[6] Write a program that changes to some particular (hardcoded) directory, like the system’s root directory, then executes the ls -l command to get a long-format directory listing in that directory. (If you use a non-Unix system, use your own system’s command to get a detailed directory listing.)

[10] Modify the previous program to send the output of the command to a file called ls.out in the current directory. The error output should go to a file called ls.err. (You don’t need to do anything special about the fact that either of these files may end up being empty.)