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_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 DA16B304B5 for ; Fri, 6 Dec 2024 01:46:55 +0100 (CET) Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 18B684274F; Fri, 6 Dec 2024 10:46:50 +1000 (AEST) Received: from mail-pg1-x52a.google.com (mail-pg1-x52a.google.com [IPv6:2607:f8b0:4864:20::52a]) by minnie.tuhs.org (Postfix) with ESMTPS id 6B01A4274A for ; Fri, 6 Dec 2024 10:46:47 +1000 (AEST) Received: by mail-pg1-x52a.google.com with SMTP id 41be03b00d2f7-7f46d5d1ad5so1309259a12.3 for ; Thu, 05 Dec 2024 16:46:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1733446006; x=1734050806; darn=tuhs.org; h=content-transfer-encoding:mime-version:message-id:date:user-agent :references:in-reply-to:subject:to:from:from:to:cc:subject:date :message-id:reply-to; bh=50UjEQeTdMPMqJYvtB9b+uUlfH7140f4Hnw6Cd27k5w=; b=J8zzM2dqkS5bSus2/ps4heOT+44RiewdAtmRfrIcO56A7cG/iGwdfgOrclDkw74E15 nIN4aRUtfknXEPgQcUv96vpiCmaX3xOKG1VFMpWQOEtvix9uy22CHP71GgzPaiInZuGE aZmRfb9uWopnoQqSwL2p22p79kaLgCxjHO1Tme7MrR0rY42Q1FqSd2AWz09Hz+iCEh6o 5ZVJ57ZtaW5NcgbAtZZn3cWLsRPgpvEFzVHRtTehDtaNRPw2sB7w3ts62AzkGpOl9tKB nwBEFPK1bbIEXRzIntOlY2nnMg/8MmVlJey/k04yGSLk3uXcF3KYqdSvk2rzB+YcaK2D WjOg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1733446006; x=1734050806; h=content-transfer-encoding:mime-version:message-id:date:user-agent :references:in-reply-to:subject:to:from:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=50UjEQeTdMPMqJYvtB9b+uUlfH7140f4Hnw6Cd27k5w=; b=mC/lRoXZM9tbxWbbpxBeMopG3b3MTzyhx1ttER6L0qH6WCJ4o+RV6ucqP6VIFsi+N9 ck1/ngikdwk267IjE8+GEvkHVQ7uPt9Zr9AYRSwzU6ShaRwli9nFQsvbEciddaFsxuT2 gKqA0HjpA1GkCqM/6VYnaq0tjEnXhlD3Ik6GtF0jyEqkjOiORfXWbXVypcWejTQuos+m L1TpBB3+ZZCOPbyF32U0QggmWlFDlStMevjJkRVOD6WDzAIUaEDLn527Ry7byXbHjhNB ZvD4FO2bYqaTBtApf1DjHDYuM+pg/G6Uc6IFI9IqO+rqpNHtpHh8TFGVD9+DOAOcZuYl RrBA== X-Gm-Message-State: AOJu0Ywe5OYzvyJ2okk+a5RYKg0e/xZRO/bBmdCE3UQE59HZ1JEmMsUY 6yPeSLGhIXQGswiRXhHv+4UaVn/xBBpYLq2i76JLsjtyze1324CEumYD8A== X-Gm-Gg: ASbGncs9DuuE64K82IEZWIXHW1I07sN6FlJ4Q53zk5mUAdNeiqYIOGdxtNL0ixWwzdn GFcpnRZsMntduTLPJLEnaJ8AmJYqWJsCGGN12NV4AemDED6zf+PnlLsg0NQdoj2U4/3bS4JwR03 bq2BUfRukSNglQU5Gi/qE95xTgXIpIr3I8tbqMeT4gBdUuCtdrpkfOy3ePL3hKko0docLSCwYKn /W9GKjfjgDYTi/Eiv1T0TZ/T5cKoU/gfypnSlmhyra5ccsD X-Google-Smtp-Source: AGHT+IGdQMlWlyAwKYxrSa/C7I0MQugftityAPwGrdUVct+meUavM77RuaCXvrNVef5Wcv6YJQbBhw== X-Received: by 2002:a05:6a21:32a9:b0:1db:efab:390c with SMTP id adf61e73a8af0-1e18712272bmr1772376637.35.1733446006600; Thu, 05 Dec 2024 16:46:46 -0800 (PST) Received: from localhost ([120.19.163.244]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-725a2cc6c14sm1914658b3a.189.2024.12.05.16.46.45 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Dec 2024 16:46:46 -0800 (PST) From: Alexis To: The Unix Heritage Society In-Reply-To: <002cf6d3-0ed2-46f2-9fae-19a3e10d7b9c@case.edu> (Chet Ramey via TUHS's message of "Thu, 5 Dec 2024 14:19:43 -0800") References: <568FD44F-01FB-441B-846B-7D42C3A8E1FB@canb.auug.org.au> <20241205030843.8552FAB1EDA5@ary.qy> <2fd6a361-b26f-4ca4-9c65-b6ba0559644e@case.edu> <202412052055.4B5KtYf1781856@freefriends.org> <002cf6d3-0ed2-46f2-9fae-19a3e10d7b9c@case.edu> User-Agent: mu4e 1.12.7; emacs 29.4 Date: Fri, 06 Dec 2024 11:46:43 +1100 Message-ID: <87ttbhzlho.fsf@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Message-ID-Hash: BEVKRJVIVARUHVGG7JJFZW2EXFA3FRAR X-Message-ID-Hash: BEVKRJVIVARUHVGG7JJFZW2EXFA3FRAR X-MailFrom: flexibeast@gmail.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 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: Chet Ramey via TUHS writes: > On 12/5/24 5:03 PM, Warner Losh wrote: > >> The <() , >()=C2=A0 syntax is a bash extension. Not all shells=20 >> support >> it. And >> I couldn't find them in POSIX Issue 8. > > Credit where credit is due: I picked them up from ksh93, and=20 > extended > them to use named pipes on systems where /dev/fd isn't=20 > available. i must say i was moderately surprised to learn a few years ago=20 that process substitution wasn't in POSIX - i find it succinct=20 syntactic sugar. There's a post on Chris Siebenmann's blog about=20 some of the issues involved, including the /dev/fd issue: https://utcc.utoronto.ca/~cks/space/blog/unix/ProcessSubstitutionWhyLate Can anyone point me to any discussions about process substitution=20 potentially becoming part of POSIX? This search on the Austin=20 Group tracker didn't yield any useful results: https://austingroupbugs.net/search.php?project_id=3D0&search=3Dprocess+subs= titution&sticky_issues=3Doff&sortby=3Dlast_updated&dir=3DDESC&hide_status_i= d=3D-2&FILTER_SEARCH_PLATFORM=3D Alexis.