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I just received my copy of Mac OS X and iOS Internals, and there is something a little strange:

Chapter 13: BS"D: The BSD Layer

Is there an explanation for the extra quote ?

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up vote 6 down vote accepted

it's not a typo. And it's not an allusion to Jewish roots, though the origin is Jewish. BS"D is yiddish for with the help of a greater power (as in, God). The idea in this chapter is that OS X goes to where it did with the help of a greater foundation, BSD's. It also ties in to "On the Shoulders of Giants", which is Chapter 3, which is the user-mode mirror image of that chapter.

All the chapters have double titles. Makes for a more interesting read :-)

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and check the book's news feed (newosxbook.com/rss.php) - The author clarified this personally there.. – Technologeeks Jan 22 '13 at 18:05
That's interesting. I had not noticed the double titles - but that's obvious when you look at the chapters titles sequentially. And somehow today I couldn't resist to buy "On the shoulders Giants" when I saw it. – alecail Jan 22 '13 at 18:29

BSD is an acronym for Berkeley Software Distribution and shouldn't carry the ". Probably a typo.

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