Many functions in NodeJS have a Sync pendant to the non-blocking functions.
Why is there no blocking pendant in the child_process module?

I've giving up as I tried to iterate over a directory and call for every 
file
child.exec....

how should my app now, that every process completed his task?
I'm going to run in trouble, because to use a timer to check that seems to 
be not a powerful resolution.

Think there should be a sync pendant in the core child module....

Sometimes you're going to the "callback" hell...

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