From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <zsh-workers-return-37363-mason-zsh=primenet.com.au@zsh.org>
Received: (qmail 27844 invoked by alias); 9 Dec 2015 15:58:45 -0000
Mailing-List: contact zsh-workers-help@zsh.org; run by ezmlm
Precedence: bulk
X-No-Archive: yes
List-Id: Zsh Workers List <zsh-workers.zsh.org>
List-Post: <mailto:zsh-workers@zsh.org>
List-Help: <mailto:zsh-workers-help@zsh.org>
X-Seq: 37363
Received: (qmail 22284 invoked from network); 9 Dec 2015 15:58:27 -0000
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on f.primenet.com.au
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM,
	T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=date:from:to:cc:subject:message-id:mail-followup-to:references
         :mime-version:content-type:content-disposition:in-reply-to
         :user-agent;
        bh=MklRUi8XJ06DOzgaFMeBvTyay7pmQSq1nZnWTrc5NPE=;
        b=pbkM8gWaqCiuMwQotZeRGruQPyaSn023Myk0wTv7InZbrt1hqpx84RQCzzxQMaSyHp
         md4HD9TUI2Q2/c1hD03s0+zzRfm3GQPdWol6H+nWz7pgaEIIPu2rMqsHqrLSILYIwSr3
         Dldfv9mVknCk0pcmTXb5smW4MLK0KxmBzR2VtK3Y9As7PBfTrBbJBXMcqm5VUI/Hg1uK
         RaRqQYybK1fMJz8c6RjHkIxWb1QlHUJj7dFLip4wJYiP7Y0uI8aDQLK/kw3/a+GAzHBr
         uTwQyDwUPuAHXJacIRBMHnsX+zqojtZF2R6nnbHfv3rjhWla6LcIjSuhGq/Nrk062xEO
         KwlA==
X-Received: by 10.194.184.104 with SMTP id et8mr7310194wjc.87.1449676705421;
        Wed, 09 Dec 2015 07:58:25 -0800 (PST)
Date: Wed, 9 Dec 2015 15:58:23 +0000
From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Martijn Dekker <martijn@inlv.org>
Cc: zsh-workers@zsh.org
Subject: Re: Bug: [ "(" = ")" ] is true
Message-ID: <20151209155823.GA10749@chaz.gmail.com>
Mail-Followup-To: Martijn Dekker <martijn@inlv.org>, zsh-workers@zsh.org
References: <56684A0A.8010404@inlv.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <56684A0A.8010404@inlv.org>
User-Agent: Mutt/1.5.21 (2010-09-15)

2015-12-09 16:34:34 +0100, Martijn Dekker:
> There is a string comparison bug with `[' and `test'; the result is true
> if the first string starts with '(' and the second string starts with ')'.
> 
> $ [ "(" = ")" ] && echo oops || echo ok
> oops
> $ [ ")" = "(" ] && echo oops || echo ok
> ok
> $ [ "((" = "))" ] && echo oops || echo ok
> oops
> $ [ "((" = ")x" ] && echo oops || echo ok
> oops
> $ [ "(x" = ")" ] && echo oops || echo ok
> oops
> $ [ "x(" = ")" ] && echo oops || echo ok
> ok
> $ [ "(" = "x)" ] && echo oops || echo ok
> ok
> 
> This appears to be a long-standing bug. I confirmed it in:
> 
> zsh 4.3.6
> zsh 5.1.1
> zsh 5.2
> 
> I also found that the bug does *not* exist in zsh 4.1.1.
[...]

http://www.zsh.org/mla/users/2007/msg01223.html seems to be to
blame.

If the first argument starts with a "(" and the last one starts in
a ")", they are both removed.

So all operators are affected not just "=" ([ "(file1)" -nt
")file2(" ]...)

-- 
Stephane