stdin, stdout, stderr, 3

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I have a program sending/receiving data to/from my CLI script using:

0 stdin
1 stdout
2 stderr
3 ??????

0, 1, and 2 are trivial.

How do I access 3?

I tried /dev/fd/3 and failed to open it...

Got no error messages about why it failed to open, it just failed.

Am I missing something?

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