unsetopt  [ {+|-}options | {+|-}o option name ] [ name ...
]

       Unset the  options  for  the  shell.   All  options
       with   flags or by name are unset.  If no arguments
       the names of all options currently unset are print-
       flag   is given the arguments are taken as patterns
(which should

       be quoted to preserve them from  being  interpreted
       terns),  and  all options with names matching these
       unset.
