On Tue, Jul 5, 2011 at 3:56 AM, dexen deVries <dexen.devr...@gmail.com> wrote: > on plan9port: > % echo foobar | 9 grep '$JUNK' > -> foobar > > that is, p9p grep matches any line with regular expression in form of > $ANY_REGEX > > why is it so?
It's an ancient bug in the Plan 9 grep, a complication of the way Ken implemented ^ and $: as aliases for \n (!). It looks like someone added a workaround for this one case in the Plan 9 sources since I forked them for plan9port seven years ago. I pulled it in. For fun, try seeing what matches '^$^$' across a variety of grep implementations. Russ
