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Linux Command Line and Shell Scripting Bible

Linux Command Line and Shell Scripting Bible - Third Edition

By : Richard Blum, Christine Bresnahan
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Linux Command Line and Shell Scripting Bible

Linux Command Line and Shell Scripting Bible

By: Richard Blum, Christine Bresnahan

Overview of this book

The Linux command line enables you to type specific shell commands directly into the system to manipulate files and query system resources. Command line statements can be combined into short programs called shell scripts, a practice increasing in popularity due to its usefulness in automation. Linux is a robust system with tremendous potential, and Linux Command Line and Shell Scripting Bible opens the door to new possibilities. Linux Command Line and Shell Scripting Bible is your essential Linux guide. It contains new functional examples that are fully updated to align with the latest Linux features. Beginning with command line fundamentals, the book moves into shell scripting and shows you the practical application of commands in automating frequently performed functions. This book is a complete guide providing detailed instruction and expert advice working within this aspect of Linux. Whether used as a tutorial or as a quick reference, this book contains information that every Linux user should know.
Table of Contents (34 chapters)
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2
Part I: The Linux Command Line
13
Part II: Shell Scripting Basics
20
Part III: Advanced Shell Scripting
28
Part IV: Creating Practical Scripts
32
End User License Agreement
2
Appendix B: Quick Guide to sed and gawk

Summary

Shell script functions allow you to place script code that's repeated throughout the script in a single place. Instead of having to rewrite blocks of code, you can create a function containing the code block and then just reference the function name in your script. The bash shell jumps to the function code block whenever it sees the function name used in the script.

You can even create script functions that return values. This allows you to create functions that interact with the script, returning both numeric and character data. Script functions can return numeric data by using the exit status of the last command in the function or using the return command. The return command allows you to programmatically set the exit status of your function to a specific value based on the results of the function.

Functions can also return values using the standard echo statement. You can capture the output data using the backtick character as you would any other shell command. This enables...

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Tech Concepts
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Programming languages
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Linux Command Line and Shell Scripting Bible
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