It's not the "command line of Linux". Hardly anything that a typical GNU/Linux user does in the command line has anything to do with the kernel, if anything at all. Standard POSIX commands are all GNU. apt-get, yum, etc are all package managers developed by separate groups. Skimming through that book, it looks to me like it focuses on GNU, all the while calling it "Linux", and even trying to justify calling it "Linux" at one point by saying that it's "unfair" to other programs.

That aside, there's a pretty good reason to reject this book: it's under a proprietary license that forbids derivative works and commercial use.

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