Is there a keyboard shortcut for "Show Hidden Files" in the Finder in El Cap? Related: Hotkey to show hidden files and folders in File Open dialog? 

Looks like there was a keyboard shortcut for it. But in 10.11.6 all I get when I press Cmd Shift . is the bonk sound.  

Is that keyboard shortcut gone? What's an easy way to get it back? 

Note that the shortcut works in file dialogs but not the standard Finder window. 

Not a duplicate: the top ranked question on Hotkey to show hidden files and folders in File Open dialog? does not work in El Cap.
There's no shortcut.
You could make one, but it would require a Automator action, containing a script, and set up as a Service, &amp; will re-launch the Finder each time it's used. [Mavericks could do it without relaunch but no other OS] 

For the number of times I actually use it, I just keep the script accessible instead.

--Toggle Invisibles
set newHiddenVisiblesState to "YES"
try
    set oldHiddenVisiblesState to do shell script "defaults read com.apple.finder AppleShowAllFiles"
    if oldHiddenVisiblesState is in {"1", "YES"} then
        set newHiddenVisiblesState to "NO"
    end if
end try
do shell script "defaults write com.apple.finder AppleShowAllFiles " &amp; newHiddenVisiblesState &amp; "; killall Finder"


Copy paste to Script Editor &amp; save as an App.
It will toggle visible state each time it's launched.