Shell Scripting - Rotating Progress Bar

The echo -e command is used to change the term color

echo -e "\E[40;32m\b\c"
#Changes the term color to green with black background

#!/bin/bash

function success_banner()

{
    echo -e "\E[40;32m\b\c"
    echo -e "[OK]"
    echo -e "\E[40;37m"

}

function progress_banner()
{
    echo ""
    echo "##############################################################"

    echo ""
    echo -e "Step: $1 \b\c"
}

function rotate_line(){

    INTERVAL=1
    timecount="0"
    while :
    do
        timecount=`expr $timecount + 1`

        case $timecount in
        "1")
                    echo -e "-\b\c"

                    sleep $INTERVAL
                    ;;
        "2")
                echo -e '\\'"\b\c"

                sleep $INTERVAL
                ;;
        "3")
                echo -e "|\b\c"

                sleep $INTERVAL
                ;;
        "4")
                echo -e "/\b\c"

                sleep $INTERVAL
                ;;
        *)
                timecount="0" # Reset the count to 0

        esac
    done
}

function start_rotation(){
    rotate_line &

}

function stop_rotation(){
    rotate_line_pid=$!
    kill -9 $rotate_line_pid

    echo -e "\b\b\b"
}

progress_banner Rotation_Bar_Started
start_rotation
sleep 5
stop_rotation
success_banner Ok