To Introduce new Windows 2008 Additional domain controller we have to forest and domain. As part of the forest preparation we run the commaind adprep /Forestprep. Its recommended to run this command on the Schema Master Server

http://technet.microsoft.com/en-us/library/cc753437(WS.10).aspx

Below VBscript  will check on all the DCs for Schema update on the servername which are given in the file serverlist.  Script result will confirm if schema is updated successful or failed on the servers.

Dim objShell
set objShell = wscript.createObject(“wscript.shell”)

Set filesys = CreateObject(“Scripting.FileSystemObject”)
set filetxt1 = filesys.OpenTextFile(“C:\serverlist.txt”,1)

do Until filetxt1.AtEndOfStream
 Servername = filetxt1.Readline
 servername = trim(Servername)
 iReturn = objShell.Run(“CMD /C psexec.exe \\” & servername & ” schupgr > log.txt”, , True)
 Set filesys = CreateObject(“Scripting.FileSystemObject”)
 set filetxt = filesys.OpenTextFile(“C:\log.txt”,1)
 K = 0
 str = “Current Schema Version is 44”
 do Until filetxt.AtEndOfStream
  LineVerify = filetxt.Readline
  LineVerify = trim(LineVerify)
  If InStr(UCase(LineVerify), Ucase(“Current Schema Version is 44”)) Then
   K = 1
  End If
 Loop

 if iReturn = 1 AND K = 1 Then

  wscript.echo servername & “: Success”
 Else
  wscript.echo servername &”: Failure”
 End If

loop

Find the copy of the script in the below link

http://powershell.com/cs/members/smtpport25.wordpress/files/psexec.txt.aspx