From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 2162 invoked by alias); 7 Mar 2011 09:26:49 -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: 15838 Received: (qmail 21634 invoked from network); 7 Mar 2011 09:26:38 -0000 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on f.primenet.com.au X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received-SPF: none (ns1.primenet.com.au: domain at closedmail.com does not designate permitted sender hosts) From: Bart Schaefer Message-id: <110307012625.ZM9254@torch.brasslantern.com> Date: Mon, 07 Mar 2011 01:26:25 -0800 In-reply-to: Comments: In reply to Lyre <4179e1@gmail.com> "string equal problem" (Mar 7, 5:04pm) References: X-Mailer: OpenZMail Classic (0.9.2 24April2005) To: Lyre <4179e1@gmail.com>, zsh-users@zsh.org Subject: Re: string equal problem MIME-version: 1.0 Content-type: text/plain; charset=us-ascii On Mar 7, 5:04pm, Lyre wrote: } Subject: string equal problem } } if [ "abc" == "def" ]; then echo y; else echo n; fi } } doesn't work, it says "zsh: = not found". 14.7.3 `=' expansion -------------------- If a word begins with an unquoted `=' and the EQUALS option is set, the remainder of the word is taken as the name of a command. If a command exists by that name, the word is replaced by the full pathname of the command. What the doc doesn't go on to say is that if a command does NOT exist by that name, it's an error. The "test" command/builtin, for which "[" is an alias, doesn't normally allow "==" as an operator; rather, it uses "=" for this comparison. /usr/bin/test: ==: binary operator expected As it happens, zsh does allow == as an operator for test, but you must either quote it or unsetopt EQUALS, because the arguments of test are subject to filename expansion. If you want to use == without messing with the option, try this way: if [[ "abc" == "def" ]]; then echo y; else echo n; fi The "[[" reserved word imposes different parsing rules on the expression it introduces, so there == is not subject to expansion. } All of them doesn't work, except the zsh 4.2.0 on sles9. SUSE must unsetopt EQUALS in /etc/zshenv, or some other startup file, because no zsh since around version 2 (maybe longer) has been different in this regard.