Linux · sudo & Privilege Escalation

On a default Ubuntu system, someone tries to log in as root, then su -l root, then ssh -l root — all fail. Why, and what is the only way in?

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More in sudo & Privilege Escalation

After one successful sudo, you run several more sudo commands in a row and only the first asked for a password. What controls that window?

You run su to a user in a terminal, then type exit when done. Whose password does su prompt for, and how do you get back?

Someone runs su root, becomes root, but finds admin commands in /usr/sbin fail with command not found. What did they forget?

On a server with several admins, why is sudo preferred over sharing the root password, and whose password does each admin type?

sudo ls /etc > /etc/out.txt fails with a permission error even though sudo can read /etc. Why, and how do you fix it?

For a long series of admin commands, what does sudo -s give you over prefixing sudo to each one, and how do you leave it?

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