linux-kernel - Re: [PATCH] kconfig: simplification of scripts/extract-ikconfig

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Message-ID: <20090710075530.GB6263@cr0.nay.redhat.com>
Date:	Fri, 10 Jul 2009 15:55:30 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	Dick Streefland <dick@...eefland.net>
Cc:	Amerigo Wang <xiyou.wangcong@...il.com>,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kconfig: simplification of scripts/extract-ikconfig

On Thu, Jul 09, 2009 at 10:26:51AM +0200, Dick Streefland wrote:
>On Thursday 2009-07-09 10:38, Amerigo Wang wrote:
>| I appologize for my delay, I totally missed this thread, sorry.
>| 
>| I just tested it, it works! So,
>| 
>| Tested-by: WANG Cong <xiyou.wangcong@...il.com>
>
>Great, thanks.
>
>| But, I still don't understand the behavior of 'grep -abo',
>| please try the following commands:
>| 
>| echo -e '\x01\x02\x03\x04' > test.bin
>| od -x test.bin
>| tr $'\x01\x02\x03\x04' '1234' < test.bin | grep -abo '4'
>| 
>| Am I missing something here??
>
>The output with grep-2.5.3 is 3:4, which means that the string "4" was
>found at offset 3 (0-based). With grep-2.5.1, you get 0:4, which means
>that the line containing the string "4" has offset 0. The "tr" commands
>in the script ensure that the patterns we are looking for are always at
>the start of a line, so that it doesn't matter which version of grep is
>installed.

Hmm, I see, it is really a _big_ change. :)

Have you checked other version of grep? I mean lower version, of course,
does your script work with them too?

Thank you!

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