Date: Wed, 27 Sep 2017 18:35:17 +0000 From: betty.nelson@protechnologyaccounts.net To: freebsd-questions@freebsd.org Subject: Cisco Users Email List and Mailing Addresses Message-ID: <001a1136f782a74286055a300d6b@google.com>
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by mailman.ysv.freebsd.org (Postfix) with ESMTP id B2F77E0E048 for <freebsd-questions@mailman.ysv.freebsd.org>; Wed, 27 Sep 2017 19:58:40 +0000 (UTC) (envelope-from list@museum.rain.com) Received: from g5.umpquanet.com (g5.umpquanet.com [98.158.10.79]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "g5.umpquanet.com", Issuer "Let's Encrypt Authority X3" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 9615384CBE for <freebsd-questions@freebsd.org>; Wed, 27 Sep 2017 19:58:39 +0000 (UTC) (envelope-from list@museum.rain.com) Received: from g5.umpquanet.com (localhost [127.0.0.1]) by g5.umpquanet.com (8.15.2/8.15.2) with ESMTPS id v8RJwTV0077689 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for <freebsd-questions@freebsd.org>; Wed, 27 Sep 2017 12:58:29 -0700 (PDT) (envelope-from list@museum.rain.com) Received: (from james@localhost) by g5.umpquanet.com (8.15.2/8.15.2/Submit) id v8RJwS2W077688 for freebsd-questions@freebsd.org; Wed, 27 Sep 2017 12:58:28 -0700 (PDT) (envelope-from list@museum.rain.com) X-Authentication-Warning: g5.umpquanet.com: james set sender to list@museum.rain.com using -f Date: Wed, 27 Sep 2017 12:58:28 -0700 From: list@museum.rain.com To: freebsd-questions@freebsd.org Subject: Possible bug in tail(1) Message-ID: <20170927195828.GA77592@g5.umpquanet.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.8.3 (2017-05-23) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: User questions <freebsd-questions.freebsd.org> List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-questions>, <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions/>; List-Post: <mailto:freebsd-questions@freebsd.org> List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help> List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-questions>, <mailto:freebsd-questions-request@freebsd.org?subject=subscribe> X-List-Received-Date: Wed, 27 Sep 2017 19:58:40 -0000 Is it reasonable to expect that tail -r is reversable? That is, should: tail -r foo | tail -r produce the same output as: cat foo for all text files foo? The script below creates a file foo for which the above does not hold. This seems to be a somewhat recent bug. This vintage of 10.2 passes, as do all ancient versions I can lay hands on (4.8, 9.3): FreeBSD hostname.example.org 10.2-STABLE FreeBSD 10.2-STABLE #1 r290210: Fri Oct 30 16:36:14 PDT 2015 root@hostname.example.org:/usr/obj/usr/src/sys/GENERIC amd64 This 10.3 fails: FreeBSD hostname.example.org 10.3-STABLE FreeBSD 10.3-STABLE #0 r318965: Fri May 26 13:47:47 PDT 2017 root@hostname.example.org:/usr/obj/usr/src/sys/GENERIC amd64 This 11.1 also fails: FreeBSD hostname.example.org 11.1-STABLE FreeBSD 11.1-STABLE #0 r321596: Wed Jul 26 18:21:47 PDT 2017 root@hostname.example.org:/usr/obj/usr/src/sys/GENERIC amd64 Thank you for looking into this. Apologies in advance for any unreasonable expectations on my part. Regards, Jim #!/usr/bin/env bash cat << EOF > foo 1 2 3 EOF echo "--" cat foo echo "--" tail -r foo echo "--" tail -r foo | tail -r echo "--"
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