How to redirect a program that writes to tty?

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Try this:

script -q -c 'module help null' /dev/null > aaa.txt

This works in a shell script (non-interactively) using 

$ script --version
script (util-linux-ng 2.16)

You may also be able to use expect.

Also see: Catching a direct redirect to /dev/tty.

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