A Very Short Introduction to Linux

Johann Mitloehner, 2014-20

  1. History and Basics
  2. The Shell
  3. Various Tools



There are many books on Unix and Linux, but the most revered classic remains:

The Unix Programming Environment, by Brian W. Kernighan and Rob Pike, Prentice Hall, 1984.

A used old edition is cheap and fine, and a very good read!