The first Linux 2.6 kernel was developed using the bitkeeper (BK) source code management tool, but for the last 10 years, ever since the Linux 2.6.12 release in June of 2005 Linux developers have been using Git.
“During all of the BK years we only got 65k commits,” Torvalds wrote. “Of course, we only used BK for three years, and we’ve now been on git for almost exactly ten years, but still – it shows how the whole development process has really sped up a _lot_.”
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