From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 21069 invoked by alias); 2 Apr 2012 10:33:18 -0000 Mailing-List: contact zsh-users-help@zsh.org; run by ezmlm Precedence: bulk X-No-Archive: yes List-Id: Zsh Users List List-Post: List-Help: X-Seq: 16948 Received: (qmail 26568 invoked from network); 2 Apr 2012 10:33:16 -0000 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on f.primenet.com.au X-Spam-Level: X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_LOW, SPF_HELO_PASS autolearn=ham version=3.3.2 Received-SPF: none (ns1.primenet.com.au: domain at csr.com does not designate permitted sender hosts) Date: Mon, 2 Apr 2012 11:33:07 +0100 From: Peter Stephenson To: Subject: Re: `cd .` in non-existent directory leads into weird corner case Message-ID: <20120402113307.15ec97d2@pwslap01u.europe.root.pri> In-Reply-To: References: <120327073414.ZM6783@torch.brasslantern.com> Organization: Cambridge Silicon Radio X-Mailer: Claws Mail 3.7.9 (GTK+ 2.22.0; i386-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.101.10.170] X-Scanned-By: MailControl 7.7.0 (www.mailcontrol.com) on 10.71.0.142 On Mon, 2 Apr 2012 12:15:59 +0200 Mikael Magnusson wrote: > Weird, when I try making a directory and remove it, I can still cd .. > to the parent... That's not weird; the shell remembers PWD because by default it changes directory logically rather than physically, i.e. retaining symbolic links in the path, so it changes to the parent directory by what amounts to 'cd $PWD:h'. What you get with CHASE_LINKS or cd -P is another matter, since the ability to take account of symbolic links means the whole logic is rather baroque, but I'd vaguely expect it either to fail or fail to resolve the physical directory and default to trimming PWD. (What it does and what it should do are again not necessarily identical.) -- Peter Stephenson Software Engineer Tel: +44 (0)1223 692070 Cambridge Silicon Radio Limited Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, UK Member of the CSR plc group of companies. CSR plc registered in England and Wales, registered number 4187346, registered office Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, United Kingdom More information can be found at www.csr.com. Follow CSR on Twitter at http://twitter.com/CSR_PLC and read our blog at www.csr.com/blog