Hvorfor tillader Linux brugere at fjerne Root Directory?

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Video: Hvorfor tillader Linux brugere at fjerne Root Directory?

Video: Hvorfor tillader Linux brugere at fjerne Root Directory?
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Hvorfor tillader Linux brugere at fjerne Root Directory?
Hvorfor tillader Linux brugere at fjerne Root Directory?
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Det meste af tiden udfører ingen af os med vilje en handling, som bogstaveligt talt vil bryde vores operativsystemer og tvinge os til at geninstallere dem. Men hvad nu hvis en sådan handling let kunne ske selv ved et uheld på brugerens side? Dagens SuperUser Q & A-indlæg har svaret på en forvirret læsers spørgsmål.
Det meste af tiden udfører ingen af os med vilje en handling, som bogstaveligt talt vil bryde vores operativsystemer og tvinge os til at geninstallere dem. Men hvad nu hvis en sådan handling let kunne ske selv ved et uheld på brugerens side? Dagens SuperUser Q & A-indlæg har svaret på en forvirret læsers spørgsmål.

Dagens Spørgsmål & Svar session kommer til os med venlig hilsen af SuperUser-en underafdeling af Stack Exchange, en community-driven gruppe af Q & A-websteder.

Spørgsmålet

SuperUser læser fangxing ønsker at vide, hvorfor Linux vil tillade brugere at fjerne rodmappen:

When I installed Linux on my computer for the first time, I always liked to use root because I did not need to add sudo and enter my password every time I executed a command that needed root level permissions.

One day, I just wanted to remove a directory and ran rm -rf /, which “broke” my system. I have been wondering why Linux’s designers did not block such a dangerous command from being run so easily.

Hvorfor tillader Linux brugere at fjerne rodmappen?

Svaret

SuperUser bidragyder Ben N har svaret for os:

Why should it block you from doing whatever you want with your own computer? Logging in as root or using sudo is literally saying to the machine, “I know what I am doing.” Preventing people from doing dubious things usually also prevents them from doing clever things (as expressed by Raymond Chen).

Besides, there is one singularly good reason to allow a user to torch the root directory: decommissioning a computer by completely erasing the operating system and file system. (Danger! On some UEFI systems, rm -rf / can brick the physical machine too.) It is also a reasonable thing to do inside a chroot jail.

Apparently, people accidentally ran the command so much that a safety feature was added. rm -rf / does nothing on most systems unless –no-preserve-root is also supplied, and there is no way that you can type that by accident. That also helps guard against poorly-written but well-intentioned shell scripts.

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