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I often want to know where certain applications on my Mac store data. Often, I just ask on SuperUser, for example, "Where does Stickies save note data?" But, I'd like to know how to research the issue for myself.

What tools can I use to track which files an application changes, and at what times?

I know that I can use the System Profiler to see which files and ports an application has open, but I'd like a better solution. I'd like to be able to see real-time, or afterwards but with timestamps, each time an application writes to a file, and which files it's writing to.

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If this were a Windows question, I would've recommended RegShot in a heartbeat. I used to swear by that thing when I was doing PortableApps.com work. –  digitxp Aug 23 '11 at 1:37

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up vote 4 down vote accepted

Opensnoop in terminal seems pretty cool, see this article describing it.

enter image description here

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This is awesome! Thank you! –  stalepretzel Aug 23 '11 at 5:21

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