#!/bin/bash# menu interface to simple commandsecho -e "\n      COMMAND MENU\n"echo "  a.  Current date and time"echo "  b.  Users currently logged in"echo "  c.  Name of the working directory"echo -e "  d.  Contents of the working directory\n"echo -e "Enter a, b, c, or d:  \c"read answerechocase "$answer" in	a)		date		;;	b)		who		;;	c)		pwd		;;	d)		ls		;;	*)		echo "There is no selection: $answer"		;;esac