.htaccess vs chmod [closed]

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http://serverfault.com – what is the difference between .htaccess and chmod? and what is the meaning of if someone say's that this file/directory is chmodded? how to rewrite my .htaccess file on server? how to change mod rights? and how to use them in web server? 1 <IfModule mod_rewrite.c> 2 RewriteEngine On 3 RewriteBase /webcpy/ 4 RewriteRule ^index\.php$ - [L] 5 RewriteCond %{REQUEST_FILENAME} !-f 6 RewriteCond %{REQUEST_FILENAME} !-d 7 RewriteRule . /webcpy/index.php [L] 8 </IfModule> what is the meaning of line 5or 6 (HowTos)