From mboxrd@z Thu Jan  1 00:00:00 1970
From: Grant Rettke <gcr@wisdomandwonder.com>
Subject: Re: environmental variables in links in org
Date: Sun, 15 Nov 2015 22:03:33 +0800
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To: Zhihao Ding <zhihao.ding@gmail.com>
Cc: "emacs-orgmode@gnu.org" <emacs-orgmode@gnu.org>

On Thu, Nov 5, 2015 at 7:16 PM, Zhihao Ding <zhihao.ding@gmail.com> wrote:
> Is it a good idea to use environment variables in the links referenced in a
> org file?  e.g.
>
> [[$mydata/myfigure.pdf]]

How do you want Org to behave when the user clicks the link?

> If so how to achieve this?

I would try in-line source blocks.