Fill in the functionality of the skeleton script you wrote in Exercise 1 of Chapter 7, “The Korn Shell,” so that it will perform the system administration tasks in your menu-driven interface.

Useful tasks to automate include:
• automatic deletion of core files
• automatic warnings to users that use a lot of CPU time or disk space
• automatic archiving

Use the find command to find all core files in a file system. Use ps to examine CPU usage. Use
the du command to determine the amount of disk space used by a particular user’s home directory
(you will need to be running as super-user to read another user’s home directory, although you can
test your script on your own directory). Use the find command to find files that are older than a
certain amount of time that are candidates for archival.