From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20040922 Description of problem: \B fails when preceding "--" in a grep extended-regexp echo "--ghost" | grep -E -- '\B--ghost\b' should output "--ghost" and have return status of '0' Version-Release number of selected component (if applicable): grep-2.5.1-31.4 How reproducible: Always Steps to Reproduce: 1. echo "--ghost" | grep -E -- '\B--ghost\b' Actual Results: nothing output return status ($?) is 1 Expected Results: "--ghost" should have been output return status ($?) should be 0 Additional info: Version of grep supplied on FC3 installation CD (grep-2.5.1-31) works as expected, but the current FC3 update (grep-2.5.1-31.4) doesn't. The bug is also present in the version supplied in FC4 test 2/3.91 (grep-2.5.1-48). Downloading grep-2.5.1a.tar.gz from a gnu mirror and compiling from source produces a grep that works properly (compiled on FC3). This bug causes knock-on problems in autofs: the --ghost option, if present in /etc/auto.master, is not passed on by the startup script (/etc/init.d/autofs) to the automount processes it starts up. This functionality I think has only been supported from FC3 onwards, but the grep update has broken it... The following lines in the autofs startup script (/etc/init.d/autofs) use grep to check for --ghost and so when the buggy versions of grep fail to detect it (when it is there) then there won't be ghost/browsable entries under automount mount-points. if echo "$DAEMONOPTIONS $options" | grep -qE -- '\B-(g\b|-ghost\b)' ; then startupoptions="$startupoptions --ghost" fi and an example entry in /etc/auto.master is: /phys /etc/auto.phys --ghost
Works for me in both en_GB.UTF-8 and C locales.