Berkeley Software Distribution (BSD) Question:
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You are told that the permissions of a file are 645. Quick, how do you calculate what it means?


The permissions value are always 4 for read, 2 for write, 1 for execute. The three numbers are always for owner, group, and everybody on the system. Therefore 645 means: owner - read and write, group - read only, everybody - read and execute. You’ll rarely see such a permission set, but for interview question it might just work.

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