condition in powershell - disk usage - powershell

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")
}

Answer 1

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