How do I duplicate a whole line in Emacs?

Question

I saw this same question for VIM and it has been something that I myself wanted to know how to do for Emacs. In ReSharper I use CTRL-D for this action. What is the least num

Answer 1

I cannot believe all these complicated solutions. This is two keystrokes:

runs the command kill-whole-line

C-/ runs the command undo

So C-/ to "copy" a whole line (kill and undo).

You can, of course, combine this with numeric and negative args to kill multiple lines either forward or backward.