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.
