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

Just like on this screen- i want to copy only 'yellow part' . Of course I can do that manually, but in big file it's not too funny :-)

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.

Answer 2

There is a free app called DiffMerge.

Note : The option 'Show differences only' will be disabled until you switch to the bottom tab labeled Referenced View(Files as loaded). After that you should be able to use Differences Only view.