大多数时候，我们中没有人愿意执行一个会破坏我们的操作系统并迫使我们重新安装它们的操作。但是，如果这样的行为很容易发生，即使是用户的意外呢？今天的超级用户问答帖子回答了一个困惑读者的问题。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

问题

超级用户读者方兴想知道为什么Linux允许用户删除根目录：

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 permissi***.

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.

为什么Linux允许用户删除根目录？

答案

超级用户贡献者Ben N为我们提供了答案：

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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