[Pipe] read command by using pipe

Code

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>

int main()
{
    FILE *write_fp;
    char buffer[BUFSIZ + 1];

    sprintf(buffer, "Once upon a time, there was...\n");
    write_fp = popen("od -c", "w");
    if (write_fp != NULL) {
        fwrite(buffer, sizeof(char), strlen(buffer), write_fp);
        pclose(write_fp);
        exit(EXIT_SUCCESS);
    }
    exit(EXIT_FAILURE);
}

Result

0000000   O   n   c   e       u   p   o   n       a       t   i   m   e
0000020   ,       t   h   e   r   e       w   a   s   .   .   .  \n
0000037