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

From: Kaz Kylheku
Subject: grep is screwed on Debian, Ubuntu and others ...
Date: Fri, 4 May 2012 01:25:05 +0000 (UTC)
User-agent: slrn/pre1.0.0-18 (Linux)

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!

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

Watch this:

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

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

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