code: public boolean deleteUser(String userName) {
  		// load user info from file
  		if (resourcePath != null) {
  
  			lock.writeLock().lock();
  			try {
  				File userDir = new File(resourcePath, "users");
  				if (userDir.isDirectory()) {
  					// get the file which corresponds to the user
  					File userFile = new File(userDir.getAbsolutePath(), userName);
  					return userFile.delete();
  				}
  			} finally {
  				lock.writeLock().unlock();
  			}
  		} // end if resourcePath not null
  		return false;
  	}
docs: Deletes the user from the disk
  
  @param userName
  @return True if successful.