#!/bin/bash
# Scriptname: hour
hour=0
until (( hour > 24 ))
do
        case    "$hour" in
        [0-9]|1[0-1]) echo "Good morning!"
                ;;
        12) echo "lunch time."
                ;;
        1[3-7]) echo "Siesta time."
                ;;
        *) echo "Good night."
                ;;
        esac
        (( hour +=1 ))  # Don't forget to increment
				# the hour
done