Show Hidden Files in Mountain Lion

This should be an option that’s available through the Finder preferences, but it’s not. Odd. Anyway, here’s how to do it. Open up a shell and run the following command: defaults write com.apple.Finder AppleShowAllFiles YES To undo: defaults write com.apple.Finder AppleShowAllFiles NO To check to see if the option is …

“App” can’t be opened because it is from an unidentified developer

UPDATE 12-20-2013: According to BBCAmerican below (thanks!), this applies to OSX Mavericks too! Got OSX Mountain Lion? Getting the above error code when trying to install an app? I tried installing Microsoft’s RDC 2.1.1 and encountered this same error. Apparently, there’s a service called GateKeeper that prevents unsigned apps from …