Script help
Steven W. Orr
steveo at syslang.net
Mon Oct 9 14:44:30 UTC 2006
On Monday, Oct 9th 2006 at 13:12 +0100, quoth Dave Mitchell:
=>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
=>
=>
Using parens will create a child. You can use curlybraces instead to get
the same grouping without the child
{
while read rpm; do
...
done
} < $tmp
But there's no need since you can just apply the redirection to the while
loop itself.
while read rpm; do
...
done < $tmp
When I review shell code, one of the things I always look for is
unnecessarey processes from parens.
--
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steveo at syslang.net
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