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

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Message-ID: <20090104071555.GA1074@ellpspace.math.ualberta.ca>
Date:	Sun, 4 Jan 2009 00:15:55 -0700
From:	Michal Jaegermann <michal@...pspace.math.ualberta.ca>
To:	Rob Landley <rob@...dley.net>
Cc:	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

On Sat, Jan 03, 2009 at 07:36:04PM -0600, Rob Landley wrote:
> On Saturday 03 January 2009 06:28:22 Ingo Oeser wrote:
> > > +for i in "MSEC 1000" "USEC 1000000"
> > > +do
> > > +	NAME=$(echo $i | awk '{print $1}')
> >
> > cut -d' ' -f1  does the same
> >
> > > +	PERIOD=$(echo $i | awk '{print $2}')
> >
> > cut -d' ' -f2  does the same
> 
> From a standards perspective 
> http://www.opengroup.org/onlinepubs/9699919799/utilities/cut.html vs 
> http://www.opengroup.org/onlinepubs/9699919799/utilities/awk.html is probably 
> a wash, but from a simplicity perspective using the tool that _isn't_ its own 
> programming language is probably a win. :)

Vagaries of 'cut' aside you can limit yourself here to just shell:

set_name_period () {
   NAME=$1 ; PERIOD=$2
}
for i in "MSEC 1000" "USEC 1000000"
do
   set_name_period $i
....
done

or you may skip a shell function and do 'set $i' within a loop plus
assignments of $1 and $2 to NAME and PERIOD but that overwrites original
positional parameters (which may be already not important).

   Michał
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