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use strict;
use warnings;
...
die "can't open output file: $!" unless open FH, ">$output";
printf(FH "%s\n", "there won't be any junk characters in this version"
+);
close FH;

use strict;
use warnings;
...
printf(FH "%s\r\n", "I wonder any junk charcter will be printed to the
+ file on windows");
close FH;