re-set password with crontab?

I want to re-set password (to the default one - DEMO) of some account every hour - using bash/linux on root. It would be easy but passwd login requires inteaction. How to make in automaticly happen?

one more thing. Is there a way to EMPTY directory with the shell commands? (I dont want to delete it and create, because of chown problems latter).

 

 

 

 

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