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#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <sys/types.h>intmain(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;}