// Put it all together.  Use fork, pipe, exec, and cout!
#include <iostream>
#include <unistd.h>

using namespace std;

int main(void) {
  int i;
  int p[2]; //our pipe
  int pid;
  
  //create the pipe
  pipe(p);

  //fork the process
  pid = fork();
  if(pid) {
    //use the write side of the pipe as stdout
    dup2(p[1], STDOUT_FILENO);
    close(p[0]);

    //count to 1000
    for(i=0; i < 1000; i++)
      cout << i << endl;
  } else {
    //use the read side of the pipe as stdin
    dup2(p[0], STDIN_FILENO);
    close(p[1]);

    //run less
    execlp("cat", "cat");
  }
  return 0;
}