Copy only difference (kdiff, winmerge, any diff like tool)

Question

Is there possibility of copy ONLY difference of two files? Like in winmerge, but, I can\'t find this option

Answer 1

WinMerge has a built-in and simple way to generate such "diff only" files, that they called "patches".

Click on "Tool", then on "Generate Patch...", and enter where you want to store the result:

You will obtain (for your example) the file

4,8c4,8
< HELLO WORLD
< HELLO WORLD
< HELLO WORLD
< HELLO WORLD
< HELLO WORLD
---
> 
> 
> 
> 
> 

That uses the standard, compact way of representing diff and is easy to manipulate.