title: Rename files on android rooted phone using script
body: <p>I have an android phone and I keep downloading some media files which I would not want to appear in gallery. Don't think me absurd here. In order to accomplish this task, I have written a small &amp; easy script. Here it is.</p>
  
  <pre><code>echo "Below files will be hidden."
  for fName in `ls /storage/extSdCard/Download/*.mp4`
  do
  echo $fName
  mv -f $fName `basename $fName .mp4`.bak
  done
  </code></pre>
  
  <p>When I execute this script using "File Explorer" application's "Script executor" utility with root user, I get an error message as below.</p>
  
  <pre><code>mv: can't create 'abc.mp4': Read-only file system
  </code></pre>
  
  <p>I assume "root" user has free run in unix/linux based systems. Can anybody guide me on this?</p>