讲解Linux Shell、辅导Java/C++语言、讲解myscript、CS/python编程辅导

Linux Shell Scripting II

Procedure

Create a script file for the purpose of user and group management in Linux. Assume that

the script is run with elevated permissions.

1. Create a script file called myscript.sh using vim or vi.

2. The first line of the script file must force the use of the bash shell.

3. At the beginning of the script file there must be a section of comments that contain

the following items:

assignment number

student name and student number

course and lab section number

name of the script file

the submission date

a description of what the script file does

4. Your script file must be properly commented.

5. It must contain a menu that gives the user a choice of five items labeled A - F and

Q, and a prompt asking for what the user’s choice is. Use the following labels for the

menu.

Create a user account

Delete a user account

Change supplementary group for a user account

Change initial group for a user account

Change default login shell for a user account

Change account expiration date for a user account

Quit

6. This script file must loop using a while loop. When it runs, choose one menu item.

A message must be displayed if an invalid option is chosen.

7. The menu choice must be decoded using an if-elif-else structure.

8. The if structure must accept upper or lower case letters. Use || operator to allow

upper or lower case characters.

If A or a is chosen, the script must prompt to enter the following information:

Username

User’s home directory

Default login shell

Create the user account based on the information given above

If B or b is chosen, it must prompt for username of the account to be deleted, and

delete the user account as well as the user’s home directory

If C or c is chosen, it must prompt for username and group name that is added as a

supplementary group for the user account

If D or d is chosen, it must prompt for username and group name that is used as

the initial group for the user account, and change the initial group for the user

account.

If E or e is chosen, it must prompt for the username and shell name, and change

the default shell for the user account.

If F or f is chosen, it must prompt for username and expiration date, and change

the expiration date for the user account.

If Q or q is chosen the script must end.

9. The script should sleep for 3 seconds after each menu item is selected, before the loop

causes the menu to be redisplayed

10. Below is a sample of a while loop:

choice=n #initialize to dummy value

while [ "$choice" != "Q" ] && [ "$choice" != "q" ]

do

clear

echo -e "Choice:\c"

read choice

echo "You Entered $choice"

sleep 3

done