[/users/pbb/old_hw/algebra/]
       
   DIR ..                                                                             
   DIR ec                                                 2006-Jul-31 00:11   --------
   DIR hw1                                                2006-Jul-31 00:11   --------
   DIR hw2                                                2006-Jul-31 00:11   --------
   DIR hw3                                                2006-Jul-31 00:11   --------