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Linux Sort/Dedupe but with a header on line 1

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Last Modified: 2012-06-27
I have the following command:

sort FILENAME -u >> FILENAME-2


What it is meant to do is DEDUP AND SORT. However, my files have a one line header at the top; EX.

Email,Fname,Lname
rvalleriani@test.com,Chris,Valler
test@test.com,Mike,Liuk
m@m.com,Maurico,Hammer


The above command will randomize everything including the first line, which it shouldn't do!!

I was told to try this:

tail +2 FILENAME| sort FILENAME -u >> FILENAME-2

However, this doesn't seem to work either.

Any suggestions?
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