Demonstration of PowerShell's Write-Progress cmdlet

write-progress_demo.ps1

$first = 'One', 'Two', 'Three'
$second = 'A', 'B', 'C'

$counter1 = 0
foreach ($number in $first) {
    $progress = @{
        Activity = "Pass $($number)"
        Status = 'Starting'
        Id = 1
        PercentComplete = ($counter1 / $first.Count) * 100
        SecondsRemaining = ($first.Count - $counter1) * ($second.Count * 4 + 3)
    }
    Write-Progress @progress
    Start-Sleep -Seconds 3
    $counter2 = 0
    foreach ($letter in $second) {
        $progress.Activity = "Item $($letter)"
        $progress.Status = 'Processing...'
        $progress.CurrentOperation = "Running process"
        $progress.PercentComplete = ($counter2 / $second.Count) * 100
        $progress.SecondsRemaining = ($second.Count - $counter2) * 4
        $progress.Id = 2
        $progress.ParentId = 1
        Write-Progress @progress
        Start-Sleep -Seconds 3
        Write-Progress @progress -Completed
        Start-Sleep -Seconds 1
        $counter2++
    }
    $counter1++
}