I was writing a PowerShell script and it needed to know whether or not it was running in the administrative context. It’s a bit fiddly but here’s a one-liner that sets a Boolean variable for it:
$currentIdentity = New-Object System.Security.Principal.WindowsPrincipal([System.Security.Principal.WindowsIdentity]::GetCurrent())
$adminContext = $currentIdentity.IsInRole([System.Security.Principal.WindowsBuiltInRole]::Administrator)
Run that and $adminContext will be True if the script is running as admin, and False if not.