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

#include <sys/types.h>

int
main(int argc, char **argv)
{
  int tube[2];
  int pid;

  if (pipe (tube) < 0)
  {
    fprintf (stderr, "pipe error\n");
    return EXIT_FAILURE;
  }

  pid = fork ();
  switch (pid)
  {
    case -1:
      fprintf (stderr, "fork error\n");
      return EXIT_FAILURE;
      break;
    case 0:
      close (tube[0]);
      dup2 (tube[1], STDOUT_FILENO);
      execlp ("ls", "ls", "-lR", "/dev", NULL);
      break;
    default:
      close (tube[1]);
      dup2 (tube[0], STDIN_FILENO);
      execlp ("more", "more", NULL);
      break;
  }

  return EXIT_SUCCESS;
}