this post was submitted on 15 Apr 2026
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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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Yes, unstructured. Every script is its own special snowflake that does things a bit differently.
There's no guarantee of the verbs that the script implements. start, stop and restart are common, but the implementation is up to each individual script. I'm most familiar with Debian where some service (but not all) implemented it with
start-stop-daemon, but other distros and OSes handled it differently.Basic, commonly needed functionality, like restarting a crashed service after waiting for some delay, need to be implemented per app.
When sysvinit was widespread, there was a reason a lot of people used systems line supervisord to deploy services, rather than dealing with sysvinit scripts. It was a pain.
Systemd units were a logical progression from supervisord services.