Question

I’m running a binary inside the bash script like to communicate with it… (the binary uses stdin, stdout)

#!/bin/bash
touch kacsa.txt
echo `./bbox 2`>>kacsa.txt
echo 2
echo 2
read -r KACSA >> kacsa.txt

I want to run bbox with option 2 and then give a simple input (2,2) after that reading in what was the output, and putting it in a text file (kacsa.txt) please help

example: I can run bbbox like this

>>./bbox 2   //it runs now
2          // it was written by
2          //it was written by me
4            // bbx write in console
I want to do the same thing with bash... the outup should goes tho an text file "kacsa.txt"

Answer 1

Try this:

#!/bin/bash
touch kacsa.txt
(echo 2 ; echo 2) | ./bbox 2 >> kacsa.txt

stdin of ./bbox is fed by the pipe.

stdout of ./bbox is put in the file.