1. Write a shell script that displays the following menu items, prompt the user to enter a selection, and then executes the command associated with that menu item. If required, prompt the user for additional commands should the menu item require it.

The menu items:

(a) Display a list of files and directories in the current directory

(b) Display a long list of the contents of the current directory

(c) Display a list of the last n messages in /var/log/messages, prompting for the value of n

(d) Display the contents of this script

(e) Display the contents of this script in reverse

(f) Exit the script Dont forget to have the script keep running until the user selects the exit option.

Linux keeps track of all log-in attempts in the file var/log/auth.log. Write a shell script that searches the contents of this file and displays any entries where a user logged onto the system as the administrative user (that user will have user name of root and a uid of 0).