unsetopt [ {+|-}options | {+|-}o option name ] [ name ...
]
       Unset  the  options  for  the  shell.   All options
       specified either with flags or by name  are  unset.
       If  no  arguments  are  supplied,  the names of all
       options currently unset are  printed.   If  the  -m
       flag  is  given the arguments are taken as patterns
       (which should be quoted to preserve them from being
       interpreted as glob patterns), and all options with
       names matching these patterns are unset.
