- Learning Linux Shell Scripting
- Table of Contents
- Learning Linux Shell Scripting
- Credits
- About the Author
- Acknowledgments
- About the Reviewers
- www.PacktPub.com
- Preface
- 1. Getting Started and Working with Shell Scripting
- 2. Drilling Deep into Process Management, Job Control, and Automation
- 3. Using Text Processing and Filters in Your Scripts
- 4. Working with Commands
- 5. Exploring Expressions and Variables
- 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
- Summary
- 7. Performing Arithmetic Operations in Shell Scripts
- 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
- Summary
- 9. Working with Functions
- 10. Using Advanced Functionality in Scripts
- 11. System Startup and Customizing a Linux System
- 12. Pattern Matching and Regular Expressions with sed and awk
- The basics of regular expressions
- sed – noninteractive stream editor
- Understanding sed
- Understanding regular expression usage in sed
- Addressing in sed
- How to modify a file with sed
- Printing – the p command
- Deleting – the d command
- Substitution – the s command
- Range of selected lines: the comma
- Multiple edits – the e command
- Reading from files – the r command
- Writing to files – the w command
- Appending – the a command
- Inserting – the i command
- Changing – the c command
- Transform – the y command
- Quit – the q command
- Holding and getting – the h and g commands
- Holding and exchanging – the h and x commands
- sed scripting
- Using awk
- The meaning of awk
- Using awk
- Input from commands
- How awk works
- awk commands from within a file
- Records and fields
- Patterns and actions
- Regular expressions
- Writing the awk script file
- Using variables in awk
- Decision making using an if statement
- Using the for loop
- Using the while loop
- Using the do while loop
- Summary
- Index
In this chapter, you learned about variables and environment variables. You also learned about how to export environment variables, set, shift, read-only variables, command line arguments, and about creating and handling arrays.
In the next chapter, you will learn about debugging, the here operator, interactive Shell scripts for taking input from keyboard, and file handling.
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