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We use 810 versions of the Linux kernel, released over a period of 14 years, to characterize the system's evolution, using Lehman's laws of software evolution as a basis. We investigate different possible interpretations of these laws, as reflected by different metrics that can be used to quantify them. For example, system growth has traditionally been quantified using lines of code or number of functions, but functional growth of an operating system like Linux can also be quantified using thedoi:10.1016/j.jss.2009.09.042 fatcat:wicuoyslinesjpdsy6tgwtjb7e