# Version 2
function numInstances([string]$process)
{
    @(get-process -ea silentlycontinue $process).count
}

$process_name=$args[0]
$minimum_num=$args[1]
$maximum_num=$args[2]

[int]$Number_of_process = numInstances $process_name
#write-host $Number_of_process
If ($Number_of_process -ge $minimum_num -And $Number_of_process -le $maximum_num){
	write-host "OK: $process_name has $Number_of_process process (within the range $minimum_num to $maximum_num)"; exit 0
	}
elseif ($Number_of_process -lt $minimum_num){
	Write-Host CRITICAL: "$process_name has $Number_of_process process (less than $minimum_num)" ; exit 2
	}
else {
	Write-Host CRITICAL: "$process_name has $Number_of_process process (greater than $maximum_num)" ; exit 2
	}