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The visudo command is often times available as well. It won’t let you save a malformed sudoers file. Finding other footguns though is an exercise for the reader.

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It will however let you accidentally break "sudo su -" and happily tell you to go fuck yourself afterward.

sudo -s or sudo -i

That will not change sudo's attitude toward you once you've bungled the sudoers file.

visudo

No. Visudo will only stop you from making a malformed sudoers file not from deleting lines you don’t understand.

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