dup2 usage

dup2_usage.c

// A simple example of how dup2 can be used

const char* msg = "Text written by standard file descriptor\n";
int fd = open("dup2_test.txt", O_RDWR | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
write(fd, msg, strlen(msg));

/* Map stdout to our file */    
dup2(fd, STDOUT_FILENO);
printf("Text written by dup @ stdout file descriptor\n");
close(fd);