Fibonacci Series Program in Shell script

 

#!/bin/bash

echo "Enter the number"

read n

a=0;b=1

echo $a

echo $b

#c=$(($a+$b))

while [ `expr $a + $b` -le $n ]            or             while [ `expr $((a+b))` -le $n ]

do

   c=`expr $a + $b`                              or            c=$((a+b))

echo $c

a=$b

b=$c

done

using For loop

#!/bin/bash

# Program for Fibonacci

# Series

# Static input fo N

# N=6

echo enter number:

read N

# First Number of the

# Fibonacci Series

a=0

# Second Number of the

# Fibonacci Series

b=1

echo "The Fibonacci series is : "

for (( i=0; i<N; i++ ))

do

        echo  "$a"

        fn=$((a + b))

        a=$b

        b=$fn

done

# End of for loop