To see all files in the Finder (Mac OS X), “like hidden files starting with . (dot)” follow these steps.
1. Open “Terminal”
2. Type this command and press Enter key.
defaults write com.apple.Finder AppleShowAllFiles YES
3. You need to restart the Finder to make the command take effect. Hold down the “Option key”, then click and hold on the Finder icon in the Dock. When the menu appears, select “Relaunch”.
4. Now, you can see all files and folders on in the Finder.
5. If you want to hide files and change everything back to normal, just open Terminal and repeat the command with changing “YES to NO”, then press Enter key again. And restart the Finder.
defaults write com.apple.Finder AppleShowAllFiles NO