Where will the incident with the sudo command be reported to

In step 2 you copied the original hosts file to a backup location at ~/Documents/hosts-backup (i.e. in your documents folder).

All you should need to do is rename that file to hosts and then copy it to /private/etc/hosts (overwriting the edited file) to undo any damage that you may have done.

However if you only got to Step 3 you may not even have edited the file yet - in which case a reboot should be sufficient.

The system is asking for the password of your account and then verifies whether you are allowed to run sudo based on the content of /etc/sudoers. By default only Administrators (which have the option ticket in Preferences) are allowed to do this.

In case you want to run shell commands with sudo without having to switch users all the time you have several options:

• Use ssh <any-admin-user>@localhost to log in as an admin user and run sudo then
• Add your non-admin user to /etc/sudoers by logging in as an admin user, executing sudo visudo in Terminal, duplicating the %admin ALL=(ALL) ALL line and replacing %admin with your username. This will allow you to use sudo in Terminal without giving you full admin access. Using visudo instead of editing the file directly will ensure that the file gets checked for syntactical correctness on save (an error in /etc/sudoers might lock you out of your system completely)