Script help
john bray
john at johnbray.name
Tue Oct 10 16:44:08 UTC 2006
On Mon, 2006-10-09 at 13:12 +0100, Dave Mitchell wrote:
> On Mon, Oct 09, 2006 at 12:43:22PM +0100, Dan Track wrote:
> > have a script that does the following:
> >
> > cat /tmp/file | while read rpm
> >
> > what I would like to do is to remove the "|" pipe command but keep the
> > "while read rpm" part while also somehow cat the contents of the file
> > into the "while read rpm" line, how can I do that?
>
> (
> while read rpm; do
> ...
> done
> ) < /tmp/file
>
actually, the simplest way to do this is:
while read rpm
do
...
done < /tmp/file
[where you put the do clause makes no difference -- it's just style.]
the parens dave used force the whole thing to be done in a subshell -- a
new process. if you're doing this once a day, it makes little
difference. but if you're going to be running this piece of code a
bunch, then extra processes may make a significant difference over time.
john
--
cleverly disguised as a responsible adult.
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