How to compare two TXT files?

[makinero1]

How to compare two TXT files, delete duplicates and show only those which are missing in the first list?

A multitude of functions and I do not really know how to go about it.
I need a detailed tutorial (step-by-step)

[psguru]

There's no direct way to delete duplicates with ExamDiff Pro. The rest can be done for for the former you need a different tool.

[makinero1]

I did not know that it is so difficult because any program cannot be compared (I tried several popular programs)
Notepad++(plugin), PSPad, OpenOffice, WinMerge and other => These programs can not compare and extract only the missing links

[MSpagni]

For complex operations like these I suggest Xplorer2: http://zabkat.com/
Very powerful.
N.B. Probably for your needs the free version (http://zabkat.com/x2lite.htm) is too limited.