[lug] grep question

[Steve Sullivan]

Interesting.  Here's another test, running on Suse 10.2 professional:


$ echo $LANG
en_US.UTF-8



$ for pat in a b A B ab a-b AB A-B; do
   for text in a b A B; do
      echo pat: $pat  text: $text  result: $(echo $text | /usr/bin/grep "[$pat]")
    done
done

pat: a text: a result: a
pat: a text: b result:
pat: a text: A result:
pat: a text: B result:
pat: b text: a result:
pat: b text: b result: b
pat: b text: A result:
pat: b text: B result:
pat: A text: a result:
pat: A text: b result:
pat: A text: A result: A
pat: A text: B result:
pat: B text: a result:
pat: B text: b result:
pat: B text: A result:
pat: B text: B result: B
pat: ab text: a result: a
pat: ab text: b result: b
pat: ab text: A result:
pat: ab text: B result:
pat: a-b text: a result: a
pat: a-b text: b result: b
pat: a-b text: A result: A
pat: a-b text: B result:
pat: AB text: a result:
pat: AB text: b result:
pat: AB text: A result: A
pat: AB text: B result: B
pat: A-B text: a result:
pat: A-B text: b result: b
pat: A-B text: A result: A
pat: A-B text: B result: B

It looks like the Suse sort order is: aAbB
so [A-B] includes b but not a.
And [a-b] includes A but not B.

Steve


On Tue, Jun 12, 2007 at 07:45:16AM -0600, Chip Atkinson wrote:
> Ok, here's something to chew on:
> 
> chip at chip1:~> echo $LANG
> en_US.UTF-8
> chip at chip1:~> echo abc | grep A
> chip at chip1:~> echo abc | grep a
> abc
> chip at chip1:~> echo abc | grep "[A-Z]"
> abc
> chip at chip1:~> export LANG=C
> chip at chip1:~> echo abc | grep "[A-Z]"
> chip at chip1:~> 
> 
> The distribution is SuSE enterprise linux.  It seems that the LANG stuff
> only affects an expression in set of mini-experiments.  
> 
> Another thing that is odd is that there are many programs in /usr/bin with
> symlinks to their counterpart in /bin.  However, /usr/bin isn't a symlink
> to /bin.  I guess SuSE is "non-standard", but I thought it was a Red Hat
> derivative.
> 
> Chip
> 
> On Mon, 11 Jun 2007, Collins Richey wrote:
> 
> > On 6/10/07, Jeffrey Haemer <jeffrey.haemer at gmail.com> wrote:
> > > export LANG=C
> > >
> > > will cure this problem.
> > >
> > 
> > OK, read your explanation (LANG=C), but I have LANG=en_US.UTF-8, and I
> > don't have the problem. I find it hard to believe that any distro
> > would have a LANG= setting that would include lower case characters in
> > the range A-Z. Even in unadulterated EBCDIC, abcde, etc. would not be
> > a subset of A-Z.
> > 
> > OTOH, a distro with /usr/bin/grep is already quite non-standard.
> > 
> > -- 
> > Collins Richey
> >      If you fill your heart with regrets of yesterday and the worries
> >      of tomorrow, you have no today to be thankful for.
> > _______________________________________________
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> 
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-- 

========================================
Steve Sullivan    sullivan at mathcom.com

http://www.mathcom.com    303-494-7115
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