How to make codeigniter without index.php

In codeigniter index.php will be included by default in the URL. We can remove it so that our URL should be like http://digilib.uad.ac.id/buku/Buku.
To do that just do the following steps:

1. Open config.php in codeigniter application config directory
2. replace $config['index_page'] = "index.php" with $config['index_page'] = ""
3. Create a ".htaccess" file in the root of CodeIgniter directory
4. write the following script:
   

   RewriteEngine on
   RewriteCond $1 !^(index\.php|resources|robots\.txt)
   RewriteCond %{REQUEST_FILENAME} !-f
   RewriteCond %{REQUEST_FILENAME} !-d
   RewriteRule ^(.*)$ index.php/$1 [L,QSA]