linux-kernel - Re: [PATCH 1/3]: Replace kernel/timeconst.pl with kernel/timeconst.sh

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Message-ID: <20090104221356.GA32357@shareable.org>
Date:	Sun, 4 Jan 2009 22:13:57 +0000
From:	Jamie Lokier <jamie@...reable.org>
To:	Rob Landley <rob@...dley.net>
Cc:	Valdis.Kletnieks@...edu, Ingo Oeser <ioe-lkml@...eria.de>,
	Embedded Linux mailing list <linux-embedded@...r.kernel.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH 1/3]: Replace kernel/timeconst.pl with kernel/timeconst.sh

Rob Landley wrote:
> In a private email, Bernd Petrovitsch suggested "set -- $i" and then
> using NAME=$1; PERIOD=$2.  (I keep getting private email responses
> to these sort of threads, and then getting dismissed as the only one
> who cares about the issue.  Less so this time around, but still...)
> This apparently works all the way back to the bourne shell.

If you're going "all the way back to the bourne shell", don't use "set
-- $i"; use "set x $i" instead, and don't expect to do any arithmetic
in the shell; use "expr" or "awk" for arithmetic.

(Not relevant to kernel scripts, imho, since you can always assume
something a bit more modern and not too stripped down).

(I have 850 Linux boxes on my network with a bourne shell which
doesn't do $((...)).  I won't be building kernels on them though :-)

-- Jamie
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