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: "The Principal parameter is used within resource-based policies to identify the user, role, account, or federated user."

A block of code is set as follows:

{
 "Version": "2012-10-17",
 "Statement": {
   "Effect": "Allow",
   "Principal": {"AWS": "arn:aws:iam::356903128354:user/Stuart"},
   "Action": "sts:AssumeRole",
   "Condition": {"Bool": {"aws:MultiFactorAuthPresent": "true"}}
 }
}

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

[default]
exten => s,1,Dial(Zap/1|30)
exten => s,2,Voicemail(u100)
exten => s,102,Voicemail(b100)
exten => i,1,Voicemail(s0)

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

$ mkdir css
$ cd css

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 Route Tables from the menu on the left and click the blue Create Route Table button."

Warnings or important notes appear like this.

Tips and tricks appear like this.