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=-0.8 required=5.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FROM,MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 10045 invoked from network); 4 Jan 2023 03:33:26 -0000 Received: from minnie.tuhs.org (50.116.15.146) by inbox.vuxu.org with ESMTPUTF8; 4 Jan 2023 03:33:26 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 7A6D042547; Wed, 4 Jan 2023 13:32:51 +1000 (AEST) Received: from mail-lf1-f44.google.com (mail-lf1-f44.google.com [209.85.167.44]) by minnie.tuhs.org (Postfix) with ESMTPS id 745C842538 for ; Wed, 4 Jan 2023 13:32:44 +1000 (AEST) Received: by mail-lf1-f44.google.com with SMTP id 1so48637218lfz.4 for ; Tue, 03 Jan 2023 19:32:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=JHBmi6LOzt+8xXAv+IfLcxvWCbIHUg6r2Aej7B1ONHc=; b=jx8KtdbACacHx73Mbt3jTCEQ3IJDlwmLmmWOp163Isd/I0HwtIqM7QWac9Alxu+aoQ gcgehcAtCawSX0ArnblWDiHPJxjFtln4HgYuVslJDlrSqDS6vVuHdVto+eQUzh57QD1Y CDOFW4w7CWnlxyHbBQS3Z/Pm+nvzwxFCC/b/Hoq9AXFvwzF4MviU6QG0z0At+UmBkyhz mfg09dlPc93i2T1rNe3XxIc0VFFF0Pz2XgFWTWrZG4dmWWU9/pmBEw8GClLoORBN6Q+w 8hlbHDS7rALc3Ij88eKDfiKnuobcl750/Q4jA7pKtlrRhnjHYBbUR/UkTlnyoeSXaeA/ 56NA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=JHBmi6LOzt+8xXAv+IfLcxvWCbIHUg6r2Aej7B1ONHc=; b=lAR7h3tPZRBHGp7WBmAStfdCCumh+4x+7biTj2VwrzAb5nqlAVhaVyBIBYQ95Y7+JZ 0Hk22DnsKj/WGdOCzCGgWGjixPzDpb+WlNgmO49q38jn6kx+IdMfqEFvvraxnTkqudQY Uw3pT2dJHAsGWonuRwNMiQNtHrspg009uFy+rJUPNHNfL2eC61hMx5Ihu+DDMtY873eZ R8zh2+K5ABqUtp7ANwK8HQaHBflqXp652SjR3kXm9s425KfxmUE4nRfEbGzDnVttcS62 tvrA0NtI48kZ/ct0en2TFcWfwVjVwLZvQiCMIEipmAjktUeBJ++Rm3tN8mAFv+OsmIEx YqZw== X-Gm-Message-State: AFqh2kqVIL5DFfjPXqtX7MEgrPfYWeQKoGvcdwrtXFcIGxJKUtn6etD4 jlaM/g6959gn0bwoaw6466Nscyi+CAJaJfWjslXoOTbN X-Google-Smtp-Source: AMrXdXuaauAOASbD6YrFAO9GzHi9bmD/4ubCBCsINbgVSpegrNe83Y8BD08+Gh4rXkQkd4di7yWXdYJ7h9ARo2fi0Jg= X-Received: by 2002:ac2:4c3b:0:b0:4cb:6c5:89a2 with SMTP id u27-20020ac24c3b000000b004cb06c589a2mr1320346lfq.411.1672803102684; Tue, 03 Jan 2023 19:31:42 -0800 (PST) MIME-Version: 1.0 References: <52FB6638-AEFF-4A4F-8C2E-32089D577BA0@planet.nl> <464819f0-d2f6-2a60-6481-a194f4428b4d@case.edu> <20221230200246.GW5825@mcvoy.com> <88f83b4c-b3f9-ed87-b2fa-560fb369742a@makerlisp.com> <20221231035931.GG5825@mcvoy.com> <528f0c53-ccc2-88a1-5a7b-120362c648dd@mhorton.net> <20230102165120.GK25547@mcvoy.com> <20230102174304.GM25547@mcvoy.com> In-Reply-To: From: Dan Cross Date: Tue, 3 Jan 2023 22:31:06 -0500 Message-ID: To: John Cowan Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Message-ID-Hash: MEHEFBVQHBRGX4YO6RC54IDYAQ3X2VSJ X-Message-ID-Hash: MEHEFBVQHBRGX4YO6RC54IDYAQ3X2VSJ X-MailFrom: crossd@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 CC: The Eunuchs Hysterical Society X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [TUHS] Re: A few comments on porting the Bourne shell List-Id: The Unix Heritage Society mailing list Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Tue, Jan 3, 2023 at 10:22 PM John Cowan wrote: > Making shell scripts portable means not using pipelines, because given "f= oo | bar", kshNN and zsh execute foo in a subshell and bar in the top-level= shell, whereas in other shells, both foo and bar execute in subshells. (F= or this reason, Posix allows either behavior.) Not having pipelines is a p= retty drastic limitation. This came up at work just the other day: echo ' hi ' | sed 's/^ *//;s/ *$//' | read bummer echo $bummer The behavior varies between ksh, zsh, bash, sh. Yay. - Dan C.