https://www.geeksforgeeks.org/shell-scripting-dialog-boxes/
Shell Scripting – Dialog Boxes

- messg.sh : 

#!/bin/bash 
function DialogGen ()
{
    dialog --checklist 'checklist' 15 10 10 'potato'  5 'on'  'carrot' 2 'off' 'grape' 3 'on' 'cabbage; 4 'off' 
} 
DialogGen


- messg.sh : 

#!/bin/bash 
function DialogGen () {  
--msgbox "Hi geeks, hope everyone are enjoying GeeksForGeeks" 10 30 
} 
DialogGen 


etc