title: Powershell script to run another powershell script and wait till over
body: <p>i'm trying to run a script which will run another powershell script. 
  i need the first script to continue only after the other one is over.
  something like:</p>
  
  <p>start Copy.ps1 
  wait till Copy.ps1 is done<br>
  continue with the script</p>
  
  <p>tried using the Invoke-Expression but it doesn't have wait parameter. </p>