Conventions used

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

Code in text: 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: "For the WAN interface, type em0."

A block of code is set as follows:

end value: 1000
current states number: 750
start value: 500
(1000 – 750) / (1000 – 500) = 0,5

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

opnsense@ubuntu:~$ traceroute 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets
 1  _gateway (192.168.56.3)  2.277 ms  4.733 ms  4.707 ms
 2  10.0.2.2 (10.0.2.2)  4.685 ms  4.548 ms  4.512 ms
 3  * * *
 4  192.168.15.1 (192.168.15.1)  13.798 ms  14.349 ms  14.316 ms

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

$ bzip2 -d <filename>.bz2

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: "With VirtualBox installed and running, click on the New button."

Tips or Important Notes

Appear like this.