unsetopt [ {+|-}options | {+|-}o option name ] [ name ...
]
       Unset the options for the shell.  All options spec
       ified  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 inter
       preted as glob  patterns),  and  all  options  with
       names matching these patterns are unset.
