update.sh

#!/bin/bash

exit_status() {
    if [ $? -eq 0 ]
        then
                echo
                echo "-----------------------------------------"
                echo "*   Command Execution Was Successful.   *"
                echo "-----------------------------------------"
                echo
        else
                echo
                echo "-------------------------------------------------------"
                echo "     [Error] Process Command Execution Has Failed!     "
                echo "-------------------------------------------------------"
                echo

        read -p "The last command has exited with an error. Exit script? (yes/no)" answer
                if [ "$answer" == "yes" ]
                    then
                        exit 1
                fi 
    fi 
}

start() {
            echo
            echo "--------------------------------------------"
            echo "***>>> Upgrading The Operating System <<<***"
            echo "--------------------------------------------"
            echo
}

upgrade() {
            sudo apt update;
            exit_status

            sudo apt upgrade;
            exit_status
}

cleanUp() {
            sudo apt autoremove;
            exit_status
}

exitUpdate() {

            echo
            echo "-------------------------------------------------------"
            echo ">>>>   Operating System Update Has Been Completed  <<<<"
            echo "-------------------------------------------------------"
            echo
        exit
}

#calls the functions
start
upgrade
cleanUp
exitUpdate