You also need to sort the lines in case the duplicate records are not next to each other. 

sort file.txt | uniq > file2.txt

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Also, being a Unix-y solution, you may be leaving Windows users out in the cold unless they have cygwin or something similar installed.

In reply to Re: Re: Removing duplicate records in text file by pzbagel
in thread Removing duplicate records in text file by Anonymous Monk

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