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Parameters You Must Type as Shown
If you need to type a parameter as shown, it appears following the command in the same font. For example,
$ doit
To use the command in the above example, type the entire line as shown.
Parameter Values You Provide
If you need to supply a value, its placeholder is underlined and has a name that indicates what you need to provide. For example,
$ doit
In the above example, you need to replace hh with the hour and mm with the minute, as shown in the previous example.
Optional Parameters
If a parameter is available but not required, it appears in square brackets. For example,
$ doit
To use the command in the above example, type either doit or doit
Alternative Parameters
If you need to type one of a number of parameters, they’re separated by a vertical line and grouped within parentheses ( ). For example,
$ doit
To perform the command, you must type either doit
Default Settings
Descriptions of server settings usually include the default value for each setting. When this default value depends on other choices you’ve made (such as the name or IP address of your server, for example), it’s enclosed in angle brackets <>.
For example, the default value for the IMAP mail server is the host name of your server. This is indicated by mail:imap:servername = "<hostname>".
Commands Requiring Root Privileges
Throughout this guide, commands that require root privileges begin with sudo.
Preface About This Book