During work in the system Linux it is impossible to do without works in a terminal with a command line. A command line allows to use all power and flexibility of the system Linux. As a rule, a novice or experience user causes the pages of reference guide, however, it is very large, besides, as a rule, in English language. To this book many enough examples of the use of commands of Linux are driven, a wide spectrum is thus used commands and it is not necessary to search in different reference books. An user is enough to choose a necessary example and apply it to the terms.