Re: grep

[Bob Proulx]

Stepan Kasal wrote:
> jfp wrote:
> > $ echo "A" | grep '[a-z]'
> > A
> > $ echo "a" | grep '[A-Z]'
> > $ echo "b" | grep '[A-Z]'
> > b
> > $
> 
> Unfortunately, this is not a bug, but a (weird) feature of modern locales.

Agreed.  For those of us that are used to standard sorting these new
locales do seem strange.

I recommend that if you are looking for upper and lower case letters
that you investigate using the named character classes.  This avoids
much of the problems.

  echo "A" | grep '[[:upper:]]'
  A
  echo "A" | grep '[[:lower:]]'

And so forth.  You can find this documentation in both the info and
man pages.

Bob