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_INVALID,DKIM_SIGNED, MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 26944 invoked from network); 15 Nov 2021 17:01:01 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 15 Nov 2021 17:01:01 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id BA3799C66A; Tue, 16 Nov 2021 03:00:57 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 7677D9C204; Tue, 16 Nov 2021 03:00:29 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=fail reason="signature verification failed" (1024-bit key; secure) header.d=alchemistowl.org header.i=@alchemistowl.org header.b="AwbDhDrY"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 8FF9E9C1E1; Tue, 16 Nov 2021 03:00:11 +1000 (AEST) X-Greylist: delayed 2035 seconds by postgrey-1.36 at minnie.tuhs.org; Tue, 16 Nov 2021 03:00:09 AEST Received: from bagheera.alchemistowl.org (bagheera.alchemistowl.org [213.144.142.21]) by minnie.tuhs.org (Postfix) with ESMTPS id 698839BCFF; Tue, 16 Nov 2021 03:00:09 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alchemistowl.org; h=x-mailer:references:message-id:content-transfer-encoding:date :date:in-reply-to:from:from:subject:subject:mime-version :content-type:content-type; s=a-b; t=1636993568; bh=wpQOF5S/IjKE PBw+rS0T6dRi/RuJR5FOEMm6xCobfmA=; b=AwbDhDrY4Z34Yt50TV7qc1IaUKzE /U8cJS7RViFyMrN76g/aVj+OQltjvIzlvQukJ4VGheZudPBMnC4ObEo8/5nNRv4G VvOgQg8SSNRt6ty8UwBl8AhbQXZLjLmtkIaecPD/9d7vLeOwZjU3LAVE8UUHD3+A GDoVLbSwXlNa7Bs= X-Virus-Scanned: amavisd-new at bagheera.alchemistowl.org Received: from smtpclient.apple (umbra.darkpackets.org [IPv6:2001:1620:ad1:10:0:0:0:105]) (authenticated bits=0) by bagheera.alchemistowl.org (8.16.1/8.16.1) with ESMTPSA id 1AFGQ8Jk088057 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Mon, 15 Nov 2021 16:26:08 GMT Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.120.0.1.13\)) In-Reply-To: Date: Mon, 15 Nov 2021 17:26:03 +0100 Content-Transfer-Encoding: quoted-printable Message-Id: <6882B4A4-EE01-4189-B7E0-2E9BF5383272@alchemistowl.org> References: To: Grant Taylor X-Mailer: Apple Mail (2.3654.120.0.1.13) Subject: Re: [TUHS] [COFF] Will someone please explain the history and usage of gpasswd / newgrp / sg? 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: , From: Arrigo Triulzi via TUHS Reply-To: Arrigo Triulzi Cc: The Unix Heritage Society , COFF Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" On 15 Nov 2021, at 17:11, Grant Taylor via COFF = wrote: > I've run across them again recently while reading old Unix texts. = I've been aware of them for years, but I've never actually used them for = anything beyond kicking the tires. So I figured that I'd inquire of the = hive mind that is TUHS / COFF. The only time I ever used it was back in the early =E2=80=9890s when on = a SunOS system (dirac, for friends) it was used to allow graduate = students access to the grading database (i.e. a text file) which was = within a directory normally only accessible to teaching staff. The = directory was group writable to a special =E2=80=9Cmarking group=E2=80=9D = to which the various graduate students were added each term. We=E2=80=99d "newgrp grades=E2=80=9D and type the password we had been = given to be able to edit the file and add the grades for the assessments = we had marked (for food money). I eventually became root on the machine and found my =E2=80=9Csu -=E2=80=9C= screen to be a faster solution to accessing the file (sorry Franco, = should you ever read this). Cheers, Arrigo=20