December 2012
Intermediate to advanced
888 pages
48h 24m
English
Content preview from Ubuntu Unleashed 2013 Edition: Covering 12.10 and 13.04, Eighth EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Runlevel Definitions
The runlevels are defined in a traditional Linux system in /etc/init.d. Some distributions use the traditional /etc/inittab file to manage boot services. Ubuntu has not used this for several years since Upstart has been created and is used in the boot process, so by default the file does not exist. However, if you have used one in the past and want to create one in Ubuntu, it will be read and honored. Because it is not standard in Ubuntu, this book does not cover /etc/inittab.
Each runlevel tells the init command what services to start or stop. Although runlevels might all have custom definitions, Ubuntu has adopted some standards:
• Runlevel 0—Known as “halt,” this runlevel shuts down the system.
• Runlevel 1—This is a special ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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