This guide is for people who need to work on different UNIX/Linux systems. To use just select the chapter, command or keyword you want to read about and go to that section. I do not leave out any topics, commands or options. Practical day-to-day tasks touch all aspects of UNIX/Linux. I made it my goal to cover them all. You can literally take this guide, read it in minutes and start working on any UNIX/Linux system.