The book provides first-year students in scientific subjects with a solid introduction to the Unix operating system and its practical applications. The reader receives a systematic and easily understandable entry into working with the Unix command line, enabling efficient use of Unix in the scientific field. Key topics are highlighted to allow beginners to quickly start working with the shell. Building on basic knowledge of the Microsoft Windows operating system, new concepts are developed with numerous examples and exercises, including detailed solutions. Core topics are initially addressed to enable the use of the Unix command line, including fundamental Unix commands, files and directories in Unix, and process control. This gives the reader the opportunity to fully engage with the material.