linux-kernel - Re: [PATCH 3/3] perf, tool: Add new event group management

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Date:	Wed, 21 Mar 2012 10:52:11 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Jiri Olsa <jolsa@...hat.com>, acme@...hat.com, mingo@...e.hu,
	paulus@...ba.org, cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 3/3] perf, tool: Add new event group management


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> # echo {}
> {}
> # echo {en,dis}able
> enable disable
> 
> 
> It somehow special cases {}, which is horrible.

Oh, indeed: brace expansion and sequence expressions both use 
curly braces:

 $ echo foo-{a,b,c}-bar
 foo-a-bar foo-b-bar foo-c-bar

 $ echo {1..10}
 1 2 3 4 5 6 7 8 9 10

Too bad, it would be rather intuitive. All the brace characters 
are taken by Bash.

Maybe something like:

 $ echo /minor-faults,major-faults/
 /minor-faults,major-faults/

although it looks a bit weird.

So ... how about using another grouping operator, such as '+'?

Something like:

 -e minor-faults+major-faults

While when comma separated they are not grouped, or so.

?

Thanks,

	Ingo
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