How can I view the root directory along with all its subdirectories in Finder?
Navigate to / (e.g. use &#x2318;+&#x21E7;+G.)
Then, in list view hold &#x2325; while clicking the triangle. This will show all subdirectories of a certain folder.


By default, you'll don't see hidden files/directories. To show hidden files type the following commands in the Terminal.app:

defaults write com.apple.finder AppleShowAllFiles TRUE
killall Finder


You can use the value FALSE in the defaults write command to unto this action.