I am, yet again, working my way through Llama. I am making an attempt at Chapter 9 exercise 4. The question is on page 134 (of the 4th Edition. I just got the 5th edition and I plan on making my way through that too!).
To summarize, the question asks you to add a copyright line to each exercise you've written so far by naming the files on the command line. This was my solution, but it doesn't seem to be panning out:
When I run the program on my files the files are not altered. Any idea where I went wrong? Many thanks to the all knowing monks!