Adding spacers to the OSX Dock

This is a nifty little hack, to make the Dock have some spacers in it. Mine looks like

To do this, run the following commands inside a terminal, one for each spacer you want added to the Dock:

% defaults write com.apple.dock persistent-apps -array-add '{"tile-type"="spacer-tile";}'

Now, these only become visible and, more importantly, movable after you restart the Dock. E.g.

% killall Dock

Hacking: 

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