#!/bin/bash

#number=10

echo -n Please enter a positive  integer that is 15 or lower:

read number
# this checks that the number is NOT gt 15 or  (||) not less than 0
# see p. 365 Ch 10 for the logical operators
if [ $number -gt 15 ] || [ $number -lt 0 ]
	then 
		echo Hey this number NOT between 0 and 15!
		echo bye bye
		exit 1
	else
		echo OK it\'s less than 15 so we\'ll keep going
fi


echo the value of '$number' is $number 

while [ "$number" -ge 1 ]
	do
	echo $number
	sleep .1
	let number="$number-1"
	
done

echo the value has been decremented to 1 so the loop is over

#<title>CSC128: Shell Script Examples - while-do-done and let builtin   </title>