Book Image

Linux Command Line and Shell Scripting Bible - Third Edition

By : Richard Blum, Christine Bresnahan
Book Image

Linux Command Line and Shell Scripting Bible - Third Edition

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)
Part I: The Linux Command Line
Part II: Shell Scripting Basics
Part III: Advanced Shell Scripting
Part IV: Creating Practical Scripts
End User License Agreement

Standardizing Options

When you create your shell script, obviously you're in control of what happens. It's completely up to you as to which letter options you select to use and how you select to use them.

However, a few letter options have achieved a somewhat standard meaning in the Linux world. If you leverage these options in your shell script, your scripts will be more user-friendly.

Table 14.1 shows some of the common meanings for command line options used in Linux.

Table 14.1 Common Linux Command Line Options

Option Description
-a Shows all objects
-c Produces a count
-d Specifies a directory
-e Expands an object
-f Specifies a file to read data from
-h Displays a help message for the command
-i Ignores text case
-l Produces a long format version of the output
-n Uses a non-interactive (batch) mode
-o Specifies an output file to redirect all output to
-q Runs in quiet mode
-r Processes directories and files recursively
-s Runs in silent mode...