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How to replace one word across too many files at once

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# 1  
Old 12-14-2006
Tools How to replace one word across too many files at once
I'm trying to replace the word "core3" with the word "core2" across too many scripts which they all contain that word "core3" (Shell & XML scripts) all at once. Is there easy way with "sed" to do it?
Thanks Folks.
# 2  
Old 12-15-2006
try this
for file in <<filenamingconvenion>>
do
sed 's/core3/core2/g' file > tmp
mv tmp file
done
# 3  
Old 12-15-2006
Thanks a lot
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