macOS: install Oracle VirtualBox on macOS 10.13

Apple continuously enhanced the security of recent macOS versions and with High Sierra 10.13 it introduced a new feature that requires user approval before loading newly-installed third-party kernel extensions (KEXTs)

There are lots of complaints from users not being able to install applications with KEXT, like Oracle VirtualBox. The mechanism is relatively complex, but basically each developer is required to get a developer ID from Apple, and users can approve that software signed by that developer is allowed to run.
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macOS: S.M.A.R.T. status checks

Recently I was off for a few days, and before leaving, I shut down the machines, including the Mac Mini server, which has an external disk.

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macOS: com.apple.quarantine

I recently faced a weird behaviour from one of my Eclipse instances: all settings and plug-ins installed were forgotten, and the Eclipse looked like freshly installed.
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OS X: How to start the NFS daemon?

I recently reactivated my backup Mac Mini as a server; for convenience, I installed the OS X Server package.

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OS X: How to change an alias icon?

alias-iconI recently did some backup/restores and I noticed that the restored aliases, although fully functional, did not preserve the original icons.

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OS X: How to change the main screen?

DisplayIn multi-screen setups, for example a laptop with an external monitor, OS X prefers the laptop screen, which makes things a bit weird when using mainly the big screen, especially when having to confirm message boxes in the other screen.

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OS X: Time Machine backup after hardware repairs

TimeMachineCourtesy of Apple, my laptop suffered a brain surgery, and the main board was replaced. Now it is almost as good as new, but since it still has a history, I would like to preserve it.

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