The tasks that are performed from the command line of the Linux operating system are discussed. Explains how to get to the command line, work in the console, configure the system using programs that have only a text interface. Describes the features of the Linux file system, the most useful commands for working with text, the network and the Internet, as well as system administrator commands. Particular attention is paid to writing scripts for automating routine tasks in the languages ​ ​ of the bash and tcsh command shells. Methods of redirecting I/O, masks and pseudonyms, various options for launching programs, effective methods of using the keyboard, examples of complex commands and other issues are considered.