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

extern char **environ;

// simple example of redirecting stdout
int main(void) {

    int fd = open("message.txt", O_WRONLY | O_CREAT | O_TRUNC, 0666);
    if (fd < 0) {
        perror("");
        return 1;
    }
    
    if (dup2(fd, 1) < 0){
        perror("");
        return 1;
    }       
    // we won't use this really.
    // we will write to the file.txt via fd from now on 
    close(fd);
    
    char *echo_argv[] = {"/usr/bin/echo","My","lecturer","is","great!",NULL};

    execve("/usr/bin/echo", echo_argv, environ);    
    perror("");
    return 0;
}