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Is slackware still widely used?
(lemm.ee)
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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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That would be the stable distribution, the current distribution which is the basis for the next release (now 15.1) was last updated today. It is also highly stable relative to other distributions including Arch so for I would recommend it to anyone with some knowledge of Linux.
Arch is great of course, and the Arch Wiki is one of the best general resources for Linux out there.