How do you replace a column of characters in visual block mode?
Answer
<C-v>jjr*
Explanation
Enter visual block with <C-v>, select a column with j, press r followed by the replacement character. Replaces all selected characters.
<C-v>jjr*
Enter visual block with <C-v>, select a column with j, press r followed by the replacement character. Replaces all selected characters.