int main(int argc, char* argv[]){


char* argument1[]={argv[1], NULL};
char* argument2[]={argv[2], NULL};
int fd[2];
int d;
pid_t pid;
char buffer[30];

if(argc < 3){
printf("No parameter");
return 1;
}

if(pipe(fd)==-1){
perror("pipe failed");
exit(1);
}

else{

   pid=fork();

   if(pid==0){
   /*child process*/
   close(1);
   dup(fd[1]);
   close(fd[0]);

   //close(fd[1]);

   execvp(argument1[0], argument1);

   }

   else if(pid>0){
   /*Parent process*/
   close(0);
   dup(fd[0]);
   close(fd[1]);

   //close(fd[0]);

   execvp(argument2[0], argument2);


   }

}


return 0;

}

int      m_pipe(char *cmd1, char *cmd2)
{
  int    fd[2];

  if (pipe(fd) == -1)
    {
      perror("Pipe failed ");
      return (-1);
    }
  if (fork() == 0)
    {
      /*Child process*/
      dup2(fd[0], 0);
      close(fd[1]);
      m_exec(cmd2);
    }
  else
    {
      /*Parent process*/
      dup2(fd[1], 1);
      close(fd[0]);
      m_exec(cmd1);
    }
  return (0);
}

int    main(int argc, char* argv[])
{
  if(argc != 3)
    {
      write(2, "Usage ./a.out cmd1 cmd2n", strlen("Usage ./a.out cmd1 cmd2n"));
      return EXIT_FAILURE;
    }
  if (m_pipe(argv[1], argv[2]) == -1)
    return EXIT_FAILURE;
  return EXIT_SUCCESS;
}