Linux Top for Windows - powershell

top.ps1

function top {
    $formatNPM = @{
        Label = "NPM(K)"
        Alignment = "Right"
        Width = 7
        Expression = {[long]($_.NPM / 1024)}
    }
    $formatPM = @{
        Label = "PM(M)"
        Alignment = "Right"
        Width = 8
        Expression = {"{0:N2}" -f [float]($_.PM / 1MB)}

    }
    $formatWS = @{
        Label = "WS(M)"
        Alignment = "Right"
        Width = 10
        Expression = {"{0:N2}" -f [float]($_.WS / 1MB)}

    }
    $formatHandles = @{
        Label = "Handles"
        Alignment = "Right"
        Width = 10
        Expression = {$_.Handles}
    }
    $formatCPU = @{
        Label = "CPU(S)"
        Alignment = "Right"
        Width = 10
        Expression = {"{0:N2}" -f [float]($_.CPU)}
    }
    $formatDelta = @{
        Label = 'CPU Delta'
        Alignment = "Right"
        Width = 10
        Expression = { "{0:N4}" -f [float]($_.CpuDelta) }
    }
    $formatId = @{        
        Label = "Id"
        Alignment = "Right"
        Width = 7
        Expression = {$_.Id}
    }
    $formatSI = @{        
        Label = "SI"
        Alignment = "Right"
        Width = 3
        Expression = {$_.SI}
    }
    $formatName = @{        
        Label = "ProcessName"
        Alignment = "Left"
        Width = 20
        Expression = {$_.ProcessName.PadRight(20)}
    }
    $form = $formatNPM, $formatPM, $formatWS, $formatHandles, $formatCPU, $formatDelta, $formatId, $formatSI,  $formatName    
    if ($host -and $host.UI.SupportsVirtualTerminal) {
        $psrl = get-module -Name PSReadLine
        if ($psrl) {
            Remove-Module $psrl
        }
        Clear-Host
        $lines = $Host.UI.RawUI.WindowSize.Height
        $cols = $Host.UI.RawUI.WindowSize.Width
        [int]$min = 10
        $topCount = ($lines - $min)
        if ($lines -le $min) {
            $topCount = $lines 
        }
        $sortDesc = 'CPU'
        $pp = $ProgressPreference
        $ProgressPreference = "SilentlyContinue"        
        $cpuChange = @{}
        try {
            while (1) {
                $newCpuChange = @{}
                $info = get-computerinfo
                $pInuse = $info.OsTotalVisibleMemorySize - $info.OsFreePhysicalMemory
                $phys = [math]::round(($info.OsTotalVisibleMemorySize/1MB),2)
                $physuse = ($pInuse/$info.OsTotalVisibleMemorySize).toString("P")
                $cpuAv = (Get-CimInstance -ClassName win32_processor | Measure-Object -Property LoadPercentage -Average).Average
                write-host "system: $($info.CsCaption) uptime: $($info.OsUptime) OS version $($info.OsVersion) $($info.OSDisplayVersion)"
                write-host "process: $($info.OsNumberOfProcesses) users: $($info.OsNumberOfUsers) Sort: $($sortDesc.PadRight(7)) help: ?"
                write-host "cpus: $($info.CsNumberOfLogicalProcessors) load: $($cpuAv)% Physical memory: $phys usage: $physUse"
                Get-Process | ForEach-Object {
                    if ($PID -ne $_.ID) {
                        $delta = 0.0
                        if ($cpuChange.ContainsKey($_.Id)) {
                            $delta = [math]::abs([float]$_.CPU - $cpuChange[$_.Id])
                        } 
                        Add-Member -InputObject $_ -NotePropertyName "CpuDelta" -NotePropertyValue  $delta
                        $newCpuChange[$_.Id] = [float]$_.CPU
                        $_
                    }
                } | Sort-Object -desc $sortDesc | Select-Object -first $topCount | format-table $form
                $cpuChange = $newCpuChange
                if ($host.UI.RawUI.KeyAvailable)                       
                {
                    $key = $host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown,IncludeKeyUp")
                    switch ($key.character) {
                        'c'{
                            $sortDesc = 'CPU'
                        }
                        'd' {
                            $sortDesc= "CpuDelta"
                        }
                        'h' {
                            $sortDesc = 'Handles'
                        }
                        'n'{
                            $sortDesc = 'NPM'
                        }
                        'p' {
                            $sortDesc = 'PM'
                        }
                        'q'{
                            Clear-Host
                            return
                        }
                        'w'{
                            $sortDesc = 'WS'
                        }
                        '?' {
                            Clear-Host
                            ""
                            ""
                            "keys: cdhnpw?"
                            "c: sort by total cpu time"
                            "d: sort by cpu time delta"
                            "h: sort by open handles"
                            "n: sort by nonpaged memory usage"
                            "p: sort by paged memory usage"
                            "w: sort by working set size"
                            ""
                            "q: exit top"
                            "?: help screen"
                            ""
                            "type any key to continue"
                            $key = $host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown")
                        }
                    }
                }
                else {                    
                    Start-Sleep 0.5
                }
                if (($Host.UI.RawUI.WindowSize.Height -ne $lines) -or 
                ($Host.UI.RawUI.WindowSize.Width -ne $cols)) {
                    Clear-Host
                    $lines = $Host.UI.RawUI.WindowSize.Height
                    $cols = $Host.UI.RawUI.WindowSize.Width
                    $topCount = ($lines - $min)
                    if ($lines -le $min) {
                        $topCount = $lines 
                    }
                }
                $host.UI.RawUI.CursorPosition = @{x = 0; y = 0}
            }
        }
        finally {
            $ProgressPreference = $pp 
            if ($psrl) {
                import-Module $psrl
            }
        }
    }
}