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: "The nslookup utility is available on Linux, Windows, and macOS."

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

nslookup packtpub.com 8.8.4.4

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: "Navigate to System | Advanced. Make sure the Admin Access tab is selected and scroll down to the Secure Shell section of the page."