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I really don't want the Guest user on my computer even if it allows Find My Mac to work or whatever. Deleting Guest > Find My Mac for me.
I want to be unable to login to Guest with the only way to restore it being a complete reinstall of the OS.
I've tried 'rm -rf /Users/Guest', dscl . delete /Users/Guest, and tried putting random things into the Advanced Options for Guest under Users & Groups, but the Guest account still works.
I'm using FileVault so the Guest account is Safari only and requires a restart.
system prefs > users & groups > [unlock] >Guest User > uncheck Allow guests... No-one but another admin can reinstate that. Whatever else you try to do another admin could undo anyway. – Tetsujin – 2016-09-30T14:11:37.860
I'm the only admin so I'm looking for a way to permanently corrupt the account or otherwise make it inaccessible. That option only temporarily disables it. – blinkums – 2016-09-30T14:17:41.870
The FileVault Guest account runs from the Recovery Disk, not the main volume, so you'd have to go dig it out from there is you really want rid of your only way of tracking the machine should it be stolen... – Tetsujin – 2016-09-30T15:34:50.273