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From: Raffaele Ricciardi <rfflrccrd@gmail.com>
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Subject: Re: Examining the output of a shell command?
Date: Mon, 29 Jun 2015 17:56:21 +0200
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On 29/06/15 16:51, Eli Zaretskii wrote:
>>       #!/bin/bash
>>
>>       export GREP_COLORS="mt=01;31:fn=:ln=:bn=:se=:sl=:cx=:ne"
>>       export GREP_OPTIONS="--color=auto"
>                                      ^^^^
> Did you try with --color=always?

This.  Thank you.

And yet, in my tests, apparently Emacs was calling `grep` with 
"--color=auto" instead.  But maybe I was missing some other settings.
Never mind.