ioreg(8) on macOS
The text 2bf57043e3b9, as Mac OS X 10.1.5, Mac OS X 10.1.4, Mac OS X 10.1.3, Mac OS X 10.1.2, Mac OS X 10.1.1, Mac OS X 10.1, Mac OS X 10.0.4, Mac OS X 10.0 shipped it.
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Flags it lists
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-b -
-c -
-l -
-n -
-p -
-s -
-w