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like so
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sudo su otheruseris thatsuallows the root to switch into any users without entering their password, while non-root users that runssuhave to input the target user's password.sudo sutherefore runssuas root, which allows you to get a shell for another user without knowing their password (as long as it's allowed by sudoers).sudo passwd(first provide your user password, then choose a new root password).ps aux).