From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.2 Received: from minnie.tuhs.org (minnie.tuhs.org [45.79.103.53]) by inbox.vuxu.org (OpenSMTPD) with ESMTP id f28c5673 for ; Wed, 4 Mar 2020 06:49:32 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id 6E9A79D724; Wed, 4 Mar 2020 16:49:30 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id E6D089D71B; Wed, 4 Mar 2020 16:49:18 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 6E2839D71B; Wed, 4 Mar 2020 16:49:16 +1000 (AEST) Received: from freefriends.org (freefriends.org [96.88.95.60]) by minnie.tuhs.org (Postfix) with ESMTPS id 489499D68F for ; Wed, 4 Mar 2020 16:49:15 +1000 (AEST) X-Envelope-From: arnold@skeeve.com Received: from freefriends.org (freefriends.org [96.88.95.60]) by freefriends.org (8.14.7/8.14.7) with ESMTP id 0246mt2t029359 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 3 Mar 2020 23:48:56 -0700 Received: (from arnold@localhost) by freefriends.org (8.14.7/8.14.7/Submit) id 0246mteF029358; Tue, 3 Mar 2020 23:48:55 -0700 From: arnold@skeeve.com Message-Id: <202003040648.0246mteF029358@freefriends.org> X-Authentication-Warning: frenzy.freefriends.org: arnold set sender to arnold@skeeve.com using -f Date: Tue, 03 Mar 2020 23:48:55 -0700 To: tuhs@tuhs.org, dave@horsfall.org References: <202003031815.023IFSlD493028@darkstar.fourwinds.com> In-Reply-To: User-Agent: Heirloom mailx 12.5 7/5/10 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Subject: Re: [TUHS] Command line options and complexity X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" Dave Horsfall wrote: > On Wed, 4 Mar 2020, Tyler Adams wrote: > > > > These go all the way back to v7 unix, where ls has an option to > > > reverse the sort order (which could have been done by passing the > > > output to tac). > > > > Good point. Why was this done in v7 unix and why wasn't it thrown out? There was no tac in V7 Unix. It was first posted to USENET, I don't know by who, and picked up by Linux and *BSD. > And speaking of "tac" (which I never saw), I couldn't think of a single > use for "rev" (although no doubt I'll now get told). It's useful for reading Hebrew sent in plain text email :-). Hebrew is read right to left but stored in physical order (left to right) in files. Arnold