CFT: BSD-licensed grep [Fwd: cvs commit: ports/textproc/bsdgrep
sgk at troutmask.apl.washington.edu
Wed Jun 18 19:10:14 UTC 2008
On Wed, Jun 18, 2008 at 09:23:15AM -0700, Doug Barton wrote:
> pfgshield-freebsd at yahoo.com wrote:
> >On 2008-06-17, Gabor Kovesdan wrote:
> >>>egrep: empty (sub)expression
> >>I've looked at this and I have a patch with a workaround:
> >This general behavior should be considered a GNUism, the type of
> >thing that we want to avoid in scripts. Perhaps, if it's too
> >common, the workaround should be ifdef'd into a GNU compatible mode
> >or something.
> No, "here is a new bsd grep, but change all your scripts that have
> relied on legitimate behavior of grep in the past" is a non-starter. I
> haven't checked POSIX to see whether the particular construction I am
> using fits the spec or not, but I really don't care. We need to be
> feature-compatible with the GNU versions of these tools, both for
> legacy scripts and also for those users migrating over from linux.
FWIW, your RE violates strict conformance to Posix when
the variable is unset. See 9.4.3 and 2.2.1 in SuSv3.
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