#!/bin/bash

# This command uses the break command to break-out of a
# while loop, thus terminating the menu as well as the
# script. Note the if statement used to allow for the break



num=1
until [ $num = 6 ]
do
	clear
	printf "\n\t\tMENU\n"
	printf "\t1. Add a File\n\t2. Change a File\n\t3. Delete a File\n"
	printf "\t4. Print a File\n\t5. Update Records\n\t6. Exit\n\n"
	printf "\tPlease make a selection >> "

# Notice how selection is read BEFORE error checking
	
	read num

# if statement to intiate break if one byte is used such as
# RETURN or CTRL-D instead of 2 bytes for a regular character

	if [ `echo $num | wc -c` = 1 ]
		then
			break
	fi

	while [ $num -lt 1 -o $num -gt 6 ]
	do
		echo
		echo -n "Invalid Number - Please Re-enter >>"
		read num
	done
done