I've been away for awhile and I am answering posts in LIFO order.
At the end of the day, I do not recommend using a here-doc like shown to generate a binary byte sequence. There are other ways that "for sure" will work.

Of course a binary file doesn't always have printable ASCII characters.

In reply to Re^9: Error binmode() on unopened filehandle by Marshall
in thread Error binmode() on unopened filehandle by RedJeep

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