Exec : display stdout “live”

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I have this simple script :

var exec = require('child_process').exec;

exec('coffee -cw my_file.coffee', function(error, stdout, stderr) {
    console.log(stdout);
});

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 :

18:05:59 - compiled my_file.coffee

My question is : is it possible to display these messages with the node.js exec ? If yes how ? !

Thanks

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