Compact a Linux vhdx for Hyper-V via PowerShell

To compact a vhdx file via command line (PowerShell)

> mount-VHD -Path c:\VM\virtual_machine.vhdx -ReadOnly
> optimize-VHD -Path c:\VM\virtual_machine.vhdx -Mode Full
> dismount-VHD -Path c:\VM\virtual_machine.vhdx

References:-

1. Optimize-VHD
2. Compact Linux guest virtual hard disk