आज का प्रश्न और उत्तर सत्र हमारे पास सुपरयूसर की सौजन्य है - स्टैक एक्सचेंज का एक उपविभाग, क्यू एंड ए वेब साइट्स का एक समुदाय संचालित समूह।
प्रश्न
SuperUser रीडर fangxing जानना चाहता है क्यों लिनक्स उपयोगकर्ताओं को रूट निर्देशिका को हटाने की अनुमति देगा:
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.
लिनक्स उपयोगकर्ताओं को रूट निर्देशिका को हटाने की अनुमति क्यों देता है?
उत्तर
सुपरयूसर योगदानकर्ता बेन एन के पास हमारे लिए जवाब है:
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.
स्पष्टीकरण में जोड़ने के लिए कुछ है? टिप्पणियों में विचार व्यक्त करो। अन्य तकनीक-समझदार स्टैक एक्सचेंज उपयोगकर्ताओं से अधिक उत्तरों पढ़ना चाहते हैं? यहां पूर्ण चर्चा धागा देखें।
छवि क्रेडिट: विकिमीडिया कॉमन्स