Date: Thu, 28 Sep 2017 22:51:35 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 222671] tail(1): tail -r fails on certain piped input Message-ID: <bug-222671-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222671 Bug ID: 222671 Summary: tail(1): tail -r fails on certain piped input Product: Base System Version: 11.1-STABLE Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: bin Assignee: freebsd-bugs@FreeBSD.org Reporter: freebsd-bugzilla@umpquanet.com I'm not 100% sure of the conditions, but it appears that when: 1) tail -r is reading from a pipe; 2) the first input on the pipe is a newline (first line is blank) tail will reverse the output, except it gets the Nth and (N-1)th output lines wrong. It places the first line of input (the newline) on the (N-1)th line of output, and it place the second line of input on the Nth line of output. $ uname -a FreeBSD g5.umpquanet.com 11.1-STABLE FreeBSD 11.1-STABLE #0 r321722: Sun Jul 30 12:07:20 PDT 2017 root@g5.umpquanet.com:/usr/obj/usr/src/sys/G5 amd64 $ printf '\n1\n' 1 $ printf '\n1\n' | tail -r 1 $ printf '\n1\n2\n3\n' 1 2 3 $ printf '\n1\n2\n3\n' | tail -r 3 2 1 $ I looked at the GitHub mirror and downloaded a few src tarballs around recent commits to tail. Building tail from: https://github.com/freebsd/freebsd/tree/97a2ca501c7e9f07a80339a88fbb5a46977ae428 does not manifest the bug. However, tail built from: https://github.com/freebsd/freebsd/tree/2fef72832029bcc228a527dd9c423ba34a7490e9 does. IANAE, but it appears the bug may have crept in during: https://reviews.freebsd.org/D9067 HTH, Jim -- You are receiving this mail because: You are the assignee for the bug.help
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