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Removing duplicate lines ignore case

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#5 (permalink)

Old

12-01-2004

hellsd

hellsd is offline

Registered User

Join Date: Nov 2004

Posts: 20

I still don't get it, look at my example

file1 contain:
danIel
Kevin
DON
KEVIN
don

If I run your command as the following :
cat file1 | tr "[a-z]" "[A-Z]" | sort -u >outputFile
outPutFile contain:
DANIEL
DON
KEVIN

And this is not what I expect:
I need that the output will contain:
danIel

This is why I use uniq -u but it doesn't ignore case.

Thanks,

Roy.