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sub parse_options {    # \%options_we_can_write, \@lines_of_options_fi
+le. [ $die_on_extra_options ] 
    #loads all matching values from an array of lines into the options
+ hash
...
    }
    return 0;
}

if( defined ($fd = $3) eq "" ){ $fd = "" };

if( defined ($fd = $3) eq "" ){ $fd = "ssssssssss" };