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 full path is more concrete and hardcoded; the interpreter will try to use the complete path. For example, /bin/ls or /usr/local/bin/myBinary.."

A block of code is set as follows:

#!/bin/bash
AGE=17
if [ ${AGE} -lt 18 ]; then
    echo "You must be 18 or older to see this movie"
fi

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

rbrash@moon:~$ history
1002 ls
1003 cd ../
1004 pwd
1005 whoami
1006 history

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.