From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.4 Received: from minnie.tuhs.org (minnie.tuhs.org [IPv6:2600:3c01:e000:146::1]) by inbox.vuxu.org (Postfix) with ESMTP id 171253061B for ; Thu, 5 Dec 2024 17:00:57 +0100 (CET) Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 043BA43DCF; Fri, 6 Dec 2024 02:00:52 +1000 (AEST) Received: from gal.iecc.com (gal.iecc.com [IPv6:2001:470:1f07:1126:0:43:6f73:7461]) by minnie.tuhs.org (Postfix) with ESMTPS id 4959143DCE for ; Fri, 6 Dec 2024 02:00:44 +1000 (AEST) Received: (qmail 76620 invoked from network); 5 Dec 2024 16:00:41 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed; d=iecc.com; h=date:message-id:from:to:cc:subject:in-reply-to:references:mime-version:content-type; s=12b4a6751ce29.k2412; t=1733414431; x=1733760031; bh=JVv9I/Un7DIW6+Srodp/eGsxfONiKUMVpz+OcwGxAaU=; b=bMgMDDFdilb91gwimeQ8Apazgyv5dAT1A92I+2lqj8eczNmkfbs1xD4Rc8eXsdem+/eja/Vkuo6C3UIAa78FrvBU4yE9VVGRvY+ZzookP2oqXwXym3oZamazzoP919lO2pYDzt8xD14y6r+3qzGLiHdJ0bee0R4Y0kq6sVUtFqKm0PfJSnTddOgO333JN6KjvpwJzli6grlDe90cP2f9Qgbpcja50UtmKkNWUXCcj80XRFFxuXw1arH7KcuSEU4Wwv1LJefM0pD6la5iy7/tmzccJAIK/mqQLakAukmbV19WBz1LMIITEXttUTGaViMJT5CiLD0Dx1xHCmQg3bHeNg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed; d=taugh.com; h=date:message-id:from:to:cc:subject:in-reply-to:references:mime-version:content-type; s=12b4a6751ce29.k2412; bh=JVv9I/Un7DIW6+Srodp/eGsxfONiKUMVpz+OcwGxAaU=; b=oF0LT3YrO7AKAbL5Oiey/akrsMmUBuPXs882BXaY8PnnVCF/i0+ttHk4GKYfpOh/Uyy04MM1gI+iSML+WdA9jCwvyF0IP06JX1CXahJtZrR+OEfPKThg0Yw1i5dSdW0Qvj83ceHKdEbjxAMvQjxFnO0hnHQcA1K5gI0HkwGRBUA7jc1fkO7SPdjbw1J288dJWanCA4DO0OAeK0Uv6/Xlca8AUUKslI8DsNYA5a3AOaEnf50w7BtlxE8Z0poxzobhoB3VT1ebZmzMEI5OXlPZ95/DJ5t229kJpGyC2JKROQcYkYjZdsA/kKUus3i5GEaH2sAwXUUyKGYid9SSd/PDMQ== Received: from ary.qy ([IPv6:2001:470:1f07:1126::78:696d:6170]) by imap.iecc.com ([IPv6:2001:470:1f07:1126::78:696d:6170]) with ESMTPS (TLS1.3 ECDHE-RSA CHACHA20-POLY1305 AEAD) via TCP6; 05 Dec 2024 16:00:41 -0000 Received: by ary.qy (Postfix, from userid 501) id E5D12AB5179F; Thu, 5 Dec 2024 11:00:40 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by ary.qy (Postfix) with ESMTP id 69810AB51780; Thu, 5 Dec 2024 11:00:40 -0500 (EST) Date: 5 Dec 2024 11:00:40 -0500 Message-ID: <32bf4263-277d-8c8b-6bf7-e33df04a2c3c@taugh.com> From: "John R Levine" To: "Dan Cross" X-X-Sender: johnl@ary.qy In-Reply-To: References: <568FD44F-01FB-441B-846B-7D42C3A8E1FB@canb.auug.org.au> <20241205030843.8552FAB1EDA5@ary.qy> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Message-ID-Hash: 3SY7F5BCKK7BQDJ2WJJWH2V2H2NZ26LO X-Message-ID-Hash: 3SY7F5BCKK7BQDJ2WJJWH2V2H2NZ26LO X-MailFrom: johnl@taugh.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-tuhs.tuhs.org-0; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: TUHS , Marc Donner X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [TUHS] Re: Pipes (was Re: After 50 years, what has the Impact of Unix been?) List-Id: The Unix Heritage Society mailing list Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Thu, 5 Dec 2024, Dan Cross wrote: >> Pipes were invented at least three times I'm aware of, but what made them >> work so well in Unix is that they looked to the program the same as a file >> so any program could use them for input or output without special arrangements, >> and the shell made it easy to start two programs and pipe them together. > > Once you have coroutines and queues for passing data between them, a > lot of things start to look like pipes. They also can look a lot like temporary files. Someone, probably Heinz, did a shell for the tiny Unix that ran on floppies so this foo | bar actually did this foo > tmpfile ; bar < tmpfile; rm tmpfile to avoid having to swap programs in and out on floppies. The main disadvantage was that the tmpfile could overflow the tiny disks of the time. >> They were invented again at IBM in the 1970s and described in this paper. I wrote >> them a letter, which they published, saying that Unix pipes did the same thing. >> >> https://dl.acm.org/doi/10.1147/sj.174.0383 > > Don't forget CMS pipelines, too! > > Sadly, the Morrison paper cited above is not easily accessible, though If anyone else needs a copy, just ask. Regards, John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY Please consider the environment before reading this e-mail. https://jl.ly