Date:        Sun, 12 Nov 2017 16:10:35 -0600
    From:        Zhihao Yuan <z...@miator.net>
    Message-ID:  
<CAGsORuAhkQg9Ma8-J09dJgzsDXUSrh0GA=fcvf4z41rxy_u...@mail.gmail.com>


  | If I understand you correctly, what you need is actually $PWD,

Yes, that would do - either the two paths, $PWD, and the path
from that to the file (that which is there now), or the two combined
(and perhaps simplified) into the (or a) path name to the file.

kre

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