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Does anyone know why all the .bom files in /Library/Receipts moved to /var/db/receipts?

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The short, simple answer is that someone at Apple decided that this should be done, and it was done. This is often referred to as an implementation detail, though. Is there a problem you're trying to solve? – bneely Dec 11 '11 at 7:38
The man page is lame though. man 5 bom still says "The bill of materials for installed packages are found within the package receipts located in /Library/Receipts" even on OS X 10.9.5. – 4ae1e1 Oct 25 '14 at 20:18
up vote 3 down vote accepted

first, /var/db on unix is the location for stuff like that.
second, it's much easier to type as it is in lower case.

so, not so unreasonable decision by apple's engineers.

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/var is hidden and thus harder to get to. Apple has hidden ~/Library from the common user for the same reason, makes it harder to foul thing up.

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