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Does anyone know how to read out registry key values in PowerShell? The equivalent request in CMD can be seen on the picture.

equivalent in CMD

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Get-ChildItem is the one to use, and a quickie would be:

Get-ChildItem 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion'

More examples here: https://msdn.microsoft.com/en-us/powershell/scripting/getting-started/cookbooks/working-with-registry-keys

If you want to get a specific key value:

$val = (Get-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\ComputerName\ActiveComputerName').ComputerName

And how to set/edit appropriately https://blogs.technet.microsoft.com/heyscriptingguy/2015/04/02/update-or-add-registry-key-value-with-powershell/

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This format, while very similar can also be used:

$username = Get-ItemProperty -path "HKCU:\Volatile Environment"

Which creates an object. The properties can be called using:

$username.username

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