No solution was given in any ancestor to your post. I don't even know what you're disagreeing with. I humoured your games, but now it's time for you to be clear. Do you disagree with any of the following?

• Your bash was incorrectly built.
• Your bash being incorrectly built does not speak to the portability of the /dev/fd method.
• The portability of the /dev/fd solution is not related to the portability of bash.
• /dev/fd is not portable between OSs or even between systems with the same OS.
• Named pipes are quite portable.

If so, let's discuss that. If not, then we're off topic.

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