To display the complete directory path at the top of the Finder window in OSX Lion, execute these commands in the terminal:
defaults write com.apple.finder _FXShowPosixPathInTitle -bool YES
killall Finder
Important: Follow the syntax precisely, as Unix commands are case-sensitive.
This modification enables visibility of the full directory path in the Finder window’s title bar, providing quick reference to your current location within the file system.