How to insert a block of white spaces starting at the cursor position in vi?

Question

Suppose I have the piece of text below with the cursor staying at the first A currently,

AAAA
BBB
CC
D

How can I add spaces in

Answer 1

I would do like Nigu. Another solution is to use :normal:

1. to enter VISUAL-LINE mode
2. 3j or jjj or /D to select the lines
3. :norm I, the correct range ('<,'>) being inserted automatically

:normal is probably a bit overkill for this specific case but sometimes you may want to perform a bunch of complex operations on a range of lines.