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PowerShell – Get User Principal Name (One-liner)

As part of our Windows 10/Office 2016 project, we wanted to get the current user’s User Principal Name (UPN). There are several posts on the web with regards on how to do this, including utilising the ADSystemInfo COM object, or obtaining the current user’s ID and then searching Active Directory, however, neither are a clean PowerShell one-liner!

So, after a bit of research, here it is:

([ADSI]"LDAP://<SID=$([System.Security.Principal.WindowsIdentity]::GetCurrent().User.Value)>").UserPrincipalName

This command gets the current user’s Windows Security Principal’s value (or SID), which we then use to bind to its LDAP object. From this object, we can obtain the User Principal Name (or any other Active Directory value).

For our purpose, we wanted to put this value into a user environment variable. Here’s the script I came up with:

$UserUPN = ([ADSI]"LDAP://<SID=$([System.Security.Principal.WindowsIdentity]::GetCurrent().User.Value)>").UserPrincipalName
If ($UserUPN) { [Environment]::SetEnvironmentVariable("UPN", $UserUPN, "User") }
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