【Linux】如何用shell编写斐波那契函数

代码如下

#!/bin/bash
echo "How many numbers do you want of Fibonacci series ?" 
  read total 
  x=0 
  y=1 
  i=2 
  echo "Fibonacci Series up to $total terms :: " 
  echo "$x" 
  echo "$y" 
  while [ $i -lt $total ] 
  do