On 2010-08-03 09:57 -0700, Bob McGowan wrote: > On 08/03/2010 05:39 AM, Andre Majorel wrote: > > On 2010-08-03 19:37 +0800, Zhang Weiwu wrote: > >> On 2010???08???03??? 17:53, Andre Majorel wrote: > >>>>> $ printf 'a\nb' | grep -zo a.*b > >>>>> > >>>>> (The above should output something /if/ -z would make egrep > >>>>> not consider \n as string terminator. But it has produced no > >>>>> output) > >>>> > >>> But grep -z does. This would seem to be an undocumented > >>> limitation of -o. > >> > >> No it doesn't. > >> > >> $ printf 'a\nb' | grep -z 'a.*b' > >> $ > > > > You're welcome. What version of grep ? > > The -z "sort of" does/doesn't work for me. If I do this: > > $ perl -e 'print "a\nb\0"'| grep -z 'a.*b' > $
$ printf 'a\nb\0'| grep -z 'a.*b' a b$ grep --version GNU grep 2.5.3 Fun, eh ? Maybe the answer is in there : $ locale LANG= LC_CTYPE=en_US LC_NUMERIC="POSIX" LC_TIME="POSIX" LC_COLLATE=C LC_MONETARY="POSIX" LC_MESSAGES="POSIX" LC_PAPER="POSIX" LC_NAME="POSIX" LC_ADDRESS="POSIX" LC_TELEPHONE="POSIX" LC_MEASUREMENT="POSIX" LC_IDENTIFICATION="POSIX" LC_ALL= > There's no output. But change it like this: > > $ perl -e 'print "a\nb\0"'| grep -z 'a' > a > b$ > > It found, and printed, the newline containing string. I would suspect > the regex engine is still honoring '. (dot) does not match newline' > convention but is OK with literals, if present. My grep -z acts like it used a regexp engine where "." matches newline. Only when -o is in effect and there is a newline in the match, there's no output. But the exit status is still good : $ printf 'a\nb\0'| (grep -z 'a.*b' && printf 'st=%d chars=' $? >&2) | wc -c st=0 chars=4 $ printf 'a\nb\0'| (grep -oz 'a.*b' && printf 'st=%d chars=' $? >&2) | wc -c st=0 chars=0 -- André Majorel <http://www.teaser.fr/~amajorel/> No one ever sends you any email ? Report a bug in Debian ! -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20100803182837.gc4...@aym.net2.nerim.net
