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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Around 2000 or so, I used to work in tech support for a software company who had like 5000 Windows-based customers and 5 running Solaris. My boss chose me to learn Solaris when the previous "expert" left. I bought this book and started hacking. Good times!
Oh yeah. I remember that book from college. Only like 100 pages or so, right?
About 260 if you don't count the function reference at the back. There sure wasn't much to it back then. Compared to the monster that is C++. I can maybe see why Linus doesn't like it and prefers C. There's a hundred different ways to do one thing, and it could get out of hand, and there's a lot of complex stuff in the libraries that you're dependent on. For low-level programming it's basically like "trust me, bro".
It's great for me though that can't program worth a shit and have all the algorithms ready to go.