#!/bin/bash

# this script return the fibonacci sequence for the input number

if [ $# -lt 1 ]
then
  # use default length
  limit=50
else
  # use argument
  limit=$1
fi

# seed the sequence
first=1
second=1

echo "Fibonacci sequence up to $limit"
echo $first
echo $second

while [ $second -lt $limit ]
do
  sum=$(( $first+$second ))
  echo $sum
  first=$second
  second=$sum
done