X-Recipient: archive-cygwin@delorie.com X-Spam-Check-By: sourceware.org Date: Tue, 12 Aug 2008 17:40:59 +0200 From: Corinna Vinschen To: cygwin@cygwin.com Cc: Dmitry Semyonov Subject: Re: ash-20040127-3: Invalid behavior of negated pipeline Message-ID: <20080812154059.GS5129@calimero.vinschen.de> Reply-To: cygwin@cygwin.com Mail-Followup-To: cygwin@cygwin.com, Dmitry Semyonov References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.16 (2007-06-09) Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com On Aug 12 19:36, Dmitry Semyonov wrote: > Hello all, > > -- begin -- > $ bash -c '! true | false; echo $?' > 0 > > $ ash -c '! true | false; echo $?' > 1 > -- end -- > > Mostly "if" conditions are affected by this issue. > > Quote[1] from the "Shell Command Language" standard: "If the reserved > word ! does not precede the pipeline, the exit status shall be the > exit status of the last command specified in the pipeline. Otherwise, > the exit status shall be the logical NOT of the exit status of the > last command. That is, if the last command returns zero, the exit > status shall be 1; if the last command returns greater than zero, the > exit status shall be zero." > > [1] http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_09_02 > > > So, in this particular case, ash is not compliant with the standard, > nor it is compatible with bash or dash (Debian ash derivative). Use bash as sh. ash is only in the distro to run rebaseall. I won't release a new version of ash any time soon, if it doesn't explicitely affect rebase. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- 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/