

          chown owner|{owner group} filelist
               Set owner of each file in the list filelist to owner,
               which can be a user name or numeric user id.  If the
               first parameter is a list, then the owner is set to the
               first element of the list and the group is set to the
               second element.  Group can be a group name or numeric
               group id.  If group is {}, then the file group will be
               set to the login group of the specified user.
