set [ {+|-}options | {+|-}o [ option_name ] ] ... [ {+|-}A [ name ] ]
    [ arg ... ]
       Set  the options for the shell and/or set the positional parameters,
       or declare and set an array.  If the -s option is given,  it  causes
       the  specified  arguments  to be sorted before assigning them to the
       positional parameters (or to the array name if -A is used).  With +s
       sort arguments in descending order.  For the meaning  of  the  other
       flags,  see zshoptions(1).  Flags may be specified by name using the
       -o option. If no option name is supplied with -o, the current option
       states are printed:  see the description of setopt  below  for  more
       information  on the format.  With +o they are printed in a form that
       can be used as input to the shell.

       If the -A flag is specified, name is set to an array containing  the
       given args; if no name is specified, all arrays are printed together
       with their values.

       If +A is used and name is an array, the given arguments will replace
       the initial elements of that array; if no name is specified, all ar-
       rays are printed without their values.

       The  behaviour  of  arguments  after  -A  name or +A name depends on
       whether the option KSH_ARRAYS is set.  If it is not set,  all  argu-
       ments following name are treated as values for the array, regardless
       of  their form.  If the option is set, normal option processing con-
       tinues at that point; only regular arguments are treated  as  values
       for the array.  This means that

              set -A array -x -- foo

       sets array to `-x -- foo' if KSH_ARRAYS is not set, but sets the ar-
       ray to foo and turns on the option `-x' if it is set.

       If  the  -A  flag is not present, but there are arguments beyond the
       options, the positional parameters are set.  If the option list  (if
       any)  is terminated by `--', and there are no further arguments, the
       positional parameters will be unset.

       If no arguments and no `--' are given, then the names and values  of
       all  parameters are printed on the standard output.  If the only ar-
       gument is `+', the names of all parameters are printed.

       For historical reasons, `set -' is treated as `set +xv' and  `set  -
       args'  as  `set  +xv  -- args' when in any other emulation mode than
       zsh's native mode.
