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sed ignoring case for search but respecting case for subtitute

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# 1  
Old 09-02-2010
sed ignoring case for search but respecting case for subtitute
Hi
I want to make string substitution ignoring case for search but respecting case for subtitute. Ex changing all occurences of "original" in a file to "substitute":
original becomes substitute
Origninal becomes Substitute
ORIGINAL becomes SUBSTITUTE

I know this a little special but it's not the first time I need such a function and did not find a simple sed or awk flag for that.

Thanks for your help
# 2  
Old 09-02-2010
There is no sed flag to do such a substitution. You just have to do three search and substitute operations.
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