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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.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
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!
In polish we have an idiom for rare books that directly translates to 'white crow'. Incidentally French say 'merle blanc' - 'white blackbird'. French influenced polish a lot during late modernity. Anyway where was I.
Ah, yeah likely not very rare, they must have messed a whole print run and decided to sell it off anyway, maybe at a discount, since it's not a limited hardback illuminated Shakespeare's works in 5 tomes.
Then again... Weirder things have collection value.
White housefly in Portuguese.