How to get the difference between documents - batch-file

Question

Everyday, a document is created automatically named articles.txt.
I have to make several changes to the document.
After the changes made the document is named articles_Final + date.txt
As example : articles_Final_2016_01_07.txt
The documents are then moved to a directory ". \ HISTO \ FINAL".
I have to compare the two last document created and to write the difference in a new document result.txt
I show you my code for findind the two last documents
#echo off & cls
SETLOCAL EnableDelayedExpansion
set "Dossier=.\HISTO\Final"
set /a "n=0, limit=2"
for /F "delims=" %%a in ('dir /B /A-D /O-D /T:W "%Dossier%\*.*"') do (
echo "%%a"
2>nul set /a "n+=1, 1/(limit-n)"||goto :break
)
:break
pause
exit
And le code who compare the two document
Here, I write the name of them but i would like to find the way to write automaticly the result of my first code
findstr /v /g:articles_Final_2016_01_04.txt articles_Final_2016_02_04.txt >result.txt

Answer 1

#echo off
cls
SETLOCAL EnableDelayedExpansion
set "Dossier=.\HISTO\Final"
set /a "n=0, limit=2"
for /F "delims=" %%a in ('dir /B /A-D /O-D /T:W "%Dossier%\*.*"') do (
echo "%%a"
set "file[!n!]=%%a"
2>nul set /a "n+=1, 1/(limit-n)"||goto :break
)
:break
set file
echo findstr /v /g:%Dossier%\%file[0]% %Dossier%\%file[1]%
pause
exit
(untried)
The findstr command will just be echoed - you'd need to check it and redirect the output.
the set file command is simply a way of displaying all variables that start with file.

Answer 2

Here, the final solution
#echo off
cls
SETLOCAL EnableDelayedExpansion
set "Dossier=.\HISTO\FINAL"
set /a "n=0, limit=2"
for /F "delims=" %%a in ('dir /B /A-D /O-D /T:W "%Dossier%\*.*"') do (
echo "%%a"
set "file[!n!]=%%a"
2>nul set /a "n+=1, 1/(limit-n)"||goto :break
)
:break
set file
findstr /v /g:%Dossier%\%file[0]% %Dossier%\%file[1]% >>difference.txt
::fc /L %Dossier%\%file[0]% %Dossier%\%file[1]% >>difference.txt
pause
exit