SHELL

set all permissions to folder in ubuntu

sudo chmod -R a+rwx path/directory

give permission to file ubuntu

sudo chmod 777 /path

give permission to user in ubuntu

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

grant all the permission to the user ubuntu

The simplest way is to use chown:

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

giving permission to folder in ubuntu

chmod -R a+rwx path

ubunto give permission for a user

# Make group "testuser" and user "testuser" the owner of the file "public_html"
sudo chown -R testuser:testuser /var/www/test/public_html