Bash programming

$1.$ Write a script to read in three numbers as arguments, compare them, and list

them in an ascending order.

$ ex$1301045$

$103045$

$2.$ Write a command menu as follows:

$ ex$2$

Command Menu

a$.$ Current date and time

b$.$ Users currently logged in

c$.$ Name of the working directory

d$.$ Contents of the working directory

Enter a$,$ b$,$ c$,$ or d:

The function for each selection is as indicated in the menu.

$3.$ Write a script to read in an odd number n as an argument and calculate

the arithmetic summation $1+3+5+7+....+$ n$.$

$($hint: Use the looping statement.$)$

$ ex$311$

The sum is $36.$

$4.$ Write a script to read in a number n as an argument and calculate its factorial

n$!$ where n$!=$ n x $($n $-1)$ x $($n $-2)$

$ ex$46$

Factorial $5$ is $120$

$5.$ Write a script to back up multiple files into a directory, create the directory if the

directory doesn't exist, and display the message indicating the number of files has

been successfully backed up$.$ The last argument to the script is the directory.

$ ls

foo$1$ foo$2$ foo$3$ foo$4$ foo$5$ foo$6$

$ ex$5*$ progs

The directory progs is created.

$6$ files have been backed up into the directory progs.

$ ls

foo$1$ foo$2$ foo$3$ foo$4$ foo$5$ foo$6$ progs

$ ls progs

foo$1$ foo$2$ foo$3$ foo$4$ foo$5$ foo$6$

$6.$ Write a script to read in at least ten scores, sorts them, prints them out in an

descending order, and calculate their sum and average.

$ ex$6$

Input $10$ scores: $89536290887477869591$

Ordered scores: $95919089888677746253$

The sum of all the scores is $805.$

The average is $80\mathrm{.}5.$

$7.$ Write a command menu as follows:

$ ex$7$

Command Menu

a$.$ Enter a welcome message and write this message to a file msg$.$

b$.$ Send the contents of the file msg to all users who are logged in$.$

Enter a$,$ b :

The function for each selection is as indicated in the menu.

$($hint: b$.$ Use the mail command. For example, mail username $<$ msg$.)$