Conventions

In this book, you will find a number of text styles that distinguish among 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, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "We will use the following wget command to download the source."

A block of code/SQL at psql prompt as well as the output from the server at psql is set as follows:

CREATE TABLE emp(id serial, first_name varchar(50));

Commands executed at shell/command prompt, the output, and parameters and settings are formatted as follows:

[root@MyCentOS ~]# ps f -U postgres
  PID TTY      STAT   TIME COMMAND
 1918 tty1     S      0:00 /usr/local/pgsql/bin/postgres

New terms and important words are shown in bold.

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.