feefifofibonacci.sh

#!/bin/bash

# https://unix.stackexchange.com/a/527714/347199

mkfifo mypipe
trap 'rm -f mypipe' EXIT

printf '%d\n%d\n' 0 1 >mypipe &

python3 -c '
number_phile = open(3, "w")
n = 50
b = int(input())
for _ in range(n):
    a, b = b, int(input())
    print(a + b, file=number_phile, flush=True)
print("F_{} = {}".format(n, b))' <mypipe 3>mypipe