August 2021
Intermediate to advanced
542 pages
11h 16m
English
Content preview from Linux Cookbook, 2nd Edition
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Chapter 3. Starting, Stopping, Restarting, and Putting Linux into Sleep Modes
In this chapter you will learn several ways to stop, start, and restart a Linux system, and how to manage sleep modes. You will learn both the legacy commands and the new systemd commands.
You will also learn how to set up automated startups and shutdowns. An automated shutdown is nice to remind you to stop working, and you don’t have to remember to shut off your computer for the night. You can set up automated wake-ups and shutdowns on a remote machine, so that you can access it during work hours without leaving it running all the time. If your users are watt wasters who don’t shut off their computers, you can configure them to shut down during off hours.
The “three-key salute,” Ctrl-Alt-Delete, is useful when you need to interrupt a startup and reboot, or reboot when a process or application is misbehaving. In graphical desktops you can remap the keys to a more convenient key combination.
There are a number of legacy shutdown commands that have accumulated over the decades, with a lot of overlapping functionality: shutdown, halt, poweroff, and reboot. The shutdown command provides the useful options of timed shutdowns, with warnings to all logged-in users. These commands are useful in scripts, in SSH sessions, and anytime you are working from the command line.
Root Privileges Not Always Required
In olden times, root privileges were needed to run the shutdown commands. This is changing, and on many ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.