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

int main(void) {
    int fd = open("test.txt", O_CREAT | O_WRONLY);

    if(fd < 0) {
        printf("Error opening the file\n");
    }

    dup2(fd, 1);
    printf("Tester\n");

    close(fd);
}