this post was submitted on 27 Jul 2023
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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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I also wonder about Nix and Guix. But I never seriously consider Gentoo.
Ubuntu configures AppArmor by default, Fedora sets up SELinux, openSUSE also sets up SELinux to some extent—most major distributions except Arch do it, because you're installing it yourself. I recommend looking into it. AppArmor and SELinux are essentially about preventing privilege escalation. Here's a good place to start: https://wiki.archlinux.org/title/Apparmor
SELinux is an absolute pain to understand and setup, so it's good that Fedora does it.