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That’s why su also stands for substitute user or switch user. Simply type su followed by the user account name, e.g., sudo fossbytes, and you’ll enter the password for fossbytes. After completing the job, you can exit the root shell by typing exit. Overall, su basically starts another shell instance with the privileges of the intended user.
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sudo -i means elevate to root as though it is a new connection. in this case pwd will reflect /root and whoami will report root.
sudo -s means elevate to root. in this case pwd will reflect the path where you were prior to running this comamnd. whoami will report that you are now root.
to switch to another user
sudo -i -u newuser pwd /home/newuser whoami newuser
sudo -s -u newuser pwd same place you were when you ran the command. whoami newuser.
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