From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-1.1 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 23164 invoked from network); 30 Sep 2021 11:42:34 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 30 Sep 2021 11:42:34 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 992179CB11; Thu, 30 Sep 2021 21:42:30 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 7340C9CAE5; Thu, 30 Sep 2021 21:41:55 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=pass (2048-bit key; unprotected) header.d=dartmouth.edu header.i=@dartmouth.edu header.b="F/C3rMVA"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id EC9029CAE4; Thu, 30 Sep 2021 21:41:51 +1000 (AEST) Received: from mail-wr1-f41.google.com (mail-wr1-f41.google.com [209.85.221.41]) by minnie.tuhs.org (Postfix) with ESMTPS id C0E219CAE3 for ; Thu, 30 Sep 2021 21:41:50 +1000 (AEST) Received: by mail-wr1-f41.google.com with SMTP id m22so4093336wrb.0 for ; Thu, 30 Sep 2021 04:41:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dartmouth.edu; s=google1; h=mime-version:from:date:message-id:subject:to; bh=EiMSqOKF1/OrD4V50l5RjaYLy/4PIs2mlwyApbSvl7U=; b=F/C3rMVArj4bLD+WrYleHjdwi498kv0kjdO0uTglrXzKLCBOYFejvmW800rolVQFBM Wk+PvmF6YVhYtMD+UiDeA0D6K/Fo9XCPYgK7GR1GR2QxptyOEBAkM03USjwWrDI4o0Nu ibzZonSA18nUcjs/pHAdSIyiMt9u8NosqfLcKGXf7w66w89M+/lgKRx3crXxvyhPsdMO UdDSHWACw0KSEOIDi4hklb0L2+4xmi0gECjc8ep6+oyP5KY9fCIaAns69/OdIw8L6oQT VFu278iYaU0FjsaFLI62goOjOBSUEFKfobMOPsq6xCyfWMGGbyy4iWYSl8Y2edpzbNVv Qn4A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=EiMSqOKF1/OrD4V50l5RjaYLy/4PIs2mlwyApbSvl7U=; b=nKPMVlejcZJjkzkdK8lzWlQ8VgjmPnkuCE6eyACVyaAJdbVE1E7KKzC9Rmw04Nl47U 9eFSKthWkQd5W1iv02+OZrorR5Qz7yJT7XhBmA6uoScSHPlTwgRSttA8SnzXcMdtipdW xyaPiQ/nFFL5qIuRd2OwSA+qRedcNInCftvwmf8IKt5/l0H8282IL+dceqJJT42fYii5 hfL7qfRNYm5GtWiIfoSeO+dxDE7QzjDdHKhbVIxidSrQwj9WTCNbVAq6YKSTN3kd67G3 ilDLnQrv1UogBRcmC5d/NG6vVMX+yusaMy1aHoOA9C4A0QlcKKGy88/p6YzZp8skzGcw LdWA== X-Gm-Message-State: AOAM533hhm5YBfWsPJa30Iwjs+y3OPPg5AwA4jG/fmG2W8uVOa2pKzoo 54RCv57Y3LPXuz9Twxx3FlEzU3vCswyq1+7RA32YE4pU9N266w== X-Google-Smtp-Source: ABdhPJzsD6346/sEIKsEe/C3cVaJ7DT0Y1Fr7wZY6kITCGtIL2or7rOkrIZsIUU2mzAxK0mMV02LFyeIRyCuItDkm4U= X-Received: by 2002:a5d:6d8e:: with SMTP id l14mr5526717wrs.270.1633002108994; Thu, 30 Sep 2021 04:41:48 -0700 (PDT) MIME-Version: 1.0 From: Douglas McIlroy Date: Thu, 30 Sep 2021 07:41:33 -0400 Message-ID: To: TUHS main list Content-Type: text/plain; charset="UTF-8" Subject: Re: [TUHS] Systematic approach to command-line interfaces 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" > one other thing that SLS breaks, for data files, is the whole Unix 'pipe' > abstraction, which is at the heart of the whole Unix tools paradigm. Multics had an IO system with an inherent notion of redirectable data streams. Pipes could have--and eventually did (circa 1987)--fit into that framework. I presume a pipe DIM (device interface manager) was not hard to build once it was proposed and accepted. Doug