How do I duplicate a whole line in Vim in a similar way to Ctrl+D in IntelliJ IDEA/ Resharper or Ctrl+Alt+↑/↓ in Eclipse?

 

In Vim, you can duplicate a whole line by using the y (yank) command to copy the current line, and then the p command to paste it below or P to paste it above. Here's how to do it:

1. Position your cursor on the line you want to duplicate.

2. Duplicate the line below:

   • Press yy to copy (yank) the current line.
   • Press p to paste the copied line below the current line.

   For example, if your cursor is on the line:

   mathematica

Line 1

After pressing yy and then p, you will have:

mathematica

Line 1
Line 1

Duplicate the line above:

• Press yy to copy (yank) the current line.
• Press P (uppercase P) to paste the copied line above the current line.

For example, if your cursor is on the line:

mathematica

Line 2

After pressing yy and then P, you will have:

mathematica

3. Line 1
   Line 2
   

You can use these commands to quickly duplicate lines in Vim. It's a bit different from the IntelliJ IDEA or Eclipse shortcuts you mentioned, but once you get used to Vim's yank and paste commands, it becomes a fast and efficient way to duplicate lines.