this post was submitted on 22 Sep 2024
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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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sysV is the init system linux distributions used before systemd, openrc, upstart, runit, smf etc. It’s pretty much the old daddy and comes from Linux unix roots. Even MacOS used it before they made their own called launchd.
S6 sounds like a update to it since the capital V in sysv stands for the Roman numeral 5.
To be exact, OpenRC was developed to be run on top of sysV init, and still can be. (Many distros had their own "on top of sysV" things, but most of them stopped being maintained as systemd became common. OpenRC started its life as Gentoo's "on top of sysV", but was then cleaned up and made distro-agnostic.)
s6 is apparently a daemontools-like process supervisor that can be run as an init or in company with some other init.
Gentoo's comparison of init systems lists Artix as the preferred service file supplier for s6 (although that may be outdated), so I expect it is or was used extensively by that distro.