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Trapping signals as Chubler_XL noted would be a good idea.

But when you set new's login shell to a shell script rather than anything new's .profile, it's a noninteractive shell -- nothing to break...

Sounds like a good project to me. I've considered such a thing but I'm having a hard time striking a balance between giving people sufficient access and preventing them from setting up botnets etc...

I'm hoping you mean 'hacker' in the good sense. I know, I know -- corruption of a perfectly good term, but that's something beyond our control.

If you don't have sudo installed, install it,...

This migh be a good start, but you probably want to research what login does (eg running /etc/profile and the like).

#!/bin/bash
trap 'exit 0' 1 2 3 15
printf "Username: "
read touser
trap -...