this post was submitted on 13 Sep 2023
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Linux
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From Wikipedia, the free encyclopedia
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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Hrm. Skim ahead if you already know some of this... So say you have a running program XYZ that loads libUseful.so to do useful things. Now you run some updates and libUseful.so gets replaced with the new version. Because of how files on Unix work, the old version still exists on the disk until XYZ closes it, but any new program will load the new version. So things generally "just work" when the system is updated in place, but on the rare occasion causes weird problems. Fedora (from the GUI) chooses to run updates during reboot to prevent the rare, weird problems. If you update from the command line, it just does them in place. Kernel updates always require a reboot to apply though.