Yes I am waiting for more than 10 seconds. This time I started with a non empty file. (with the string "quick brown fox jumps over lazy dog" already there).

Now I added a line "1 2 3" and saved the file. The utiltity actually printed a blank line.

Then I waited for 15 seconds and I added line "a b c d" to the file and saved it. Now the utiltity printed "1 2 3"

regards,
Abhishek.