GetOutput
CHK(runner.GetOutput(&buffer) == B_OK);
CHK(runner.GetOutput(&buffer) == B_OK);
CHK(runner.GetOutput(&buffer) == B_OK);
CHK(runner.GetOutput(&buffer) == B_OK);
CHK(runner.GetOutput(&buffer) == B_OK);
status_t GetOutput(BString *buffer);
status_t GetOutput(BString *buffer);