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Please explain briefly why repairing of permission is one of the maintenance tool for mac os x exclusively . Why it isn't done on windows?

  • You had two questions in here. This site works better when there is only one question per question. That way, it's easier for other people to find solutions if they have the same problem. I've edited out your second question, but feel free to ask it separately. – nohillside Feb 1 '15 at 9:20
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Only because OS X offers a convenient way to repair permissions shouldn't be taken as an indicator that other operating systems don't need similar functionality as well. At least in the Linux world it depends on the distribution whether something similar is available and how it is run (e.g. periodically via cron).

As for the "why is this required in the first place": Software is usually not bug-free, neither are Installer applications. So permissions may get changed in unexpected ways over time. Having a function to repair them may save a lot of time wasted for hunting such issues down.

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Windows does actually require equivalent permissions fixes, it's just that there is no built-in tool to do it all automatically.

Analogous processes such as sfc /scannow etc or any of the suite of tools from tweaking.com provide easier user access to those underlying system tools.

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