The successful administration of UNIX systems requires a good understanding of general fundamentals and principles, without which all detailed knowledge ultimately remains disconnected and makes independent work more difficult. The authors provide a broad foundation in this practice-oriented work through a precise conveyance of knowledge, consistently presenting examples from various UNIX derivatives alongside the essential theoretical foundations. The aspiring system administrator gains the necessary overview, and the UNIX specialist will find valuable insights when it comes to lesser-known aspects. The book offers a comprehensive description of tools for system administrators, thus serving as a reliable working aid that aims to empower the reader to work independently and autonomously.