condition in powershell - disk usage

Question

I made a powershell script that displays the disk size and free space in GB and percent. How to make a condition here, so that after reaching 51%, a message is displayed that there is not enough space?

$props = @(
    'DriveLetter'
    
    
    @{
        Name = 'SizeRemaining'
        Expression = { "{0:N2} GB" -f ($_.SizeRemaining/ 1Gb) }
    }
    @{
        Name = 'Size'
        Expression = { "{0:N2} GB" -f ($_.Size / 1Gb) }
    }
    @{
        Name = '% Free'
        Expression = { "{0:P}" -f ($_.SizeRemaining / $_.Size) }
    }
)

Get-Volume -DriveLetter C | Select-Object $props 


if ( $_.SizeRemaining -lt 50 )
{
    Write-Host "warning"
}
else {
    Write-Host ("ok")
}

boxdog · Accepted Answer · 2022-08-18 22:48:08Z

You could just add another property to your output with the warning message in it. For example, add a Status property like this:

$props = @(
    'DriveLetter',    
    @{
        Name = 'SizeRemaining'
        Expression = { "{0:N2} GB" -f ($_.SizeRemaining/ 1Gb) }
    },
    @{
        Name = 'Size'
        Expression = { "{0:N2} GB" -f ($_.Size / 1Gb) }
    },
    @{
        Name = '% Free'
        Expression = { "{0:P}" -f ($_.SizeRemaining / $_.Size) }
    },
    @{
        Name = 'Status'
        Expression = { if(($_.SizeRemaining / $_.Size) -lt 0.5){"Low"}else{"OK"} }
    }
)

So, you can just do this to see all the information at once:

Get-Volume -DriveLetter C | Select-Object $props | Format-Table -AutoSize

Which gives output like this:

DriveLetter SizeRemaining Size      % Free Status 
----------- ------------- ----      ------ ------ 
          C 121.33 GB     464.14 GB 26.14% Warning

As it's just another property, you can access/manipulate it like any other property. For example, if you had lots of volumes on the system, you could just show the one with low space like this:

Get-Volume |
    Select-Object $props |
    Where-Object Status -eq 'Warning' |
    Format-Table -AutoSize

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