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Can "grub-emu" make any changes to my system? I understand that the command "grub-emu" opens a GRUB emulator. However, since it loads the configuration files used by the "real" GRUB, I am a little concerned that this emulator may be able to harm my system.

Is it completely safe to experiment with CLI-mode commands in grub-emu?

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I always play around with things that remotely could cause my system to crash in a VM. As long as you don't start Firefox/OpenLibreOffice etc. you don't need much memory for that to work. You can reboot, while continue to work etc. –  Timo Jan 18 at 6:46

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