how to modify .htaccess file to always redirect to www

Question

I would like to modify my .htaccess file so that when someone comes into my site without typing www the site always redirects them to the www version. For example, if my ur

Answer 1

Add something like this immediately after RewriteEngine on:

RewriteCond %{HTTP_HOST} ^example\.com$
RewriteRule ^(.*) http://www.example.com/$1 [R=301]