Write a unix program for Fibonacci?

Answer 1

fibo()

{

num=${1:-100}

n2=1

n1=0

while n=$(( $n1 + $n2 )); [ $n -le $num ]

do

printf "%d " "$n"

n1=$n2

n2=$n

done

echo

}

## The loop continues until the user enters a valid number

while :

do

printf "Enter a number: "

read number

case $number in

*[!0-9]* | "") printf "\a*** Invalid number ***\n" >&2 ;;

*) break ;;

esac

done

fibo "$number"

Answer 2

function fib() { local x y z n; x=1; for n in `seq 1 $1` ; do z=$((x+y)); echo -e "$n\t:\t$z"; x=$y; y=$z; done; }

fib 25