Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "To see the runlevel at the shell in real time, we can use the runlevel command."

A block of code is set as follows:

while <condition>
do
          <command1>
          <command2 

Any command-line input or output is written as follows:

$[philip@localhost Desktop]$ who -r
run-level 5 2018-06-20 08:20 last=S
[philip@localhost Desktop]$ 

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Select System info from the Administration panel."