Not really a one-liner when you try to make it readable…
With help from halr9000…
Calculate disk usage of all Linux Guest Virtual Machines:
[sourcecode language=‘jscript’]get-vm | where { $_.Guest.OSFullName -match “Linux” -band $_.Guest.state -eq “Running” } | Get-HardDisk | measure-object -sum CapacityKB[/sourcecode]