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  1. or download this
    seek $fh, $offset, SEEK_SET or die "$fn: D'Oh! $!\n";
read $fh, my $cont, $LEN;
seek $fh, $offset, SEEK_SET or die "$fn: D'Oh! $!\n";
print $fh $cont ^ join '', map chr( rand 0x100 ), 1 .. $LEN;
  2. or download this
    #!/usr/bin/perl

...
print $fh map chr rand 0x100, 1 .. $LEN;

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