Task $03(30$ points$)$ Task $04(40$ points$)$

Write an interactive Bash script that manages a collection of books. The script takes no

command line arguments, instead, the user enters the program and then enters commands

within it that are read as input. Use a loop so the user can keep trying commands until they exit.

The books must be stored in an array named books.

The following internal commands must be supported:

add $[$book$\_$name$]$

Adds a book to the collection.

Calls a function that you create named add$\_$book$()$ which adds the book

to the array and displays a confirmation message.

remove $[$book$\_$name$]$

Removes a book from the collection.

Calls a function that you create named remove$\_$book$()$ which removes the

book from the array and displays a confirmation message.

list

Lists all of the books in the collection.

Calls a function that you create named list$\_$books$()$ which displays all of

the books in the collection.

help

Displays a message to the user with a hint as to how the command should be run

$($sample syntax of the command usage$).$

exit

Exits the script.

You must use a case statement in your script to make the decision on which function to run. The

help and exit commands do not have to be implemented as functions, but you may choose to do

so if you wish.

An error message should be displayed if the user enters no command or an invalid command

and it should tell them how to get help $($using the option above$).$

Write a Bash script that takes one command line argument. The argument should specify the

type of system information to display. The following command line arguments must be

supported:

cpu

Display information about the CPU

Command to use in your script: Iscpu

Important: You must limit the output using awk to only match what

is displayed in the screenshots below for this option.

memory

Display information about the memory

Command to use in your script: free $-$h

disk

Display information about the disk usage

Command to use in your script: df $-$h

all

Displays all of the above. Using all of the same commands.

You must use a case statement in your script to make the decision on which command to run.

In addition, if the script is run with no arguments provided, it should display a message to the

user with a hint as to how the command should be run $($sample syntax of the command usage$).$

An error message should be displayed if the user enters an invalid argument.

Provide labels for the type of information being displayed before you display it as shown in the

screenshots below.

Here are screenshots of the expected behavior, testing all scenarios described above: