#!/bin/shecho "Is it morning? Please answer yes or no"read timeofdaycase "$timeofday" in    yes | y | Yes | YES )            echo "Good Morning"           echo "Up bright and early this morning?"           ;;    [nN]* )             echo "Good Afternoon"           ;;       * )               echo "Sorry, answer not recognised"           echo "Please answer yes or no"           exit 1           ;;esacexit 0