Get-ContentFastTail.ps1

Switch ($true)
{
    {$TotalCount} 
    { ... }
    {$Tail} 
    {
        While ($Line = $File.ReadLine())
        {
            $RawData.Add($Line) | Out-Null
        }


        If ($Tail -gt $RawData.Count)
        {
            Write-Warning "Tail = $Tail is larger then file size, reading whole file"
            $Tail = $RawData.Count
        }
        For ($i = ($RawData.Count - 1) - ($Tail - 1) ; $i -le $RawData.Count - 1 ; $i++)
        {
            Write-Output $RawData[$i]
        }
    }