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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

Inter-process communication


A process alone can do a certain things, but not everything. It will be a very useful and good resource utilization if two or more processes can communicate with each other in the form of sharing results, sending or receiving messages, and so on. In a Linux or Unix-based operating system, two or more processes can communicate with each other using IPC.

IPC is the technique by which processes communicate with each other and are managed by kernel.

IPC is possible to do by any of the following ways:

  • Named pipes: These allow processes to read from and write into it.

  • Shared memory: This is created by one process and is further available for read from and write to this memory by multiple processes.

  • Message queue: This is a structured and an ordered list of memory segments where processes store or retrieve data in queue fashion.

  • Semaphores: This provides a synchronizing mechanism for processes that are accessing the same resource. It has counters that are used to control...

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