get-childItem "C:UsersuserDocumentsAzureIntunemanagement*.csv" | foreach {

    $filePath = $_

    $lines =  $lines = Get-Content $filePath | Select -Skip 1
    $linesToWrite = switch($getFirstLine) {
           $true  {$lines}
           $false {$lines | Select -Skip 1}

    }

    $getFirstLine = $false
       Add-Content "C:UsersuserDocumentsAzureIntunemanagementmaster_list.csv" $linesToWrite
    }