linux-kernel - Re: [patch 1/3, resend] scripts: replace gawk, head, bc with shell, update

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Date:	Tue, 6 Feb 2007 17:47:52 +0100
From:	Oleg Verych <olecom@...wer.upol.cz>
To:	Mark Lord <lkml@....ca>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jesper Juhl <jesper.juhl@...il.com>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Sam Ravnborg <sam@...nborg.org>,
	William Stearns <wstearns@...ox.com>,
	Martin Schlemmer <azarah@...feratu.za.org>
Subject: Re: [patch 1/3, resend] scripts: replace gawk, head, bc with shell, update

On Tue, Feb 06, 2007 at 09:49:47AM -0500, Mark Lord wrote:
> Oleg Verych wrote:
> >scripts: replace gawk, head, bc with shell, update
> >
> >  Replacing overhead of using some (external) programs
> >  instead of good old `sh'.
> ...                                  <---------------,
> >-    t4=`echo $t3 | gawk '{ print $1 }'`            |
> >-    t5=`echo $t1 | gawk '{ print $1 }'`            |
> >-    t6=`echo $t4 - $t5 | tr a-f A-F`               |
> >-    t7=`( echo  ibase=16 ; echo $t6 ) | bc`        |
> >+    t4=`field 1 $t3`                               |
> >+    t5=`field 1 $t1`                               |
> >+    t6=`printf "%lu" $((0x$t4 - 0x$t5))`           |
> ...                                                  |
>                                                      |
> >From where do we obtain this new "field" command ?  |
                                       `---- here -----'

Without jokes, it even commented:

+# awk style field access
+field() {
+  shift $1 ; echo $1
+}
+

> Cheers
____
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