title: Store the log output into a file with cmdenv-output-file
body: <p>I need to recover the content of the show log module of Omnet++/Tkenv into a file, I added in the omnetpp.ini: </p>
  
  <p><strong>cmdenv-express-mode = false<br>
  cmdenv-output-file = log.txt</strong></p>
  
  <p>but I have two types of problems:<br>
  1) after the simulation, I did not find the "log.txt" If I do not create it<br>
  2) and when I created it before launching the simulation under ../omnetpp-4.6/log.txt also I find it empty    </p>
  
  <p>I used EV &lt;&lt; to display the content of variables that I used, I need to resolve this problem in order to analyze the traffic so how can I do that please?</p>