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.