Question

In some cases, people who are not strong in Linux may need to run specific Linux commands. To make this easier, you can create a menu-driven program that runs these Linux commands. Such a program allows users to execute the commands without having to actually know about how to execute them. For this scenario, create a menu-driven program that has the following options:

1. List users who are logged in (using the who command)
2. List system information (using the uname -v command)
3. List the five largest files in the current directory (using the ls -lS command)
4. List basic CPU information (using the lscpu | head command)
5. Display system time (using the date command)
6. Exit the program

The program should continue in a loop until the user chooses option 6. The program should also produce an error message if an invalid option is chosen.

Answer 1

!/bin/bash

options=("1- List users who are logged in (using the who command)" "2- List system information (using the uname -v command)" "3- List the five largest files in the current directory (using the ls -lS command)" "4- List basic CPU information (using the lscpu | head command)" "5- Display system time (using the date command)" "6- Exit the program")
select num in "${options[@]}"
do
        case $num in
                "1- List users who are logged in (using the who command)")
                        who
                        ;;
                "2- List system information (using the uname -v command)")
                        uname -v
                        ;;
                "3- List the five largest files in the current directory (using the ls -lS command)")
                        ls -lS
                        ;;
                "4- List basic CPU information (using the lscpu | head command)")
                        lscpu | head
                        ;;
                "5- Display system time (using the date command)")
                        date
                        ;;
                "6- Exit the program")
                        break
                        ;;
                *) echo "Invalid Option";;

        esac
done

Here is the script to the linux bash shell program

ttt.sh File Edit Search Options Help !/bin/bash options=("1. List users who are logged in (using the who command) "2- List system information (using th select num in "${options[@]}" do case $num in "1. List users who are logged in (using the who command)") who "2. List system information (using the uname - v command)") uname - V "3. List the five largest files in the current directory (using the ls -l command)") ls -ls "4- List basic CPU information (using the Iscpu | head command)") Iscpu head "5 - Display system time (using the date command)") date "6. Exit the program") break *) echo "Invalid Option"::|| esac done

Here is the executed program with screenshots:

root@kali: -/Desktop File Edit View Search Terminal Help root@kali:-/Desktop# chmod +777 ttt.sh root@kali:--/Desktop# chmod +x ttt.sh in using the who command) "2 List root@kali:-/Desktop./ttt.sh ./ttt.sh: line 1: !/bin/bash: No such file or directory 1) 1. List users who are logged in (using the who command) 2) 2- List system information (using the uname v command)ne who command") 3) 3- List the five largest files in the current directory (using the 1s -15 com mand) 4) 4- List basic CPU information (using the Iscpu head command) command)") 5) 5- Display system time (using the date command) 6) 6- Exit the program #7 | "3 - List the five largest files in the current directory (usi 15 15 "4- List basic CPU information (using the Iscpu | head comman

? 8 W. car File Edit View Search Terminal Help root@kali:-/Desktop# chmod +777 ttt.sh root@kali:-/Desktop# chmod +x ttt.sh root@kali:-/Desktop ./ttt.sh "Search Options Help ./ttt.sh: line 1: !/bin/bash: No such file or directory 1) 1. List users who are logged in (using the who command) 21 2 - List system information (using the uname -v command) are logged in (using the who command) "2 List system information (using th 3) 3- List the five largest files in the current directory (using the ls -15 command) 4) 4- List basic CPU information (using the Iscpu head command) 5) 5. Display system time (using the date command) 6) 6. Exit the program List users who are logged in (using the who command)") ttesh who Invalid Option #? 1 "2- List system information (using the uname -v command)") root tty2 2020-07-30 08:37 (:1) uname V #? 2 #1 SMP Debian 4.12.6-lkalin (2017-08-30) #? 3 "3 - List the five largest files in the current directory (using the ls -15 command)") ISIS total 48 -rw-r--r-. 1 root root 10240 Jul 26 06:46 hws.tar drwxr-xr-x 2 root root 4096 Jul 23 08:39 name List basic CPU information (using the Iscpu | head command)") -rwxrwxrwx 1 root root 905 Jul 30 10:49 ttt.sh Iscpu | head -rwxrwxrwx 1 root root 188 Jul 29 08:46 ddd.sh |-rwxrwxrwx 1 root root 110 Jul 26 08:39 ww.sh Display system time (using the date command)") -rw-r--r-- 1 root root 69 Jul 28 09:59 somefile.txtdate -rw-r--r-.1 root root 52 Jul 29 08:25 log.txt -rwxrwxrwx 1 root root 42 Jul 26 07:09 Ss.sh Exit the program") -rw-r--r-- 1 root root 35 Jul 26 09:50 yyy break -rwxrwxrwx 1 root root 10 Jul 26 07:31 working.txt -rw-r--r. 1 root root Jul 26 07:29 linuxtest3.txt valid Option": #? 4 Architecture: x86_64 esac CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(S): 4 On-line CPU(S) list: @-3 Thread(s) per core: Core(s) per socket: 4 Sarketis

• chmod +777 ttt.sh gives special permissions to the bash script which are read , write and execute.
• chmod +x ttt.shmakes the bash script executable.
• who command shows the users which are logged in.
• uname -v is used to display the system information
• ls -lS where ls lists the files in directory and -S sorts files by their size
• lscpu | head gives cpu information. Pipe command gives the output of one command to the other command. Here lscpu output is given to head where "head" prints the toop n number of data.
• date is used to print the present date.
• exit command or break command can be used to exit a program.

This menu driven program has 7 different scenarios in which all of them are assignet with respective values. Once the user gives that value, the respective command gets executed and the user is shown the output of that command.

The input number should range from 1-7. If the input is given other than these commands, the user is shown as Invalid Option.

PLESAE UPVOTE IF THIS HELPED YOU.
THANKS