Make an .htaccess file to prevent index page duplicate content issues

Options +FollowSymlinks
RewriteEngine on
rewritecond %{http_host} ^abc.com [nc]
rewriterule ^(.*)$ http://www.abc.com/$1 [r=301,nc]

Options +FollowSymLinks
RewriteCond %{THE_REQUEST} ^.*/index.php
RewriteRule ^(.*)index.php$ http://www.abc.com/$1 [R=301,L]