title: Writing to a text file using Javascript
body: <p>I want to write to a text file using javascript. I know that it is possible but there are some problems.</p>
  
  <p>I am running a javascript program that calculates the location of an object (its latitude &amp; longitude) which changes every 5 seconds; i want to write this information to a text file. The javascript program will soon run on a server and I'll use the information written to the text file to communicate with an Android app on my phone. </p>
  
  <p>So, my question really is:</p>
  
  <ol>
  <li><p>How can it be done properly? 
  <br><br>I know that there may be some permission issues but considering it won't be online and available to others will it be a problem and, if it is, should I go with PHP to do what I want? I know ASP is more Microsoft orientated and I work with a Mac so PHP would be the preference here.</p></li>
  <li><p>When writing a file, is it possible to write to an existing file or does the process simply destroy and recreate the same file?</p></li>
  </ol>