$env:

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Windows

Show content of Windows environment variable

 in PowerShell

# show all environment variables
Get-ChildItem Env:

# show content of specific environment variable
$env:windir
$env:USERDOMAIN
$env:USERPROFILE
$env:USER_ROAMINGPROFILE
$env:LOGONSERVER
$env:COMPUTERNAME
$env:NUMBER_OF_PROCESSORS
$env:OneDrive
$env:OneDriveCommercial
$env:PATH
$env:PATHEXT
$env:PROCESSOR_IDENTIFIER
$env:APPDATA
$env:LOCALAPPDATA
$env:Common*
$env:Program*