Linux reached the age of 23 this week, more or less. Linus Torvalds was working on a hobby operating system for 386(486) AT clones in 1991. He invited people to say what theyd like to see in it, but didnt promise hell implement them. He took numerous ideas from MINIX, a UNIX-like operating system written in the late 1980s by Andrew Tanenbaum of the Vrije Universiteit in Amsterdam. The bulk of the operating system, including the code for scheduling processes, understanding and accessing data on disk, is done inside the highly-privileged kernel.”]
Source: https://nakedsecurity.sophos.com/2014/08/27/linux-hits-23-the-time-machine-that-changed-the-world/