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Why do you use the distro you use?
(lemmy.world)
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.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
NixOS is a declarative distro. Meaning it you can declare pretty much every aspect of it from what software is installed to how the system is configured from a config file.
Using your calandar example, you can list Thunderbird (or whatever) as a package you want in the configuration and it will be installed. You can also use that same configuration on another machine and produce the same environment.
Relevant to the original point, since all your software is listed in a text file, you can easily see exactly what's installed.