No, I mean that such environment variables affect shell escaping.

On Aug 17, 2016 10:21 PM, "Noam Postavsky" <npostavs@users.sourceforge.net>
wrote:

> On Wed, Aug 17, 2016 at 10:02 PM, Demi Obenour <demiobenour@gmail.com>
> wrote:
> > But *nix has no such feature, nor the associated gotcha.
>
> By "feature" you mean having variables whose name ends in a caret (or
> other escape character)? It's true that existing *nix shells don't,
> but the OS does support them (and so hypothetical shells could do as
> well):
>
> (let ((process-environment (cons "ca^=with-caret" process-environment)))
>   (shell-command-to-string "python -c 'import
> os;print(os.environ[\"ca^\"])'")) ;=> "with-caret\n"
>