grep is screwed on Debian, Ubuntu and others ...

[Kaz Kylheku]

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=655293

I ran into this doing a simple grep job that needed to match upper
case characters, and so I started Googling.  This was only reported in January.

But the Red Hat people knew about what looks like the same bug two years ago.
Oops, they didn't share!

https://bugzilla.redhat.com/show_bug.cgi?id=583011

(So much for the spirit of collaboration in open source. My distro, my
patches, screw you!)

Watch this:

$ echo a | grep '[A-B]'
a
$ echo b | grep '[A-B]'
$ echo b | grep '[:upper:]'
$ echo B | grep '[:upper:]'
$ echo E | grep '[:upper:]'
$ echo e | grep '[:upper:]'
e

Ooops! Someone doesn't have a regression test suite, or at least not one
that is worth a damn.