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Content introduction

Shell scripting (scripting) techniques are never out of date: they allow UNIX to reach its true potential. For uNIx users and system managers, writing shell scripts is a must, which allows you to quickly control and customize the powerful functions of any UNIX system. With Shell scripts, you can combine basic UNIX text and file processing commands to digest data and automate repetitive work. Once you have a good command of Shell scripting, these techniques will be very helpful to you over the next few years.

Writing shell scripts requires not only knowledge of the shell language, but also familiarity with individual uNIx programs: you must know why each program is there and how to use it or combine it with other programs. This book will tell you about the mainstream tools of UNIX. In addition, this book will also help you resolve the differences between UNIX commands and standards.

The author is familiar with the subtle differences in the basic skills and operations used by UNIx programs. They will not only tell you how to build a great script, but also teach you how to avoid falling into the trap of falling short of your success. With this book, you can save a lot of energy.

Not only do we need to learn how to write useful Shell scripts, but you also need to know how to quickly and truly customize Shell to optimize program portability and get rid of system-specific dependencies. These skills are important to anyone who operates and maintains UNIX and Linux systems. The knowledge provided in this book will help you master basic Shell scripting skills.

Catalogue

Order

Preface

Chapter 1 background knowledge

1.1 A brief history of UNIX

1.2 principles of software tools

1.3 Summary

Chapter 2 getting started

2.1 differences between scripting languages and compiled languages

2.2 Why use Shell scripts

2.3 A simple script

2.4 self-sufficient script: # on the first line!

Basic elements of 2.5 Shell

2.6 access to parameters of the Shell script

2.7 simple execution tracking

2.8 internationalization and localization

2.9 Summary

Chapter 3 find and replace

3.1 find text

3.2 regular expression

3.3 Field processing

3.4 Summary

Chapter 4 text processing tools

4.1 sort text

4.2 remove duplicates

4.3 reformat paragraphs

4.4 calculate the number of lines, words and characters

4.5 Printing

4.6 extract the first or last lines

4.7 Summary

Chapter 5 the Magic of pipes

5.1 extracting data from structured text files

5.2 structured data for Web

5.3 A good helper in solving puzzles

5.4 word list

5.5 list of tags

5.6 Summary

Chapter 6 variables, judgments, repetitive actions

6.1 variables and arithmetic

6.2 exit status

6.3 case statement

……

Chapter 7 input / output, File and Command execution

Chapter 8 generate script

Chapter 9 amazing performance of awk

Chapter 10 document processing

Chapter 11 extended example: merging user databases

Chapter 12 spell check

Chapter 13 process

Chapter 14 Shell portability issues and extensions

Chapter 15 secure Shell script: starting Point

Appendix A preparation of man pages

Appendix B documents and file systems

Appendix C important UNIX commands

Reference bibliography

Download address: shell script Learning Guide

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