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38. Starting, Stopping, and Killing Processes

What's in This Chapter
fork and exec
Managing Processes: Overall Concepts
The ps Command
The Controlling Terminal
Why ps Prints Some Commands in Parentheses
What Are Signals?
Killing Foreground Jobs
Destroying Processes with kill
Printer Queue Watcher: A Restartable Daemon Shell Script
Killing All Your Processes
Interactively Kill Processes Matching a Pattern
Processes Out of Control? Just STOP Them
Cleaning Up an Unkillable Process
Why You Can't Kill a Zombie
Automatically Kill Background Processes on Logout in csh

38.1 What's in This Chapter

We've already talked about so many of the topics in this chapter, here or there, that it may seem like a real hodgepodge. It's a grab-bag of important things to know about processes - which you can think of as programs that are actually running, rather than sitting on the disk somewhere.

The chapter starts out with a couple of conceptual articles. They define some important terms that you're likely to encounter in this chapter.

Then we talk about the ps command, which tells you what processes you have running and just what they are up to (articles 38.5, 38.6, 38.7).

The next few articles cover signals, which are one way processes communicate with one another. We cover topics like:

We go from there to a more general discussion of ways to kill processes:


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