Vorhandene TXT per Batch aktualisieren

@echo off
::-------------
set "file=C:\ordner\my.txt"  
::-------------
set "filenew=%temp%\my_neu.txt"  
set "tmpfile=%temp%\dict.txt"  
del "%tmpfile%" >nul 2>&1  
del "%filenew%" >nul 2>&1  

>"%filenew%" (for /f "tokens=1,* delims=:" %%a in ('findstr /n "^" "%file%"') do (  
    echo(%%b|find "=" >nul && (  
        for /f "tokens=1 delims==" %%c in ("%%b") do (  
            find "%%c" "%tmpfile%" >nul 2>&1 || (  
                echo(%%b
                echo(%%c>>"%tmpfile%"  
            )
        )
    ) || (echo(%%b)
))
move "%filenew%" "%file%"  

$file = 'D:\new.txt'  
$dic = @()
[regex]::matches((gc $file -raw),'(?ism)^((DATUM:\s*)?\d{2}\.\d{2}\.\d{4})(.*?)(?=^DATUM|\z)').Captures | %{  
    $subcount = 0
    $subvalues = @(); $subvalues += "`r`n" + $_.Groups[1].Value + "`r`n"  
    $_.Groups[3].Value -split [Environment]::NewLine | ?{$_.trim() -ne ""} | %{  
        if ($_ -match '='){  
            $part = $_.Split('=')  
            if ($part -notin $dic){
                $dic += $part
                $subcount++
                $subvalues += $_
            }
        }
    }
    if ($subcount){$subvalues}
} | sc 'D:\new.txt'