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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

Understanding how the bash shell handles input and output can come in handy when creating your scripts. You can manipulate both how the script receives data and how it displays data, to customize your script for any environment. You can redirect the input of a script from the standard input (STDIN) to any file on the system. You can also redirect the output of the script from the standard output (STDOUT) to any file on the system.

Besides the STDOUT, you can redirect any error messages your script generates by redirecting the STDERR output. This is accomplished by redirecting the file descriptor associated with the STDERR output, which is file descriptor 2. You can redirect STDERR output to the same file as the STDOUT output or to a completely separate file. This enables you to separate normal script messages from any error messages generated by the script.

The bash shell allows you to create your own file descriptors for use in your scripts. You can create file descriptors 3...

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Tech Concepts
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Programming languages
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