Basic Bash menu

menuapp.sh

#!/bin/bash

readonly RED='\033[0;41;30m'
readonly STD='\033[0;0;39m'

function show_menu()
{
	clear

	echo ""
	echo "Title here"
	echo "----------------------------"
	echo "1. Do something"
	echo "2. Do something else"
	echo "3. Close this program"
	echo "----------------------------"
}

function read_option()
{
	local choice
	read -p "Enter choice: " choice </dev/tty
	case $choice in
		1) function1 ;;
		2) function2 ;;
		3) exit ;;
		*) echo -e "${RED}Bad choice...${STD}" && sleep 2
	esac
}

main() {
	while true
	do
		show_menu
		read_option
	done
}

main