Path: csiph.com!optima2.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!1.eu.feeder.erje.net!news2.arglkargh.de!news.glorb.com!usenet.stanford.edu!not-for-mail
From: Linda Walsh <bash@tlinx.org>
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, 02 Aug 2015 15:11:17 -0700
Lines: 22
Approved: bug-bash@gnu.org
Message-ID: <mailman.7771.1438553489.904.bug-bash@gnu.org>
References: <55BE6FB8.4080200@tlinx.org> <55BE759D.8030700@gmail.com>
NNTP-Posting-Host: lists.gnu.org
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
X-Trace: usenet.stanford.edu 1438553489 15618 208.118.235.17 (2 Aug 2015 22:11:29 GMT)
X-Complaints-To: action@cs.stanford.edu
To: Charles Daffern <seejay.11@gmail.com>, bug-bash <bug-bash@gnu.org>
Envelope-to: bug-bash@gnu.org
User-Agent: Thunderbird
In-Reply-To: <55BE759D.8030700@gmail.com>
X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x (no timestamps) [generic]
X-Received-From: 173.164.175.65
X-BeenThere: bug-bash@gnu.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Bug reports for the GNU Bourne Again SHell <bug-bash.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/bug-bash>, <mailto:bug-bash-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/bug-bash>
List-Post: <mailto:bug-bash@gnu.org>
List-Help: <mailto:bug-bash-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/bug-bash>, <mailto:bug-bash-request@gnu.org?subject=subscribe>
Xref: csiph.com gnu.bash.bug:11282



Charles Daffern wrote:
> On 02/08/15 20:30, Linda Walsh wrote:
>>>  if [[ $(printf "\n") == $'\n' ]]; then echo T; else echo F; fi
>> F
> 
> The command substitution operators ($(...) and `...`) strip all trailing
> linefeeds. You are left with an empty string here.
> 
> The usual workarounds I see (where necessary) are hacks like this:
> 
> variable=$(command; echo x); variable=${variable%?x}
----
	I see what you mean --- erk...
I think the process substitution doesn't, since you need
to explicitly use a -t switch if you want to strip the "\n"'s off

Thanks!