How do you recursively adjust file and directory permissions?
From Joomla! Documentation
Using Joomla! Administrator[edit]
Go to Administrator → Global Configuration → Server.
Using the UNIX Shell[edit]
Note The find command assumes that it should start from the current directory. To be safe, go to your public_html directory and specify a path as the first argument. Some shells, such as bash on Apple OS X, must have a path specified in the find command.
find . -type f -exec chmod 644 {} \;
find . -type d -exec chmod 755 {} \;
chmod 707 images
chmod 707 images/stories
chown apache:apache cache
Notes
- Test all third-party extensions after changing permissions.
- You may need to reset write permissions to install more extensions.