On Thu Jun 14 10:37:21 EDT 2012, tlaro...@polynum.com wrote: > On Thu, Jun 14, 2012 at 04:13:12PM +0200, Gorka Guardiola wrote: > > Also this: > > > > cpu% echo hola | grep '*' > > grep: *: syntax error > > The plan9 regexp are mainly Extended Regular Expression. If the POSIX > description is taken, a leading '*' is a syntax error. I guess that the > leading '*' followed by some non empty pattern is a Plan9 way to get > "grep -F" ? > > > cpu% echo hola | grep '' > > grep: empty pattern > > From the POSIX description, an empty pattern is not allowed. '*' is not > an empty pattern.
i'm sorry this just isn't correct. see the man page. plan 9 grep has no intentions of being posix. grep '*' can be seen as a literal escape plus the pattern of ''. this is an empty pattern, thus an error. - erik
