title: How to duplicate a whole line in Vim?
body: <p>How do I duplicate a whole line in <strong>Vim</strong> in a similar way to <kbd>Ctrl</kbd>+<kbd>D</kbd> in IntelliJ IDEA/ Resharper or <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>&#8593;</kbd>/<kbd>&#8595;</kbd> in <strong>Eclipse</strong>?</p>