code: public static boolean chmod(String as, File f, Set<ChmodBit> set)
  	{
  		return chmod(as, f, set, null);
  	}
docs: Performs a chmod (which assumes this system is Linux/UNIX/Solaris/etc), altering the permissions using symbols (ie. chmod
  o+w)
  
  @param f
  @param set
  The permissions to set on the file
  
  @return
  
  @throws IOException