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From: "Chris F.A. Johnson" <chris@cfajohnson.com>
Newsgroups: gnu.bash.bug
Subject: Re: BUG?: (or what's going on?) test for NL == NL fails (bash-4.3.39(3)-release)
Date: Sun, 2 Aug 2015 17:27:55 -0400 (EDT)
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On Sun, 2 Aug 2015, Linda Walsh wrote:

>
> also noticed this similar strange behavior:
>
> used 'ord'** for this test (trying to compare decimal val of chars)
>
> isatty () { test -c /proc/self/fd/1 ; }
> ord () { local nl=""; isatty && nl="\n"; printf "%d$nl" "'$1" ; } ord () { local nl=""; isatty && nl="\n"; printf "%d$nl" "'$1" ; } 
>> ord "$(printf "\n")"

    Trailing newline are stripped from command substitution, making "$(printf "\n")" and empty string.

    If you want a newline, use:

ord $'\n'

-- 
Chris F.A. Johnson, <http://cfajohnson.com>