cpu.ps1

$rui = $Host.UI.RawUI
$pos = New-Object System.Management.Automation.Host.Coordinates 0,($rui.CursorPosition.Y - 1)

# Drop ghost 'Enter' keyup
$rui.ReadKey("NoEcho,IncludeKeyUp") >$null

while ($true)
{
    $cputime = ((Get-WmiObject Win32_PerfFormattedData_PerfOS_Processor).PercentProcessorTime)[0]
    
    $rui.CursorPosition = $pos
    Write-Host "${cputime}% ".PadLeft(5) -ForegroundColor Green -NoNewline
    Write-Host ("`#" * [Math]::Truncate($cputime[0] * 20 / 100)).PadRight(20) -ForegroundColor Green -BackgroundColor Black -NoNewline
    
    1..10 | ForEach-Object {
        if ($rui.KeyAvailable)
        {
            $vk = $rui.Readkey("NoEcho,IncludeKeyUp,IncludeKeyDown").VirtualKeyCode
            if ($vk -ne 16 -and $vk -ne 17 -and $vk -ne 18) { break }  # modifiers
        }
        Start-Sleep -Milliseconds (1000/10)
    }
}

$rui.CursorPosition = $pos
Write-Host (" " * $rui.WindowSize.Width) -NoNewline

$rui.CursorPosition = $pos