Conventions used in this document

The following typographic and usage conventions occur in this text:

Table 1. Typographic and usage conventions

Text typeMeaning
Quoted textQuotes from people, quoted computer output.
terminal view
Literal computer input and output captured from the terminal, usually rendered with a light grey background.
commandName of a command that can be entered on the command line.
VARIABLEName of a variable or pointer to content of a variable, as in $VARNAME.
optionOption to a command, as in the -a option to the ls command.
argumentArgument to a command, as in read man ls.

command options arguments

Command synopsis or general usage, on a separated line.
filenameName of a file or directory, for example Change to the /usr/bin directory.
KeyKeys to hit on the keyboard, such as type Q to quit.
ButtonGraphical button to click, like the OK button.
MenuChoiceChoice to select from a graphical menu, for instance: Select HelpAbout Mozilla in your browser.
TerminologyImportant term or concept: The Linux kernel is the heart of the system.
\
The backslash in a terminal view or command synopsis indicates an unfinished line. In other words, if you see a long command that is cut into multiple lines, \ means Don't press Enter yet!
See Chapter 1, Bash and Bash scriptslink to related subject within this guide.
The authorClickable link to an external web resource.