If someone is remotely connected to my single ARM board computer with Debian 32-bit OS, (example: thru hijacking the browser), which connects through a firewall on a separate Orange Pi board, and I run shutdown, I have been told that the remote users/ hackers will “immediately” be disconnected from my computer and they can't see what I do before shutdown completes in the next 60 seconds.

1) In order for the first premise to ring true, do I need to be in admin “#”, for example: # shutdown ?
2) After reading more, it seems that by NOT including “-h” (shutdown -h now) it does not actually halt the system; it still allows the administrator to remain logged in as root. If I omit the -h, will the remote hackers still be disconnected immediately with just shutdown now?
3) If I type shutdown +90, will the remote hackers be disconnected immediately, and then for the next 90 minutes as well?

  • 2
    Do a fresh install of Fedora 30 Gnome or KDE, It's the most secure from the box getfedora.org OR spins.fedoraproject.org/en/kde – somethingSomething Jun 7 at 17:29
  • That means new Linux os for your computer – somethingSomething Jun 7 at 17:30
  • I'm not sure that original advice is correct (unless shutdown immediately disconnects the network interface and the remote users haven't done anything to automatically re-enable it). If you can add a link to where you heard that, you may be able to get better advice here. – drewbenn Jun 7 at 18:25
  • Thanks. The person who told me that actually writes for stackexchange :) I don't know if I should mention his name here, but he is an expert's expert. It's important realize that the 'malware' is not permanently on the OS, and that it disappears when I shutdown/ restart the desktop. My experience with this and these hackers is that once I restart the desktop, they are gone. But I am still curious about my 3 questions. Thanks. – sgu55 Jun 7 at 20:13
  • As others have already tried to tell you... reinstall your system! – Panki Jun 7 at 22:31

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