Group similar apps in OS X dock with spacer tiles

OS X’s dock allows the addition of spacer tiles, blank objects that occupy the same space as an application icon.  Spacer tiles are quite helpful for organising applications into logical groups.

Adding spacer tiles is relatively simple:

  1. Launch Terminal (from Applications/Utilities).
  2. Cut and paste the following into the command line, once for each tile you want to add.  (Need 4 tiles?  Run it 4x.)
    defaults write persistent-apps -array-add '{tile-data={}; tile-type="spacer-tile";}'
  3. Restart the dock:
    killall Dock

Spacer tiles behave like normal application icons: they can be dragged into any position, or dragged out of the dock completely to remove them.

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