Below specified basic Ubuntu commands
Change owner
sudo chown user_name modules/ Using this command change owner for a particular folder. sudo chown -R user_name modules/ Using this command change owner for a folder along with inner files recursively.
Change permissions
sudo chmod 777 default/ Using this command change permissions for a particular folder or file. sudo chmod -R 777 default/ Using this command change permissions for a folder along with inner files recursively.
Change directory
$ cd default
Goto previous directory
$ cd ..
Get current cirectory
$ pwd
AviWeb 