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  1. or download this
    # define option names and defaults
    our $UNIQUE_OPT         = q/unique/;
    ...
        die "-$UNIQUE_OPT and -$FORCE_OPT are mutually exclusive." 
          . " See $SCRIPT_NAME -help for syntax.";
    }
    
  2. or download this
    C:\>perl myscript stuff
    Error in option spec: "$VERBOSE_OPT"
    Error in option spec: "$FORCE_OPT"
    Error in option spec: "$OUTPUT_EXT_OPT=s"
    Error in option spec: "$UNIQUE_OPT"
    
  3. or download this
    my @option_config = split ' ',
                        qq( $UNIQUE_OPT
    ...
                            $VERBOSE_OPT
                            $OUTPUT_EXT_OPT=s
                          );
    
  4. or download this
    split(' ', q/STRING/);
    
  5. or download this
    my @option_config = qw" $UNIQUE_OPT
                            $FORCE_OPT
                            $VERBOSE_OPT
                            $OUTPUT_EXT_OPT=s
                          ";