Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, path names, dummy URLs, user input, and Twitter handles are shown as follows: "Shebang is a line on which #! is prefixed to the interpreter path."

A block of code is set as follows:

$> env 
PWD=/home/clif/ShellCookBook 
HOME=/home/clif 
SHELL=/bin/bash 
# ... And many more lines

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

$> env 
PWD=/home/clif/ShellCookBook 
HOME=/home/clif 
SHELL=/bin/bash 
# ... And many more lines

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

$ chmod a+x sample.sh

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "Select System info from the Administration panel."

Warnings or important notes appear in a box like this.

Tips and tricks appear like this.