Re: nocaseglob doesn't always work as expected.

[Bob Proulx]

Alexey Vinogradov wrote:
> alexey@ubuntu64:/tmp$ shopt -u nocaseglob; shopt -s nullglob; for a in
> [B-C]* ; do echo $a; done

Since you do not mention your locale setting I assume that you are not
aware of how it affects ranges.  Here if your locale setting uses
dictionary sort ordering then [B-C] is the same as [BcC].

  $ echo b | env -i LC_ALL=en_US.UTF-8 grep '[B-C]'
  $ echo B | env -i LC_ALL=en_US.UTF-8 grep '[B-C]'
  B
  $ echo c | env -i LC_ALL=en_US.UTF-8 grep '[B-C]'
  c
  $ echo C | env -i LC_ALL=en_US.UTF-8 grep '[B-C]'
  C

In the above you can see that lower case c exists in the range B-C but
lower case b does not.

In a locale that sets dictionary sort ordering the collating sequence
is aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ.

[a-z] is the same as [aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYz]
[A-Z] is the same as [AbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ]

You can read more about locales in the online standards documentation.

  
http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html#tag_08_02

Personally I set the following in my ~/.bashrc file.

  export LANG=en_US.UTF-8
  export LC_COLLATE=C

Bob