#! /usr/bin/perl -w
  use strict;
  use IPC::Open2;

  my $reader;
  my $writer;
  my $pid = open2 ($reader, $writer, './one.pl');

  print scalar <$reader>;
  print scalar <$reader>;
  print $writer "Some input.\n";
  print scalar <$reader>;
  print scalar <$reader>;

  close $reader;
  close $writer;
  exit 0;