From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 6544 invoked from network); 23 Jun 2004 08:58:10 -0000 Received: from thor.dotsrc.org (HELO a.mx.sunsite.dk) (130.225.247.86) by ns1.primenet.com.au with SMTP; 23 Jun 2004 08:58:10 -0000 Received: (qmail 18696 invoked from network); 23 Jun 2004 08:57:35 -0000 Received: from sunsite.dk (130.225.247.90) by a.mx.sunsite.dk with SMTP; 23 Jun 2004 08:57:35 -0000 Received: (qmail 637 invoked by alias); 23 Jun 2004 08:57:12 -0000 Mailing-List: contact zsh-users-help@sunsite.dk; run by ezmlm Precedence: bulk X-No-Archive: yes X-Seq: 7595 Received: (qmail 627 invoked from network); 23 Jun 2004 08:57:11 -0000 Received: from thor.dotsrc.org (HELO a.mx.sunsite.dk) (qmailr@130.225.247.86) by sunsite.dk with SMTP; 23 Jun 2004 08:57:08 -0000 Received: (qmail 17715 invoked from network); 23 Jun 2004 08:57:08 -0000 Received: from lhuumrelay3.lnd.ops.eu.uu.net (62.189.58.19) by a.mx.sunsite.dk with SMTP; 23 Jun 2004 08:57:07 -0000 Received: from MAILSWEEPER01.csr.com (mailhost1.csr.com [62.189.183.235]) by lhuumrelay3.lnd.ops.eu.uu.net (8.11.0/8.11.0) with ESMTP id i5N8uev08255 for ; Wed, 23 Jun 2004 08:56:40 GMT Received: from EXCHANGE02.csr.com (unverified [192.168.137.45]) by MAILSWEEPER01.csr.com (Content Technologies SMTPRS 4.3.12) with ESMTP id for ; Wed, 23 Jun 2004 09:56:01 +0100 Received: from news01.csr.com ([192.168.143.38]) by EXCHANGE02.csr.com with Microsoft SMTPSVC(5.0.2195.6713); Wed, 23 Jun 2004 09:57:00 +0100 Received: from news01.csr.com (localhost.localdomain [127.0.0.1]) by news01.csr.com (8.12.11/8.12.11) with ESMTP id i5N8uckY002913 for ; Wed, 23 Jun 2004 09:56:38 +0100 Received: from csr.com (pws@localhost) by news01.csr.com (8.12.11/8.12.11/Submit) with ESMTP id i5N8ucoF002908 for ; Wed, 23 Jun 2004 09:56:38 +0100 Message-Id: <200406230856.i5N8ucoF002908@news01.csr.com> X-Authentication-Warning: news01.csr.com: pws owned process doing -bs To: zsh-users@sunsite.dk Subject: Re: How to clean up path most efficiently? In-reply-to: "Timothy Luoma"'s message of "Tue, 22 Jun 2004 15:46:33 EDT." Date: Wed, 23 Jun 2004 09:56:38 +0100 From: Peter Stephenson X-OriginalArrivalTime: 23 Jun 2004 08:57:00.0054 (UTC) FILETIME=[0B789360:01C45900] X-Spam-Checker-Version: SpamAssassin 2.63 on a.mx.sunsite.dk X-Spam-Level: ** X-Spam-Status: No, hits=2.3 required=6.0 tests=BAYES_70 autolearn=no version=2.63 X-Spam-Hits: 2.3 Timothy Luoma wrote: > > It should be as simple as: > > > > path=($^path(N)) > > Does that go through the current $PATH and delete all the folders that > aren't listed in there? I should probably have explained in more detail at the time. The ^ indicates that anything outside the array should be expanded with each element, so the expression becomes something like: path=(/usr/local/bin(N) //usr/nonexistent/bin(N) /usr/bin(N) /bin(N)) The presence of the glob qualifier (N) turns on globbing even though there are no patterns present (historically, it didn't always do that). The shell then goes through it turning any name which doesn't exist in the filesystem into a null string, and passing the rest through, so it becomes something like: path=(/usr/local/bin /usr/bin bin) which then gets assigned back to path. This automatically appears in PATH as PATH=/usr/local/bin:/usr/bin:/bin -- Peter Stephenson Software Engineer CSR Ltd., Science Park, Milton Road, Cambridge, CB4 0WH, UK Tel: +44 (0)1223 692070 ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com **********************************************************************