824
Linux Desktop Market share keeps increasing, 3.19% now. +0.07% for August
(gs.statcounter.com)
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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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At that rate market share will double after about four years. Since it took a hell of a lot more than four years to get to this point then that means that growth is accelerating.