Shell Programming and Scripting

#!/bin/bash
#Filename: Assigntest Author: Luke Francis
quit=n
while [ "$quit" = "n" ]
do
clear
  echo "OPERATOR ADMINISTRATIVE TOOL"
   echo "1. User Information"
    echo "2. Network Connectivity"
    echo "3. Processes"
     echo "4. System Information"
      echo "5. Hardware Utilization"
       echo "Q. Quit"
       echo
        echo "Which option do you require?"

read menunumber
case $menunumber in
1)clear
    echo "USER INFORMATION"
     echo "1. Registered Users"
      echo "2. Disk Usage"
       echo "3. Last Logins"
        echo "4. Users Currently Logged In"
         echo "5. Total number of users"
          echo "Q. Quit"
          echo "Which option do you require?"

read menunumber2
case $menunumber2 in

        1)clear
          echo "The users registered on the system are:"
          echo
          awk -F: '{print $1}' /etc/passwd
          echo
          echo "Hit the Enter Key to continue"
          read junk;;
2)clear
          echo "Disk Usage is as follows:"
          echo
          du
          echo
          echo "Hit Enter Key to continue"
          read junk;;

        3)clear
          echo "Information on last noted login can be found next to each username."
          echo
          last
          echo
          echo "Hit Enter Key to continue"
          read junk;;

        4)clear
          echo "Users currently logged in are:"
          echo
          w
          echo
          echo "Hit Enter Key to continue"
          read junk;;

        5)clear
          echo "The total number of users are:"
          echo
          who -q
          echo
          echo "Hit Enter Key to continue"
          read junk;;

        Q|q)clear
          echo "Are you sure you want to quit? Y/N"
          read choice1
          case $choice1 in
               N|n)clear
                   echo "Hit Enter Key to continue"
read junk;;

               Y|y)quit=y;;
               *)clear
                 sleep 1;;
          esac
          ;;
        esac
;;
        Q|q)clear
          echo "Are you sure you want to quit? Y/N"
read choice2
case $choice2 in
        N|n)clear
            echo "Hit Enter key to continue"
                read junk;;

        Y|y)quit=y;;
        *)clear
           sleep 2;;
                esac
             ;;
                esac

read menunumber3
case $menunumber3 in

        2)clear
          echo "NETWORK CONNECTIVITY"
          echo
          echo "1. NIC Status"
          echo "2. Machine Availability"
          echo
          echo "Which option do you require?"

read menunumber4
case $menunumber4 in
1)clear
          echo "Information reagrding NIC status can be found below:"
          echo
          /sbin/ifconfig
          echo
          echo "Hit the Enter Key to continue"
          read junk;;

        2) clear
           echo "Available hosts and addresses are shown below:"
           echo
           cat /etc/hosts
           echo
           echo "Hit Enter Key to continue"
           read junk;;
        esac
       esac
done
clear
echo "Thank you for using the Operator Administrative Tool"