any tricks to make SHELL non blocking?

[hh]

> Klaus wrote:
> ... it WORKS, thanks a lot!

How could you doubt that!?  :-(
I never post things that I didn't test thoroughly, learned that from 'bn'.
In this case I looked into the script of my next Mac/Win/Linux/Raspi-stack "timeLapseCamera" which runs since four days without problems.
I have it running with up to 4 cheap USB-webcams at different repeat rates.
There is no blocking with my tests even if they fire all at the same full
second.