In case you've never heard of Vim before:
Vim is a simple text-editor written for the Unix terminal and focuses on efficiency and speed. It succeeds at this by using _only_ the keyboard, no mouse action is required at all (or is even really possible). It uses several hotkeys and commands that are somewhat intuitive.
For example if you wanted to delete 3 words forward from the cursor you could type:
Code:
d3w
Or if you wanted to move the cursor down 5 lines you would type:
Code:
5k
A little disclaimer, learning Vim can take a lot of time however I think it's definitely worth the effort if not for the speed then for pure style and sense of elitism that comes with it.