Converting VBScript's ScriptEngineBuildVersion Function
Definition: Returns the build version number of the scripting engine in use.
You’re right about that: it can be useful to know which build of Windows PowerShell you happen to be running. Fortunately you can determine that simply by calling the Get-Host Cmdlet and then taking a peek at the value of the Version.Build property:
$a = (get-host).version.build
When you run this command and then echo back the value of $a you should get the following, depending on which build you are using: