Showing hidden folders in Mac 10.9.1

To show hidden folders in finder, for me this worked...

defaults write com.apple.finder AppleShowAllFiles -boolean true

and to undo... 

defaults delete com.apple.finder AppleShowAllFiles

• Open a terminal window and run...
• defaults write com.apple.finder AppleShowAllFiles -boolean true
• Now hold ‘alt’ on the keyboard and right click on the Finder icon and click on Relaunch (or run killall Finder in the terminal)

If that doesn't work try the above with... (undo with NO or FALSE respectively)

defaults write com.apple.Finder AppleShowAllFiles YES

or 

defaults write com.apple.Finder AppleShowAllFiles TRUE

Or if you just want to open a file, using the application's 'Open File' function (e.g. Sublime text 2). Press Command – Shift – [full stop] and all hidden files/folders will become visible, only in the Open File window, very handy!