It's impossible to be certain. I think it is a mistake, but a different one. Given the textual context I think the mistake is just to quote the perms as 0555 instead of 0444. If that one change were to be made then it would make good sense to me. Would you agree?

In reply to Re^5: How does rename() work on read-only files? by hippo
in thread How does rename() work on read-only files? by j41r

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