Conventions and Abbreviations

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



An important note or instruction.

A warning about possible errors or important notes that require special attention.

Anti-virus network

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




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


Names of keyboard keys.


Names of files and folders, code examples.

Cross-references to document chapters or internal hyperlinks to webpages.

Command-line commands, entered using a keyboard (in the terminal or a 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.

List of abbreviations is in section Appendix G. List of Abbreviations.