Hi,

I wanted to add specific text to each row in a text file containing three rows. Example:

0 8 7 6 5 5
7 8 9 0 7 9
7 8 9 0 1 2

And I want to add a 21 at the beginning of the first row, and blank spaces at the beginning of the second two rows. To get this:

21 0 8 7 6 5 5
7 8 9 0 7 9
7 8 9 0 1 2

Thanks in advance!