File initd = platform.getInitd(sdata);
        if (initd != null && initd.exists()) {
          f.format("    * %s \t0 init.d file for \"%s\"%n", initd.getCanonicalPath(), sdata.name);
          toDelete.add(initd);
        }
        if (stopServices) {
          Service s = getService(sdata);
          try {
            s.stop();
          } catch (Exception e) {
          }
        }
        count++;
      }
    }
    f.format("%n");

    String result = (count > 0) ? f.toString() : null;
    f.close();
    return result;
  }