Process Restriction in Debian

Hi! I'm wondering how to restrict processes via command line in Debian, hence the title and subject. Though unconventional, I'm creating a script(s) for security purposes so any suggestions would be helpful. I'm looking to suspend, if not terminate any non-critical processes minus the terminal. These processes would then be un-suspended/reopened via, once again, the terminal. How would this work? Thank you!

Edit: Essentially I would be regulating the processing by killing non-whitelisted ones and then preventing them from opening. How would I create this script, which processes should I whitelist (for Debian), and how could I reverse this?
 
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