$ cat command_menu
#!/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"
read -p "Enter a, b, c, or d: " answer
echo
#
case "$answer" in
	a)
		date
		;;
	b)
		who
		;;
	c)
		pwd
		;;
	d)
		ls
		;;
	*)
		echo "There is no selection: $answer"
		;;
esac