Sets the process class of one or more processes

Set-ProcessPriorityClass.ps1

function Set-ProcessPriorityClass
{
    [CmdletBinding(SupportsShouldProcess, ConfirmImpact='Low')]
    param(
        # Names of the processes to change
        [Parameter(Mandatory, ValueFromPipeline)]
        [Alias("Name")]
        [String[]]
        $ProcessName,

        # Desired Priority of the process
        [Parameter(Mandatory)]
        [ValidateSet('Low', 'Below Normal', 'Normal', 'Above Normal', 'High', 'Realtime')]
        [Alias("PriorityClass","Class")]
        [String]
        $Priority,

        # Max attempts to retrieve process state
        [Parameter(Mandatory=$false)]
        [int]
        $MaxAttempts = 20
    )
    Process
    {
        foreach ($name in $ProcessName) {
            if ($PSCmdlet.ShouldProcess($name, "Sets the process priority to '$Priority'"))
            {
                $oldValue = $null
                $newValue = $null
                $process = $null
                $attempts = 1

                do {
                    Write-Host "Attempting to get process $name. Attempt $attempts of $MaxAttempts"
                    $process = Get-Process -Name $name -ErrorAction SilentlyContinue
                    $attempts++
                    Start-Sleep -Seconds 1
                } while (!$process -and $attempts -le $MaxAttempts)

                if ($process) {
                    $oldValue = $process.PriorityClass

                    if($oldValue -ne $Priority) {
                        $process.PriorityClass = $Priority
                    }

                    $newValue = $process.PriorityClass
                }

                [PSCustomObject]@{
                    ProcessName = $name
                    OldValue = $oldValue
                    NewValue = $newValue
                    IsChanged = $newValue -ne $oldValue
                }
            }
        }
    }
}