#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>

static char *str1 = "OP1\n";

int main()
{
  int f1, f2;

  close(STDOUT_FILENO);  
  f1 = open ("myjunk", O_RDWR | O_CREAT | O_TRUNC, 0777);
  close(STDERR_FILENO);
  f2 = dup(f1);
  printf("print to standard output!!!, f1 = %d\n", f1); // fflush(0); 
  fprintf(stderr, "print to standard error!!!\n"); // fflush(0); 
  write(f1, str1, strlen(str1)); // fflush(0);
  
  close(f1);  // close f1. now fid 1 is available 
  close(f2);
  open("/dev/tty", O_WRONLY); // open tty, relink fid 1 to tty 
  printf("This is a test\n");	// before this printf
  // another two printfs will also be performed (to tty). 

  return 0;
}