How to create a variable from specific part of command output in powershell script

Question

PowerShell script runs a command to give me total bytes and total free bytes of my harddisk. I want to pick those two returned values as variables to do some calculations with but I'm not sure how to set a variable to a specific part of a command's output.

After looking through similar questions I cant apply the same logic to my situations. I have never used PowerShell before and not very familiar with Windows servers. Any recommended tutorials would be welcomed.

fsutil volume diskfree C:

Total # of free bytes : 1234567

Total # of bytes: 7654321

Mark Harwood · Accepted Answer · 2019-10-16 09:23:41Z

3

I would instead use PowerShell's Get-WmiObject command and look at the Win32_LogicalDisk class. You could do something like this:

$cDrive = Get-WmiObject -Class Win32_LogicalDisk -Filter "DeviceId='C:'"

That way you can get the free space and size attributes of the drive and manipulate them however you like. For example, this would show you the free space on the C drive in GB:

[Math]::Round( $cDrive.FreeSpace / 1GB)

answered Oct 16, 2019 at 9:23

Mark Harwood

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2 Comments

a.smith Over a year ago

Would i be able to use this output to get the percentage of free space? (Freespace/Size)*100 = percent

Mark Harwood Over a year ago

@a.smith Yes [grin]. $percentFree = ( $cDrive.FreeSpace / $cDrive.Size) * 100

EylM · Accepted Answer · 2019-10-16 09:23:10Z

3

You can use WMI from Powershell.

$diskData = Get-WmiObject Win32_LogicalDisk -Filter "DeviceID='C:'" | Select-Object Size, FreeSpace

Write-Host $diskData.Size
Write-Host $diskData.FreeSpace

answered Oct 16, 2019 at 9:23

EylM

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1 Comment

Asher Over a year ago

This helped me a lot. The ability to separate the integer value from the variable name!

Lieven Keersmaekers · Accepted Answer · 2019-10-16 09:27:14Z

2

Get-WmiObject as mentioned in the other answers is the way to go but for the fun of it

$freespace, $size = [int64[]]((fsutil volume diskfree C:)[0,1] -split ': ')[1,3]
Write-Output $freespace, $size

_{Disclaimer: note that this breaks when microsoft decides to change the output format of fsutil}

answered Oct 16, 2019 at 9:27

Lieven Keersmaekers

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a.smith Over a year ago

Thanks, useful to know how to pick values from a command but yes i will go with Get-WmiObject as above

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