I used recently to navigate a quite complex Bash script. This is using Codex.

I'd go just below the line that I don't understand and type

    # Explain the line above in detail: << gpt explanation >>

And it'd write a very decent explanation that makes sense most of the time. Basically decrypting bash code, which I suck at.

However, there was one instance where it almost freaked me out as the output was quite human like:

    # Explain the line above: <<I don't understand it>>.