I can't identify when it was fixed, but can confirm this is not happening any more in grep 3.1-2build1 in Ubuntu 18.04.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to grep in Ubuntu. https://bugs.launchpad.net/bugs/1769941 Title: grep fails to match an empty line using perl regexp if it's the last line in a file Status in grep package in Ubuntu: New Bug description: 1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu Description: Ubuntu 16.04.4 LTS Release: 16.04 2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center grep: Installed: 2.25-1~16.04.1 Candidate: 2.25-1~16.04.1 Version table: *** 2.25-1~16.04.1 500 500 http://ru.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages 100 /var/lib/dpkg/status 2.24-1 500 500 http://ru.archive.ubuntu.com/ubuntu xenial/main amd64 Packages 3) What you expected to happen (echo 123; echo; ) | grep -P '^$' $ # output contains one empty line $ (echo 123; echo;) | grep -P '^$' $ 4) What happened instead $ # output contains no line $ (echo 123; echo;) | grep -P '^$' $ ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: grep 2.25-1~16.04.1 ProcVersionSignature: Ubuntu 4.13.0-38.43~16.04.1-generic 4.13.16 Uname: Linux 4.13.0-38-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.16 Architecture: amd64 CurrentDesktop: Unity Date: Tue May 8 18:49:45 2018 InstallationDate: Installed on 2018-02-13 (83 days ago) InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801) SourcePackage: grep UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grep/+bug/1769941/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
