From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 25850 invoked from network); 9 Jul 2009 21:17:40 -0000 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on f.primenet.com.au X-Spam-Level: X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00 autolearn=ham version=3.2.5 Received: from new-brage.dotsrc.org (HELO a.mx.sunsite.dk) (130.225.254.104) by ns1.primenet.com.au with SMTP; 9 Jul 2009 21:17:40 -0000 Received-SPF: none (ns1.primenet.com.au: domain at sunsite.dk does not designate permitted sender hosts) Received: (qmail 96623 invoked from network); 9 Jul 2009 21:17:32 -0000 Received: from sunsite.dk (130.225.247.90) by a.mx.sunsite.dk with SMTP; 9 Jul 2009 21:17:32 -0000 Received: (qmail 24251 invoked by alias); 9 Jul 2009 21:17:23 -0000 Mailing-List: contact zsh-workers-help@sunsite.dk; run by ezmlm Precedence: bulk X-No-Archive: yes X-Seq: 27113 Received: (qmail 24226 invoked from network); 9 Jul 2009 21:17:22 -0000 Received: from bifrost.dotsrc.org (130.225.254.106) by sunsite.dk with SMTP; 9 Jul 2009 21:17:22 -0000 Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by bifrost.dotsrc.org (Postfix) with ESMTPS id A0B5080307FA for ; Thu, 9 Jul 2009 23:17:18 +0200 (CEST) Received: from list by ciao.gmane.org with local (Exim 4.43) id 1MP0zU-0003ro-S4 for zsh-workers@sunsite.dk; Thu, 09 Jul 2009 21:17:17 +0000 Received: from l3-128-170-36-102.l-3com.com ([128.170.36.102]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 09 Jul 2009 21:17:16 +0000 Received: from ebb9 by l3-128-170-36-102.l-3com.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 09 Jul 2009 21:17:16 +0000 X-Injected-Via-Gmane: http://gmane.org/ To: zsh-workers@sunsite.dk From: Eric Blake Subject: Re: bug: $? after empty command Date: Thu, 9 Jul 2009 21:17:03 +0000 (UTC) Message-ID: References: <20090709154124.2cd2a227@news01> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: main.gmane.org User-Agent: Loom/3.14 (http://gmane.org/) X-Loom-IP: 128.170.36.102 (Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.11) Gecko/2009060215 Firefox/3.0.11 (.NET CLR 3.5.30729)) Sender: news X-Virus-Scanned: ClamAV 0.94.2/9551/Thu Jul 9 15:22:08 2009 on bifrost X-Virus-Status: Clean Peter Stephenson csr.com> writes: > > POSIX requires that the execution of an empty command change $? to 0, as > > shown here with bash: > > > > $ zsh -c 'foo=; false; $foo; echo $?' > > 1 > > I'm not aware that that's deliberate shell behaviour, and indeed I > wouldn't have expected it. It *is* deliberate behaviour that the status is > not reset simply by hitting return at the interactive prompt, but that's > actually a different issue, not affected by the following. Good point about making the behavior dependent on a non-empty command line, and that the exit status of command substitution is still important. I don't see your patch in CVS yet, so I haven't played with it. But just from inspection, it looks like it does not cover these related issues, which are both required by POSIX to output 0: $ zsh -c 'false; . /dev/null; echo $?' 1 $ zsh -c 'false; ``; echo $?' 1 -- Eric Blake