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

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Date:	Sun, 04 Jan 2009 00:07:55 -0500
From:	Valdis.Kletnieks@...edu
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, 03 Jan 2009 19:36:04 CST, Rob Landley said:
> 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

Close, but no cee-gar.  cut does something counter-intuitive with multiple
blanks:

% echo 'a    b' | awk '{print $2}'
b
% echo 'a    b' | cut -d' ' -f2

% echo 'a    b' | sed -r 's/[ ]+/ /g' | cut -d' ' -f2
b

Unfortunately, 'sed -r' isn't in the opengroup.org list of required options,
and sed 's/  / /g' doesn't DTRT for 3 or more blanks (as it won't recursively
apply the change to a *new* double blank formed by the previous change).


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