Permission file and folder in Magento

sudo find /var/www/html/magentoInstallationFolder/ -type d -exec chmod 775 {} \;

sudo find /var/www/html/magentoInstallationFolder/ -type f -exec chmod 664 {} \;

sudo find -type d -exec chmod 775 {} \;

sudo find -type f -exec chmod 664 {} \;

Set Writable for 3 folders in root magento: var, media, app/etc
sudo chmod -R 777 var/  media/ app/etc/ downloader/

Done. Good Luck!

==== Magento UseGuide ====

find . -type f -exec chmod 400 {} \;
find . -type d -exec chmod 500 {} \; 
find var/ -type f -exec chmod 600 {} \; 
find media/ -type f -exec chmod 600 {} \;
find var/ -type d -exec chmod 700 {} \; 
find media/ -type d -exec chmod 700 {} \;
chmod 700 includes
chmod 600 includes/config.php