how to update google drive text file via google script?
<p>I want Google script variable data into Google drive as text file and update that text file regulatory via Google script!</p>

<p>The following code creates a text file and writes the data on it.I wonder how i can update the text file later ? </p>

<pre><code>function createTextFile()
{

  name="testFile.txt";
  name2="testFolder";

  var content = "this is text data to be written in text file";

var dir = DriveApp.getFoldersByName(name2).next()
var file = dir.createFile(name, content);
}
</code></pre>