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From: Greg Wooledge <wooledg@eeg.ccf.org>
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Subject: Re: BUG?: (or what's going on?) test for NL == NL fails	(bash-4.3.39(3)-release)
Date: Mon, 3 Aug 2015 07:59:44 -0400
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On Sun, Aug 02, 2015 at 01:30:14PM -0700, Linda Walsh wrote:
> isatty () { test -c /proc/self/fd/1 ; }

This can be done portably with test -t 1 if you want the body of the
function to do what the name implies.  (Testing for a character device
gives false positives if stdout is a tape drive or similar device.)