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Nice one, at least is smaller that mine, hehe

Thanks guys
I appreciate your flash responses, this worked better than I expected :cool:
My final version is this command:
tr ' ] ' ' ' < prueba.txt | sort | awk '{print $1} ' | uniq -d | wc -l...

I have a file like this:
[token1]=value1
[token2]=value2
.
.
.
[token n]=valuen

The issue is that if we get to have i.e. the [token17] line duplicated it may incurr into errors in our...