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 D911C2FFE1 for ; Thu, 5 Dec 2024 19:05:55 +0100 (CET) Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 013EC43E26; Fri, 6 Dec 2024 04:05:51 +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 390F343E25 for ; Fri, 6 Dec 2024 04:05:44 +1000 (AEST) Received: (qmail 8253 invoked from network); 5 Dec 2024 18:05:43 -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:content-transfer-encoding:cleverness; s=203b6751eb77.k2412; t=1733421933; x=1733767533; bh=/xM401bkvAq4j+tL/JnohO/lvzeJ7roWCFRX3eX2MR8=; b=c5zVT0vKPhsanluZiX71C8YU5eq0DZOulYFwCE53cN8FOAqejZyYYn030MMzQFivC8KCEtbtorTx93iBc3EzRotmWrarzF0aZsY7KTWrguOHMLVqbP65PLXoYLcWG2sSIaVmrGyYKM7yHS4LW25aCnJY9HEV0dIoW0aEKpsh/W2jC7QTKlCNU1QZ+M+3zgCoNsHV++KHZ6Ku1YE88RJpToP7Plob/40ptT6UIpJt+J41s231E15n6WI8i2rUJpO8byE5nguzVN8sC7gsd1J+x/mhhbAslnLJTToNSzndGDw7eSsQQh6h/PV/wUlfY7ajqPKmYDXKsURg9lPBLqk+rg== 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:content-transfer-encoding:cleverness; s=203b6751eb77.k2412; bh=/xM401bkvAq4j+tL/JnohO/lvzeJ7roWCFRX3eX2MR8=; b=AmO7uxVb6NFoBAimL6utghWaSNhIvEbdUWtpa7Zc7N1Iue/2U+yAhk2ZfqzwbZDK1xoSqyZjMAdJLiHggRJo+N+xzahN9XyIGifsE0pHIkmyOogJmmKUbFp9SHKgW5SrPanVXgGnpDeScONGnAxsd2q5KKb107q/eZiHVgY8eVL4ogFbmXcPEMMLFnx1e1Jx3v+BNLwIWc+hfZ0bJ++SCJ8SeQDiu/otpu74SZjg0AacqLjvZpjDXKV56CDs2R1+/cGZvsnzyzjK7HaqK/OjatydMCdnf7TsYoll0jGSQCc5/+NpdlzT84NA7VGu1zjBPKRpAoNWkasU+ZNc5IspnA== 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 18:05:42 -0000 Received: by ary.qy (Postfix, from userid 501) id E2818AB56024; Thu, 5 Dec 2024 13:05:41 -0500 (EST) Date: 5 Dec 2024 13:05:41 -0500 Message-Id: <20241205180541.E2818AB56024@ary.qy> From: "John Levine" To: tuhs@tuhs.org In-Reply-To: Organization: Taughannock Networks References: <568FD44F-01FB-441B-846B-7D42C3A8E1FB@canb.auug.org.au> <20241205030843.8552FAB1EDA5@ary.qy> <32bf4263-277d-8c8b-6bf7-e33df04a2c3c@taugh.com> X-Headerized: yes Cleverness: minimal Mime-Version: 1.0 Content-type: text/plain; charset=utf-8 Content-transfer-encoding: 8bit Message-ID-Hash: JD5CAOHFZEM54R2BF7NT7Q6FGBONYCXS X-Message-ID-Hash: JD5CAOHFZEM54R2BF7NT7Q6FGBONYCXS X-MailFrom: johnl@iecc.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: mrochkind@gmail.com 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: It appears that Marc Rochkind said: >-=-=-=-=-=- >-=-=-=-=-=- > >I don't think files as pipes would be "transparent to the user." Reading an >empty pipe causes a wait until the bytes requested are available, unless >the pipe is closed first. ... You should read Meinz' paper. This was a cut down version of Unix that ran in 40K bytes on an LSI-11 with a couple of floppy disks. It ran one program at a time, since swapping to floppies was absurdly slow. The pseudo-pipe ran the first program which wrote the output to a file, then ran the second program which read it. It was close enough for most purposes so long as the disk didn't fill up. >Still, the same sort of pseudo-pipes were in MS-DOS, and they were >occasionally useful. I can think of lots of places that had a way for one program to write a temporary file that a subsequent one read. For example, in OS/360 JCL you'd write (well, punch) something like this for the object output of the Fortran compiler //SYSLIN DD DSNAME=&OBJECT,DISP=(NEW,PASS),UNIT=SYSSQ and then in the linker read it in //SYSIN DD DSNAME=&OBJECT,DISP=(OLD,DELETE) The & in the name said it was a temp file so make up a unique name. I probably didn't get the JCL exactly right since it's been about 50 years since I wrote any. R's, John