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As I can find in Mac OS X

smarek:~ marekseberaold$ dmesg
Unable to obtain kernel buffer: Operation not permitted
usage: sudo dmesg

Is this really important, to disable access to dmesg output for non-root / non-administrative users? Why is Apple doing this at all?

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Apparently, the need to run as root comes from the original BSD command. I think that modern FreeBSD has abandoned the need for root dmesg. –  new123456 Jan 26 '12 at 12:15

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