This is the the most useful function in Edit Plus. I was using unix cut and sort commands to sort and remove duplicates from a file, however this is convenient from the editor.
Copy and paste the list of rows you would like to remove dups from and from the main menu, select
clrl h in eclipse, enter the character you want to replace, in this case , for the new line, click on the downward arrow next to the text and then select new line. See the picture below.