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

int main (int argc, char *argv[])
{
  int rank, size;
  int ret;

  MPI_Init (&argc, &argv);
  MPI_Comm_rank (MPI_COMM_WORLD, &rank);
  MPI_Comm_size (MPI_COMM_WORLD, &size);
  if(rank == 0) {
   ret = system("echo calling system");
  }
  printf( "Hello world from process %d of %d\n", rank, size );
  MPI_Finalize();
  return 0;
}