Conventions and Abbreviations

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The following symbols and text conventions are used in this guide:



Important note or instruction.

Warning about possible errors or important notes to which you should pay special attention.

Anti-virus network

A new term or an accent on a term in descriptions.




Names of buttons, windows, menu items and other program interface elements.


Keyboard keys names.


Names of files and folders, code examples.

Cross-references on the document chapters or internal hyperlinks to web pages.

Command-line commands, which are entered via a keyboard (in the terminal or terminal emulator), are marked with the command prompt character $ or # in the current manual. The character indicates the privileges required for execution of the specified command. According to the standard convention for UNIX-based systems

$—indicates that the command can be executed with user rights.

#—indicates that the command can be executed with superuser (usually root) privileges. To elevate the privileges, use su and sudo commands.