Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Date:	Fri, 19 Aug 2005 15:12:35 -0400
From:	Christopher Faylor <cgf-no-personal-reply-please AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: bash test -n && test -z return tru
Message-ID:	<20050819191235.GA19495@trixie.casa.cgf.cx>
Reply-To:	cygwin AT cygwin DOT com
References:	<43062C7F DOT 8010906 AT pooryorick DOT com>
Mime-Version:	1.0
In-Reply-To:	<43062C7F.8010906@pooryorick.com>
User-Agent:	Mutt/1.5.8i

On Fri, Aug 19, 2005 at 03:01:19PM -0400, Poor Yorick wrote:
>from reading the bash man pages, I would have thought the -n and -z were 
>mutually exclusive.  Therefore I don't understand this result:
>
>~>$ [ -n $(which nonexisingfilename 2>/dev/null) ] && [ -z $(which 
>nonexistingfilename 2&>/dev/null) ]  && echo hello
>hello
>~>$
>
>can anyone help explain this?

This defaults to

  [ -n ] && [ -z ] && echo hello

I would have expected a syntax error in that case.

Regardless of that, however, if you want to actually make this work you
need to do something like:

  [ -n "$(which nonexisingfilename 2>/dev/null)" ]

cgf

--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/

- Raw text -