There was a time in the history of macOS (formerly known as Mac OS X) when you had to use a Terminal command or a third-party utility to show the hidden files and folders littered all over your storage drive. I won’t go down the rabbit hole of why you would want to see these hidden files and folders, but know that Apple has finally built-in a simple keyboard shortcut to do just that—and it works in the Finder as well as Open/Save dialog boxes.
Simply hit Command + Shift + . (period key) and macOS will instantly make them visible (as seen on the right in the image above). Hit the shortcut again and they return to their hidden state.
Yes, this is a Sierra only feature.
Thanks for clarifying. I am using El Capitan
Is this only in Sierra?
Confirmed. Works in 10.12 Sierra.
I tried. It doesn’t work for me.