#include <iostream>
#include <unistd.h>
#include <fcntl.h>
 
using namespace std;
 
int main()
{
  //First, we're going to open a file
  int file = open("myfile.txt", O_APPEND | O_WRONLY);
  if(file < 0)    return 1;
 
  //Now we redirect standard output to the file using dup2
  if(dup2(file,1) < 0)    return 1;
 
  //Now standard out has been redirected, we can write to
  // the file
  cout << "This will print in myfile.txt" << endl; 
 
  //At the end the file has to be closed:
  close(file);
 
  return 0;
}//end of function main