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I created a new user and changed the ssh config. I forgot to add root permission to the newly created user.

Now I need to undo my changes in ssh config. Is that possible without any sudo command?

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Yes, by logging in as root. –  Daniel Beck Aug 24 '12 at 8:54
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If you have acess to the 'su' command, you can change to the root user without sudo permissions if you know the password of the root user. Use it like su root.

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