set [ {+|-}options | {+|-}o [ option_name ] ] ... [ {+|-}A [ name ] ]
    [ arg ... ]
       Set the options for the shell and/or set the positional  parame-
       ters,  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 sup-
       plied  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 re-
       place the initial elements of that array; if no name  is  speci-
       fied, all arrays 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 ar-
       guments following name are treated as values for the array,  re-
       gardless  of  their  form.   If the option is set, normal option
       processing continues 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
       array 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 argument 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.