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Regarding ctime, some Unix versions(or I should say filesystems) really store the creation time(birthtime) of the inode. FreeBSD's find has the -Bmin switch for searching for true creation time.

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Can anyone link something about this? We have two contradictory opinions and I'm not sure who to believe. The Wikipedia article on ctime isn't at all helpful either:

http://en.wikipedia.org/wiki/Ctime

I really wasn't clear about what I wanted to say, sorry. birthtime is different from ctime on those systems. Ctime is last change on the inode as parent said.

I just wanted to note that some Unix systems really store the creation time. See http://www.daemon-systems.org/man/fstat.2.html for an example.

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