Create an .htaccess file containing the following line:
Options -Indexes
That is one option. Another option is editing your apache configuration file.
In order to do so, you first need to open it with the command:
vim /etc/httpd/conf/httpd.conf
Then find the line: Options Indexes FollowSymLinks
Change that line to: Options FollowSymLinks
Lastly save and exit the file, and restart apache server with this command:
sudo service httpd restart
(You have a guide with screenshots here.)
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