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sudoorsubecause it is your machine.fakeroothas two usages 1) it fools programs into believing you are indeed root user, which some badly written proprietary software may require even if not needed (usually Windows developer gone Linux) and 2) it allow emulating file mode and ownership changes which you wouldn't otherwise be able to do, mainly to create atarfile with correct permissions and ownership, useful for example when packaging software.fakeroot! If you can't think of a situation wherefakerootis useful, then you literally don't need it. But people who do in fact need it completely understand the use-case.