How to use Gnupg's passphrase-fd argument?

Question

I would like to use GnuPG´s decrypt command without any user interation. The script\'s --passphrase-fd argument seems exactly what I need. But I do

Answer 1

Using GPG4win/gpg 2.2.3: to use the passphrase-fd 0 and bypass the prompt, I can confirm that the following works:

--pinentry-mode loopback