Have you actually looked at your own code?
If "comando" starts with "cd" you are calling start() twice.
And again, probably for the fifth, or sixth time now, you are doing it all wrong, each "cmd" call is independent of each other.
Aside from being a lie, as both account have posted in parallel over a couple of days, maybe, instead of wasting everyone's time, try to at least read some of the responses you get.
Like the one on the previous thread to that problem where someone suggested you just execute a script that does all these steps instead of your futile battle to hack around an unsolvable lack of understanding of how "cmd" works.
Your vector operations look fine.
Which of them do you have a problem with?
Cheers,
_






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