#!/bin/bash

function add()
{
	#echo The first number was $1
	#echo The second number was $2
	ans=$[ $1 + $2 ];
	#echo Returning $ans
	echo $ans
}


function HomeAndStaff()
{
	if [ -d /home -a -d /staff ]; then
		return 0  # TRUE IS FALSE!!
	fi
	return 1
}



total=`add 3 2`
echo The total is $total

numPrograms=` ps aux | cut -c64-80 | sort | uniq | wc -l`
echo There are $numPrograms different programs running right now


if HomeAndStaff; then
    echo All is Good
else
    echo ALL is BAD
fi

# This does not work.  Can you figure out why?
function fib
{
	if [ $1 -lt 2 ]; then
		echo fib $1 is 1
		return 1
	else
		# compute fib(n-1)
		let minus1=$1-1
		fib $minus1
		let a1=$?

		# compute fib(n-2)
		let minus2=$1-2
		fib $minus2
		let a2=$? 

		let ans=$a1+$a2
		echo fib $1 is $ans  A1 is $a1 M1 is $minus1 A2 is $a2 M2 is $minus2
		return $ans
	fi
}
fib 4
echo $?