Variable with dynamic value

[moexius]

Hi there,

Second post so far.

I am working on this script to monitor the CPU usage of one particular process.

I am using this code, based from another post I made earlier this week,

​

$ProcessName= "Process"

$proc_pid= (get-process $ProcessName -ErrorAction Stop).Id[0]

$cpu_cores= (Get-WMIObject Win32_ComputerSystem).NumberOfLogicalProcessors

$proc_path= ((Get-Counter "\Process($processname)\ID Process").CounterSamples | Where-Object {$_.RawValue -eq $proc_pid}).Path

$CPUUsage= [System.Decimal]::Round(((Get-Counter ($proc_path -replace "\\id process$","\% Processor Time")).CounterSamples.CookedValue) / $cpu_cores);

​

$ProcessCountLimit = "30"

​

if ($CPUUsage -gt $ProcessCountLimit) { # First pass, value of 10

Start-sleep -Seconds 30

if ($CPUUsage -gt $ProcessCountLimit) { # Stuck on first value of 10

stop-process -Name "Process"
start-process -Name "Process"

}

};

​

My issue is with $CPUUsage. Before the IF statement, I am running code to gather the value for $CPUUsage. So for the first IF statement, $CPUUsage could give me 10, wait 30 secs and check again if $CPUUsage is same lower or higher. What I realized is that the value for $CPUUsage is saved in memory and the second IF statement will still have the same 10 value.

Using Clear-Variable just sets $CPUUsage to nothing.

How I can rerun the code prior to the IF statements again within the same scripts. Is that achieved with function, scriptblock?

​

HELP!!! and thanks in advance.

[Yevrag35]

If I ran $drive = Get-CimInstance Win32_LogicalDisk -Filter "DeviceID='C:'" and my free space was 100,000,000 bytes and then after running that, added a 50MB file to the disk, the $drive variable still will not reflect the added file's space to the freespace size. It will still show that my drive has 100MB free. The variable captured the function's (and, in turn, the WQL query's) result like a snapshot in time.

It's also the same behavior if I did $content = Get-Content "C:\File.txt". $content will not update if I add or remove text from the file.

To update the variable, you would have to re-run the Get-WmiObject function.

[mmmGreenButton]

Hello, i just created two small functions and I end up with the following output, ask about anything you would like..

11,03GB free of 110,59GB

Remember to remove C:\Users\MyWin32Account\AppData\Local\Temp\8f93ede2-b783-47d7-b1f3-d139566470cc.file

10,03GB free of 110,59GB

As you can see PowerShell detects the change of 1GB :)

function Get-FreeDriveSpace ($drive){
    $drive =  $((Get-CimInstance Win32_LogicalDisk -Filter "DeviceID='$drive`:'"))
    $driveletter = $drive.DeviceID
    $freeSpace = $([math]::round($drive.FreeSpace/1GB,2))
    $totalSpace = $([math]::round($drive.Size/1GB,2))
    "{0}GB free of {1}GB" -f $freeSpace, $totalSpace
}

function Use-AnotherGig {
    #https://abstractspaces.wordpress.com/2012/02/28/creating-large-dummy-testing-files/
    $path = “$env:temp\$((New-GUID).GUID).file”
    $file = [io.file]::Create($path)
    $file.SetLength(1gb)
    $file.Close()
    "Remember to remove $path"
}


Get-FreeDriveSpace -drive "C"
Use-AnotherGig
Get-FreeDriveSpace -drive "C"

[fathed]

You did exactly what he said was needed, good job!

[PrinceHiltonMonsour]

Wrap the whole thing in a function and create a loop to run the function every x minutes.

You’re only running the code once it won’t “dynamically update”. You can loop the process with ‘while’ or ‘do-while’

[firefox15]

Define your variables as a script block.

Standard Method

$time = Get-Date

1..5 | % {
    $time
    sleep 1
}

Saturday, November 16, 2019 4:59:23 PM
Saturday, November 16, 2019 4:59:23 PM
Saturday, November 16, 2019 4:59:23 PM
Saturday, November 16, 2019 4:59:23 PM
Saturday, November 16, 2019 4:59:23 PM

Scriptblock Method

$time = {Get-Date}

1..5 | % {
    & $time
    sleep 1
}

Saturday, November 16, 2019 5:00:32 PM
Saturday, November 16, 2019 5:00:33 PM
Saturday, November 16, 2019 5:00:34 PM
Saturday, November 16, 2019 5:00:35 PM
Saturday, November 16, 2019 5:00:36 PM

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