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guestwon't even have a shell to start, because/usr/binand/binare identical in many modern distros. (My gut feeling would be to try and put them in a chroot jail; it's possible thatsystemdeven gives you nice automatisms for that, like it does for services.)/var/emptyover/usr/binin a private filesystem namespace during login for the relevant user. Why do something that modifies the filesystem for everyone, when you can modify the filesystem only for the one user?