11.5) Exercise 9: Solution

The first command gives:

0a1
> 0.1   2.3

Indicating that on line 0 of the first file you need to add line 1 of the second file and it then shows you the contents of the right file, line 1.

The second command gives:

1d0
< 0.1   2.3

Tells you that in the first file you have a line that would need to be deleted to make it equal to the second file.