SHELL

ubuntu add permission to folder

sudo chmod -R 777 /var/DirectoryName

set all permissions to folder in ubuntu

sudo chmod -R a+rwx path/directory

how to change permissions for the whole folder in ubuntu

sudo chmod -R 777 DirectoryName

give permission to user in ubuntu

sudo chown -R testuser:testuser /var/www/test/public_html

giving permission to folder in ubuntu

chmod -R a+rwx path

ubuntu permission all file in folder

sudo chmod -R 755 <PATH_TO_FOLDER>

how assign permission to a folder and all contents in ubuntu|linux

only change the no(like 777,775 etc) according to your need 
current scenior i am giving full permission to file/sub-directories
chmod -R 777 your_directory_name