stdin/stdout and flush

[a11e99z]

On Tuesday, 27 August 2019 at 21:28:05 UTC, a11e99z wrote:
> On Tuesday, 27 August 2019 at 21:01:58 UTC, Andre Pany wrote:
>> On Tuesday, 27 August 2019 at 20:45:44 UTC, a11e99z wrote:
>>> On Tuesday, 27 August 2019 at 20:09:34 UTC, Andre Pany wrote:
>
> what result u expecting?
>
> then u send from "b" p.stdout.readln(); that is read as 2nd

its not sent, "b" just read from pipe
pipe closed and null (no data) come to "a"