Date: Fri, 2 Feb 2007 14:20:26 -0500 From: "Dak Ghatikachalam" <dghatikachalam@gmail.com> To: freebsd-questions@freebsd.org Subject: Re: Korn shell script Question Message-ID: <ba29b9b40702021120i49ad48ccv3fd0c37dd83a2397@mail.gmail.com> In-Reply-To: <20070202185046.GA3073@fw.home> References: <ba29b9b40701311043u74a60268y390c32b5579fdd1d@mail.gmail.com> <20070131190658.GA49580@fw.home> <ba29b9b40701311127q1600c115k5eb0f69da0733ef6@mail.gmail.com> <20070131202202.GB49580@fw.home> <ba29b9b40702020810v6e371cb3i92a3504c6285b790@mail.gmail.com> <20070202185046.GA3073@fw.home>
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On 2/2/07, Kris Maglione <bsdaemon@comcast.net> wrote:
>
> On Fri, Feb 02, 2007 at 11:10:02AM -0500, Dak Ghatikachalam wrote:
> >{ while cat /tmp/availspace.$$; do false; done } |&
> >exec 5<&p
> >cat /tmp/reprocesses.$$|awk '/DATAFILE/ { print $0 }'|tr -d ' '|
> >while read file_b
> >do
> > read -u5 file_a
> > echo $file_b $file_a
> >done >/tmp/reprocessrecset.$$
> >
> >exec 5<&-
> >
> >this what you meant ?
>
> It doesn't matter where you put the redirects, so long as they're in
> order and you wind up closing the coprocess's standard output so that it
> exits. It's more a matter of style and taste than anything. Here are
> some more options if you're interested:
>
> As long as you haven't started any other background jobs, this would
> work in place of the final 'exec 5<&-':
> kill -INT %+
>
> Or, after you start the coprocess, you can store its PID, and kill that
> later:
> copid=$!
> ...
> kill -INT $copid
>
> Again, it's a matter of style and taste. If it's not to be part of a
> long running script, though, don't even worry about it.
>
Kris,
That is great , Thanks a lot for your input and insight.
It just amazes me how powerful a korn shell script in general any Unix
shell, process handling can be.
Thanks
Dak
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