private static void revokePermissions(final File f) {
FileUtil.setWritable(f, false);
FileUtil.setExecutable(f, false);
FileUtil.setReadable(f, false);
}
private static void grantPermissions(final File f) {
FileUtil.setReadable(f, true);
FileUtil.setWritable(f, true);
FileUtil.setExecutable(f, true);
}