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Problem with 'upper' class when nocaseglob

From: Lukáš Bařinka
Subject: Problem with 'upper' class when nocaseglob
Date: Thu, 2 Mar 2017 22:57:57 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.6.0

The version number of Bash:
   GNU bash, version 4.4.11(1)-release

The hardware and operating system:
   x86_64-pc-linux-gnu, Debian GNU/Linux 9

A description of the bug behaviour:
   When the nocaseglob option is set, the [:upper:] class in pattern
   does not match capital or small letters. On the other hand,
   [:lower:] works fine.

A short script or ‘recipe’ which exercises the bug and may be used
to reproduce it:
   $ touch a A
   $ echo [[:upper:]]
   $ shopt -s nocaseglob
   $ echo [[:lower:]]
   a A
   $ echo [[:upper:]]

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