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From: Martin Vaeth <martin@mvath.de>
Subject: Re: convolutions
Date: Sat, 7 Nov 2015 17:17:54 +0000 (UTC)
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Bart Schaefer <schaefer@brasslantern.com> wrote:
> If you really want to replace exactly
> and only the specific references to color variables, you need
> something like Zyx's sed expression.

Or envsubst from gettext.
In fact, envsubst was exactly written for the purpose of
*safely* expanding variables (and *only* that).