You have to consider who is reading that line and acting upon it. The answer is: the kernel. And it's not emulating a shell or a program like perl. So it isn't looking for names of environment variables.

So, you're barking up the wrong tree using this syntax. (But see the thread for alternative answers).

In reply to Re: Setting #! path using environment by JavaFan
in thread Setting #! path using environment by joec_

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