From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 27468 invoked by alias); 2 Mar 2015 02:36:18 -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: 19943 Received: (qmail 7723 invoked from network); 2 Mar 2015 02:36:15 -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=0.6 required=5.0 tests=BAYES_00,TO_NO_BRKTS_PCNT autolearn=no version=3.3.2 Date: Mon, 2 Mar 2015 03:27:54 +0100 From: Vincent Lefevre To: zsh-users@zsh.org Subject: Re: grammar triviality with '&&' Message-ID: <20150302022754.GA7449@xvii.vinc17.org> Mail-Followup-To: zsh-users@zsh.org References: <54F33934.2070607@eastlink.ca> <13666281425228233@web7o.yandex.ru> <54F345D3.9010204@eastlink.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Mailer-Info: http://www.vinc17.net/mutt/ User-Agent: Mutt/1.5.23-6424-vl-r76280 (2015-02-19) On 2015-03-01 13:49:38 -0500, Lawrence Velázquez wrote: > On Mar 1, 2015, at 12:01 PM, Ray Andrews wrote: > [...] From zshmisc(1): > > A list is a sequence of zero or more sublists, in which each sublist > is terminated by `;', `&', `&|', `&!', or a newline. > > In your second example, `[ -e file1 ]` constitutes a list. However "&& [ -e file2 ]" could constitute a list too. There is currently a parse error, but zsh could have an extension to accept it as being equivalent to: "[[ $? -eq 0 ]] && [ -e file2 ]". Would there be anything wrong with such an extension? Similarly, "|| X" could be regarded as equivalent to "[[ $? -ne 0 ]] || X" by zsh. -- Vincent Lefèvre - Web: 100% accessible validated (X)HTML - Blog: Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)