Open the terminal
Full path in Finder title bar$ defaults write com.apple.finder _FXShowPosixPathInTitle -bool YES
Show all files
$ defaults write com.apple.finder AppleShowAllFiles YES
Hold 'alt' on your keyboard, then right click on the Finder icon in the dock and click Relaunch.
OR
$ killall Finder
To unable the F* keys on the keyboard:
Choose Apple Menu > System Preferences.
Click Keyboard.
Click the Keyboard tab.
Select the option Use All F1, F2, etc. keys as standard function keys.
Quit System Preferences.
IMPORTANT: When this option is selected, press the Fn key to use the special features printed on each key.
