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From: Dan Espen <despen@verizon.net>
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Subject: Re: Examining the output of a shell command?
Date: Sun, 28 Jun 2015 13:17:53 -0400
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Michael Heerdegen <michael_heerdegen@web.de> writes:

> Dan Espen <despen@verizon.net> writes:
>
>> Maybe the OP doesn't realize that some programs that output
>> escape sequences won't do so when run as an Emacs shell command.
>>
>> /bin/ls being a good example.
>>
>> In that case, run:
>>
>> /bin/ls --color
>>
>> as an Emacs shell command.
>
> I guess programs like "ls" check the TERM environment variable.
>
> Try:
>
> (setenv "TERM" "xterm")

I doubt $TERM is the key.
/bin/ls knows when it is interactive.

> (shell-command-to-string "ls --color")

This will show escape sequences regardless of $TERM.
It did for me with the Emacs default value "dumb".

-- 
Dan Espen