Table of Contents for
Linux Shell Scripting Bootcamp

Version ebook / Retour

Cover image for bash Cookbook, 2nd Edition Linux Shell Scripting Bootcamp by James Kent Lewis Published by Packt Publishing, 2017
  1. Cover
  2. Table of Contents
  3. Linux Shell Scripting Bootcamp
  4. Linux Shell Scripting Bootcamp
  5. Credits
  6. About the Author
  7. Acknowledgement
  8. About the Reviewer
  9. www.PacktPub.com
  10. Customer Feedback
  11. Preface
  12. What you need for this book
  13. Who this book is for
  14. Conventions
  15. Reader feedback
  16. Customer support
  17. 1. Getting Started with Shell Scripting
  18. Demonstrating the use of scripts
  19. Summary
  20. 2. Working with Variables
  21. Validating parameters using conditional statements
  22. Comparison operators for strings
  23. Environment variables
  24. Summary
  25. 3. Using Loops and the sleep Command
  26. Screen manipulation
  27. Indenting your code
  28. Using the for statement
  29. Leaving a loop early
  30. The sleep command
  31. Watching a process
  32. Creating numbered backup files
  33. Summary
  34. 4. Creating and Calling Subroutines
  35. File redirection
  36. Command piping
  37. Subroutines
  38. Using parameters
  39. Making a current backup of your work
  40. Summary
  41. 5. Creating Interactive Scripts
  42. Summary
  43. 6. Automating Tasks with Scripts
  44. Summary
  45. 7. Working with Files
  46. Reading files
  47. Reading and writing files
  48. Reading and writing files interactively
  49. File checksums
  50. File encryption
  51. Summary
  52. 8. Working with wget and curl
  53. wget and recursion
  54. wget options
  55. curl
  56. Summary
  57. 9. Debugging Scripts
  58. Automatic backups
  59. More syntax errors
  60. Logic errors
  61. Using set to debug scripts
  62. Summary
  63. 10. Scripting Best Practices
  64. ssh and scp
  65. Find and use a good text editor
  66. Environment variables and aliases
  67. ssh prompt
  68. Testing an archive
  69. Progress indicator
  70. Creating new commands from a template
  71. Alerting the user
  72. Summary
  73. Index

Preface

In Linux Shell Scripting Bootcamp, you will begin by learning the essentials of script creation. You will learn how to validate parameters and also how to check for the existence of files. Moving on, you will get well-versed with how variables work on a Linux system and how they relate to scripts. You'll also learn how to create and call subroutines and create interactive scripts. Finally, you will learn how to debug scripts and scripting best practices, which will enable you to write a great code every time! By the end of the book you will be able to write shell scripts that can dig data from the Web and process it efficiently.

What this book covers

Chapter 1, Getting Started with Shell Scripting, begins with the basics of script design. How to make a script executable is shown as is creating an informative Usage message. The importance of return codes is also covered with the use and validation of parameters.

Chapter 2, Working with Variables, discusses how to declare and use both environment and local variables. We also speak about how math is performed and how to work with arrays.

Chapter 3, Using Loops and the sleep Command, introduces the use of loops to perform iterative operations. It also shows how to create a delay in a script. The reader will also learn how to use loops and the sleep command in a script.

Chapter 4, Creating and Calling Subroutines, starts with some very simple scripts and then proceeds to cover some simple subroutines that take parameters.

Chapter 5, Creating Interactive Scripts, explains the use of the read built-in command to query the keyboard. Further, we explore some of the different options to read and also cover the use of traps.

Chapter 6, Automating Tasks with Scripts, describes the creation of scripts to automate a task. The proper way to use cron to run a script automatically at a specific time is covered. The archive commands zip and tar are also discussed for performing compressed backups.

Chapter 7, Working with Files, introduces the use of the redirection operator for writing out a file and use of read command for reading a file. Checksums and file encryption are also discussed, and a way to convert the contents of a file into a variable is also covered.

Chapter 8, Working with wget and curl, discusses the usage of wget and curl in scripts. Along with this, return codes are also discussed with a couple of example scripts.

Chapter 9, Debugging Scripts, explains some techniques to prevent common syntax and logic errors. A way to send output from a script to another terminal using the redirection operator was also discussed.

Chapter 10, Scripting Best Practices, discusses some practices and techniques that will help the reader create good code every time.