How to: Organize your Dock with these Dock spacers

If you’re like me and have quite a few applications in your Dock, you have probably thought about organizing them. Luckily, the solution is already built into your Mac and your Dock could be organized in seconds.

1. Open up Terminal (Command + Space: Type in “Terminal”)
2. Paste this line of code:

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

3. After that, type in:killall DockP

You should now have a transparent spacer in your Mac’s dock that you can rearrange. Add as many as you want.

-ir

Source: Lifehacker (http://lifehacker.com/5993307/easily-add-spacers-to-your-macs-dock)