cd /d c:\
set "latest="
for /f %%a in ('dir /b /o-d /a-d /tw') do (set "latest=%%a" & goto :found)
:found
if not defined latest exit /b
for /f "tokens=1,*" %%a in (
'diff "c:\%latest%" "c:\2.txt" ^| findstr /r /c:"^<" /c:"^>"'
) do (
>> "c:\786.txt" echo(%%b
)
Ordering by date descending, the latest file is the first, so on first iteration assign the file name and exit of the for
loop.
Then check if any file has been found. It not, end of the script
If we have a file, compare latest file against the indicated one and send the filtered lines to the final file.
EDIT - Refactor code to made it more usable and adapt to comments. Search for last file in folder moved to a subroutine.
@echo off
setlocal enableextensions disabledelayedexpansion
call :getLatestFileInFolder "c:\" latestC
call :getLatestFileInFolder "d:\" latestD
if not defined latestC ( echo NO File in C & exit /b )
if not defined latestD ( echo NO File in D & exit /b )
for /f "tokens=1,*" %%a in (
'diff "%latestC%" "%latestD%" ^| findstr /r /c:"^<" /c:"^>"'
) do (
>> "c:\786.txt" echo(%%b
)
endlocal
exit /b
:getLatestFileInFolder folderToSearch variableToReturn
setlocal
set "folder=%~1" & if not defined folder set "folder=%cd%"
set "latest="
pushd "%folder%"
for /f "tokens=*" %%a in ('dir /b /o-d /a-d /tw 2^>nul') do (set "latest=%%~fa" & goto :latestFileFound)
:latestFileFound
popd
endlocal & set "%~2=%latest%" & goto :eof