> I can't see the difference and in fact don't understand uniq's -u option al
> all Linux man pages say: "only print unique lines", but that is what uniq
> does by default anyway?!?

>From the german translation of uniq's man-page, you can deduct that "only 
print unique lines" actually means: "print lines that are _not repeated_ in 
the input".

A short test confirms that. i.e.:

        printf "a\nb\nb\nc\n" | uniq -u


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