UNIX

Made in 1971

UNIX was a platform for programmers developing software to be run on it

UNIX is still being used today

Majority written in C

UNIX was invented by Ken Thompson

Could be changed by anyone

Three main parts of an OS: Kernel Shell and the programs/applications

The Unix environment and the client–server program model were essential components in the development of the internet

Predecessor of Linux

Refrences

https://en.wikipedia.org/wiki/Ken_Thompson
https://en.wikipedia.org/wiki/Unix