1) check the owner and permission

ls -l /var/www/9099.com/shoppingCart/images/category


2) to change single file permision

sudo chmod o+w /var/www/9099.com/shoppingCart/images/category/web_hosting.jpg


3) to change the permissions of multiple files and directories 

sudo chmod 777 -R /var/www/9099.com/shoppingCart/images/category





how to change folder permission/ownership 

sudo chmod a+rwx /path/to/folder

sudo chmod a+rwx /usr/share



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WARN: /usr/share is world writable!
WARN: /usr/share is group writable!

try  
===

sudo chmod 644 /etc