title: how to know if file is still open for writing
body: <p><br>
  i have a function that writes to a file , how can i using another script check if the file is being used for writing or it is closed ?</p>
  
  <p><strong>Edit :</strong> this file might be opened for writing by other script/application/system ... </p>
  
  <p>thank you .</p>