param(
  [Parameter(Mandatory=$true)]
  [string]$Counter
)
if ($Counter -notlike "\*") {
  $Counter = "\" + $Counter
}
$tempFile = $Counter -Replace "\\","-"
$tempFile = $tempFile -Replace " ","_"
$tempFile = $tempFile -Replace "\*","asterisk"
$tempFile = "$env:temp\prev" + $tempFile + ".txt"
$curr = (Get-Counter $Counter -ErrorAction SilentlyContinue).CounterSamples.CookedValue
if ($curr -eq $null) {
 throw "Counter ($($Counter)) not found"
}

if (Test-Path $tempFile) {
  $prev = [int](Get-Content $tempFile -ErrorAction SilentlyContinue)
} else {
  $prev = $curr
}
$curr | Set-Content $tempFile 
if ($curr -gt $prev) {
  return [int]($curr - $prev)
} else {
  return 0
}