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Linux Shell Scripting Essentials

Linux Shell Scripting Essentials

By : Sinny Kumari
4.5 (2)
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Linux Shell Scripting Essentials

Linux Shell Scripting Essentials

4.5 (2)
By: Sinny Kumari

Overview of this book

Shell scripting is a quick method to prototype complex applications or problems. Shell scripts are a collection of commands to automate tasks, usually those for which the user has a repeated need, when working on Linux-based systems. Using simple commands or a combination of them in a shell can solve complex problems easily. This book starts with the basics, including essential commands that can be executed on Linux systems to perform tasks within a few nanoseconds. You’ll learn to use outputs from commands and transform them to show the data you require. Discover how to write shell scripts easily, execute script files, debug, and handle errors. Next, you’ll explore environment variables in shell programming and learn how to customize them and add a new environment. Finally, the book walks you through processes and how these interact with your shell scripts, along with how to use scripts to automate tasks and how to embed other languages and execute them.
Table of Contents (10 chapters)
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9
Index

Process scheduling priorities


During a process lifetime, it may need CPU and other resources to keep executing normally. We know that multiple processes are running simultaneously in a system and they may need a CPU to complete an operation. To share the available CPUs and resources, process scheduling is done so that each process gets a chance to make use of the CPU. When a process gets created, an initial priority value is set. Depending upon the priority value, the process gets the CPU time.

The process scheduling priority range is from -20 to 19. This value is also called a nice value. The lower the nice value, the higher is the scheduling priority of a process. So, the process with -20 will have the highest scheduling priority and the process with the nice value 19 will have the lowest scheduling priority.

To see the nice value of a process, the ps or top command can be used. The corresponding nice value of a process is available in the NI column:

$ ps -l

In the ps output, we can see...

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