procedure ExecConsoleApp(CommandLine: AnsiString; Output: TStringList; Errors:
  TStringList);
var
  sa: TSECURITYATTRIBUTES;
  si: TSTARTUPINFO;
  pi: TPROCESSINFORMATION;
  hPipeOutputRead: THANDLE;
  hPipeOutputWrite: THANDLE;
  hPipeErrorsRead: THANDLE;
  hPipeErrorsWrite: THANDLE;
  Res, bTest: Boolean;
  env: array[0..100] of Char;
  szBuffer: array[0..256] of Char;
  dwNumberOfBytesRead: DWORD;
  Stream: TMemoryStream;
begin
  sa.nLength := sizeof(sa);
  sa.bInheritHandle := true;
  sa.lpSecurityDescriptor := nil;
  CreatePipe(hPipeOutputRead, hPipeOutputWrite, @sa, 0);
  CreatePipe(hPipeErrorsRead, hPipeErrorsWrite, @sa, 0);
  ZeroMemory(@env, SizeOf(env));
  ZeroMemory(@si, SizeOf(si));
  ZeroMemory(@pi, SizeOf(pi));
  si.cb := SizeOf(si);
  si.dwFlags := STARTF_USESHOWWINDOW or STARTF_USESTDHANDLES;
  si.wShowWindow := SW_HIDE;
  si.hStdInput := 0;
  si.hStdOutput := hPipeOutputWrite;
  si.hStdError := hPipeErrorsWrite;

  (* Remember that if you want to execute an app with no parameters you nil the
     second parameter and use the first, you can also leave it as is with no
     problems.                                                                 *)
  Res := CreateProcess(nil, pchar(CommandLine), nil, nil, true,
    CREATE_NEW_CONSOLE or NORMAL_PRIORITY_CLASS, @env, nil, si, pi);

  // Procedure will exit if CreateProcess fail
  if not Res then
  begin
    CloseHandle(hPipeOutputRead);
    CloseHandle(hPipeOutputWrite);
    CloseHandle(hPipeErrorsRead);
    CloseHandle(hPipeErrorsWrite);
    Exit;
  end;
  CloseHandle(hPipeOutputWrite);
  CloseHandle(hPipeErrorsWrite);

  //Read output pipe
  Stream := TMemoryStream.Create;
  try
    while true do
    begin
      bTest := ReadFile(hPipeOutputRead, szBuffer, 256, dwNumberOfBytesRead,
        nil);
      if not bTest then
      begin
        break;
      end;
      Stream.Write(szBuffer, dwNumberOfBytesRead);
    end;
    Stream.Position := 0;
    Output.LoadFromStream(Stream);
  finally
    Stream.Free;
  end;

  //Read error pipe
  Stream := TMemoryStream.Create;
  try
    while true do
    begin
      bTest := ReadFile(hPipeErrorsRead, szBuffer, 256, dwNumberOfBytesRead,
        nil);
      if not bTest then
      begin
        break;
      end;
      Stream.Write(szBuffer, dwNumberOfBytesRead);
    end;
    Stream.Position := 0;
    Errors.LoadFromStream(Stream);
  finally
    Stream.Free;
  end;

  WaitForSingleObject(pi.hProcess, INFINITE);
  CloseHandle(pi.hProcess);
  CloseHandle(hPipeOutputRead);
  CloseHandle(hPipeErrorsRead);
end;

(* got it from yahoo groups, so no copyrights for this piece :p and and example
   of how to use it. put a button and a memo to a form.                      *)

procedure TForm1.Button1Click(Sender: TObject);
var
  OutP: TStringList;
  ErrorP: TStringList;
begin
  OutP := TStringList.Create;
  ErrorP := TstringList.Create;

  ExecConsoleApp('ping localhost', OutP, ErrorP);
  Memo1.Lines.Assign(OutP);

  OutP.Free;
  ErrorP.Free;
end;