title: Exec : display stdout "live"
body: <p>I have this simple script :</p>
  
  <pre><code>var exec = require('child_process').exec;
  
  exec('coffee -cw my_file.coffee', function(error, stdout, stderr) {
      console.log(stdout);
  });
  </code></pre>
  
  <p>where I simply execute a command to compile a coffee-script file. But stdout never get displayed in the console, because the command never ends (because of the -w option of coffee).
  If I execute the command directly from the console I get message like this :</p>
  
  <pre><code>18:05:59 - compiled my_file.coffee
  </code></pre>
  
  <p>My question is : is it possible to display these messages with the node.js exec ? If yes how ? !</p>
  
  <p>Thanks</p>