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.

Answer 2

I realize this is an older post and that you were looking for a notepad++ solution, but I came across this while searching for a solution for the same issue myself.

I ended up just using cygwin -- which I already had installed at the time-- and gnu tools.

uniq -u <sorted.file>

This only outputs the unique lines in the sorted.file file. Example:

# cat test.file
this is a dup line
this is also a dup line
this is a dup line
this is unique line 4
this is yet another dup
this is a dup line
this is also a dup line
this is unique line 1
this is unique line 3
this is also a dup line
this is yet another dup
this is unique line 2

Since the file is not sorted, I do so first:

# sort test.file | uniq -u
this is unique line 1
this is unique line 2
this is unique line 3
this is unique line 4