By mistake I removed 3 items from my dock.
Now I want to reset all items as it was.
Is there an option to do this, as I don't even know which items were removed.
Your Dock is meant to be customized, so don't worry about removing items.
If you do want to reset the Dock to its original configuration, launch Activity Monitor and navigate to
You do this all at once with this command line (but note that it wll delete the files instead of trashing them, so it is not reversible). To do that, open Terminal from your Applications/Utilities folder.
On OS X 10.8 Mountain Lion:
On older versions:
If you can't follow the instructions given by SidneySM here is what you would find in your default dock (from left to right).
I did as the first guidance but it not worked on Snow Leopard 10.6. So I finished it manually as below:
Note: You can do that one by one or with many selected items at the same time