On a machine with a decent set of command line tools, you could do something like

sort -u file > sorted_file_without_duplicates

where file has your data.

As kyle pointed out, this suggestion doesn't meet the OP's needs. Sorry, and please disregard.

Information about American English usage here and here. Floating point issues? Please read this before posting. — emc

In reply to Re: Trying to remove duplicate rows using hashes by swampyankee
in thread Trying to remove duplicate rows using hashes by Angharad

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