更新时间：2021-08-20 10:44:47
封面
版权页
Credits
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Support files eBooks discount offers and more
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Chapter 1. Getting Started and Working with Shell Scripting
Comparison of shells
Tasks done by shell
Working in shell
Learning basic Linux commands
Our first script – Hello World
Compiler and interpreter – difference in process
When not to use scripts
Various directories
Working more effectively with shell – basic commands
Working with permissions
Summary
Chapter 2. Drilling Deep into Process Management Job Control and Automation
Introducing process basics
Monitoring processes using ps
Process management
Process monitoring tools – top iostat and vmstat
Understanding "at"
Understanding "crontab"
Chapter 3. Using Text Processing and Filters in Your Scripts
Text filtering tools
IO redirection
Pattern matching with the vi editor
Pattern searching using grep
Chapter 4. Working with Commands
Learning shell interpretation of commands
Command substitution
Command separators
Logical operators
Pipes
Chapter 5. Exploring Expressions and Variables
Understanding variables
Working with environment variables
Working with read-only variables
Working with command line arguments (special variables set and shift getopt)
Understanding getopts
Understanding default parameters
Working with arrays
Chapter 6. Neat Tricks with Shell Scripting
Interactive Shell scripts – reading user input
The here document and the << operator
The here string and the <<< operator
File handling
Debugging
Chapter 7. Performing Arithmetic Operations in Shell Scripts
Using a command declare for arithmetic
Using the let command for arithmetic
Using the expr command for arithmetic
Binary octal and hex arithmetic operations
A floating-point arithmetic
Chapter 8. Automating Decision Making in Scripts
Checking the exit status of commands
Understanding the test command
Conditional constructs – if else
Switching case
Implementing simple menus with select
Looping with the for command
Exiting from the current loop iteration with the continue command
Exiting from a loop with a break
Working with the do while loop
Using until
Piping the output of a loop to a Linux command
Running loops in the background
The IFS and loops
Chapter 9. Working with Functions
Understanding functions
Passing arguments or parameters to functions
Sharing the data by many functions
Declaring local variables in functions
Returning information from functions
Running functions in the background
Creating a library of functions
Chapter 10. Using Advanced Functionality in Scripts
Understanding signals and traps
Using the trap command
Ignoring signals
Using traps in function
