notepad++ delete duplicate and original lines to keep unique lines

Question

I have a text file with many duplicate lines and I am looking for a way to delete this duplicate and the original lines in notepad++, so that I can keep just the unique line

Answer 1

Assume your file is something like this

Then select the text and use TextFX Tools --> Sort lines case insensitive (at column). Make sure that you have Sort outputs only UNIQUE (at columns) line selected.