Zusammenfügen von csv mit max 150 Zeilen oder aus 4 Dateien

@echo off &setlocal enabledelayedexpansion
set "quelle=D:\quelle"  
set "ziel=D:\ziel"  
set max=150
set maxfilecnt=4
:: ============
set sum=0
set filenum=1
set filecnt=0
for /f "delims=" %%a in ('dir /b /a-d /od "%quelle%"') do (  
	for /f "delims=:" %%b in ('findstr /rn "^" "%quelle%\%%a"') do set linecnt=%%b  
	set /a "calc=!sum!+!linecnt!"  
	if !calc! GEQ %max% (
		set /a filenum+=1
		set sum=!linecnt!
		set filecnt=0
	) else (
		if !filecnt! GEQ %maxfilecnt% (
			set /a filenum+=1
			set sum=!linecnt!
			set filecnt=0
		) else (
			set /a sum+=!linecnt!
			set /a filecnt+=1
		)
	)
	>>"%ziel%\file_!filenum!.txt" type "%quelle%\%%a"  
)

$quelle = "D:\quelle"  
$ziel = "D:\ziel"  
$max = 150
$maxfilecnt = 4
# -----------------
$sum = 0
$filenum = 0
$filecnt = 0
foreach($file in Get-ChildItem -LiteralPath $quelle -File | sort LastWriteTime){
    $txt = [io.file]::ReadAllLines($file.Fullname)
    if (($sum+$txt.Count) -gt $max -or $filecnt -ge $maxfilecnt){
        $filenum++
        $filecnt = 0
        $sum = $txt.Count
    }else{
        $sum += $txt.Count
        $filecnt++
    }
    Add-Content -Path "$ziel\file_$filenum$($file.Extension)" -Value $txt  
}

$variable=import-csv [Pfad zur CSV] -delimiter ';'   

$variable+=import-csv [Pfad zur CSV] -delimiter ';'   

$variable.count

$varibale | export-csv [Pfad zur CSV] -delimiter ';' -NoTypeInformation -append