Finder Keyboard Shortcut to Show Invisible Files
macOS 10.12 #protip: Finder supports ⇧⌘. to toggle visibility of hidden files, just like Open/Save panels have for a while.
That’s Shift-Command-Period.
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I've taken the liberty of writing this up here:
http://www.mackungfu.org/ShowinvisiblefilesinFinderviaabuiltinkeyboardshortcut
... but in summary this has always worked on open/save dialog boxes, but the fact it works in Finder windows is new to macOS Sierra.