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Re: egrep oddity



On Ne 05-02-12 | 23:04, Sven Joachim wrote:
> On 2012-02-05 22:31 +0100, Tomas Volka wrote:
> 
> > On Ne 05-02-12 | 16:03, Neal Murphy wrote:
> >> For quite some time now, I've been getting peeved with egrep not doing what it 
> >> should.
> >> 
> >> I have Squeese installed and up-to-date. In an xterm running bash or on a 
> >> console running bash or dash, this command:
> >>   ls -C1 | egrep "^[A-Z]"
> >> returns all lines except those beginning with 'a'. Even the following commands 
> >> exhibit similar behavior:
> >>   alias|sed -e 's/^a/b/'|egrep "^[A-Z]"  # passes sed's output untouched
> >>   alias|sed -e 's/^a/A/'|egrep "^[A-Z]"  # passes sed's output untouched
> >> 
> >> These commands behave the same way on another Squeeze installation at another 
> >> location. Also, 'grep -E' behaves the same way.
> >> 
> >> The commands behave as expected on a different GNU/Linux system.
> >> 
> >> Does anyone else see this behavior? Or do I need to clean my pipe and smoke 
> >> something better?
> >> 
> >> Thanks,
> >> N
> >
> > The "^[A-Z]" range will never match line beginning with a, since the range 
> > matches only uppercase characters. 
> 
> Not quite true, this very much depends on the locale.
> 
> Sven

Tried this under cs_CZ.UTF-8 and C locales and it behaves as i outlined. I'm curious 
under which locale is the result different, as i've never experienced such behavior.

Thanks,
Tom


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