of=/dev/sda

fool@programming.dev to Programmer Humor@programming.dev – 541 points –
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.... but cd is a built-in

-1 accuracy point ( ◞ īš ◟)

linux 4.5-rc5 had efivarfs fixed to prevent "rm -rf /" bricking uefi motherboards -- so maybe someone can try it out? :]

It would be pretty useless if cd was a child process that changed its own directory, only to return to bash and be back where you started.