2008版《精通Unix shell脚本编程》：自动化与系统管理实用指南

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"《精通Unix Shell脚本编程》(Wiley,第2版,2008)是一本由经验丰富的Unix专家Randal K. Michael编写的权威指南，旨在帮助读者深入理解并掌握shell脚本的编写技巧，以自动化日常的UNIX任务。本书特别关注了Bash、Bourne和Korn三种主要的shell环境。每一章都从一个实际的UNIX挑战开始，通过逐步解释基础语法，引导读者将这些概念转化为实用的shell脚本解决方案。作者在书中提供了一系列完整的shell脚本示例，每个脚本都配以详细的描述，让读者能够清晰地了解每部分的功能和用途。这本书不仅适合程序员和系统管理员，对于对Unix操作有深入了解的专业人士来说，也是构建监测特定系统事件和情况的工具的宝贵资源。该书的第二版更新了内容，确保读者能够跟上技术的发展，学习到最新的shell脚本编程技巧和最佳实践。书中涉及的主题广泛，包括但不限于脚本设计原则、变量管理、流程控制、函数定义、错误处理以及如何利用各种标准输入输出和管道操作进行数据处理。此外，作者还强调了如何利用shell脚本解决实际的系统管理问题，提升工作效率。《精通Unix Shell脚本编程》不仅是初学者入门的良师益友，也是经验丰富的技术专家提升技能的实用参考书。通过阅读和实践书中的例子，读者将不仅能掌握基础的shell语言，还能培养出在复杂系统环境中编写高效、可维护脚本的能力，从而在Unix系统管理领域站稳脚跟。"

Contents xiii

Automated Host Pinging 49

Highlighting Speciﬁc Text in a File 49

Keeping the Printers Printing 50

AIX ‘‘Classic’’ Printer Subsystem 50

System V and CUPS Printing 50

Automated FTP File Transfer 51

Using rsync to Replicate Data 51

Simple Generic rsync Shell Script 52

Capturing a List of Files Larger than $MEG 53

Capturing a User’s Keystrokes 53

Using the bc Utility for Floating-Point Math 54

Number Base Conversions 55

Using the typeset Command 55

Using the printf Command 55

Create a Menu with the select Command 56

Removing Repeated Lines in a File 58

Removing Blank Lines from a File 58

Testing for a Null Variable 58

Directly Access the Value of the Last Positional Parameter, $# 59

Remove the Column Headings in a Command Output 59

Arrays 60

Loading an Array 60

Testing a String 61

Summary 65

Chapter 2 24 Ways to Process a File Line-by-Line 67

Command Syntax 67

Using File Descriptors 68

Creating a Large File to Use in the Timing Test 68

24 Methods to Parse a File Line-by-Line 73

Method 1: cat

while read LINE 74

Method 2: while

read LINE bottom 75

Method 3: cat

while LINE line 76

Method 4: while

LINE line bottom 77

Method 5: cat

while LINE line cmdsub2 78

Method 6: while

LINE line bottom cmdsub2 79

Method 7: for

LINE cat FILE 79

Method 8: for

LINE cat FILE cmdsub2 80

Method 9: while

line outﬁle 81

Method 10: while

read LINE FD IN 81

Method 11: cat

while read LINE FD OUT 83

Method 12: while

read LINE bottom FD OUT 85

Method 13: while

LINE line bottom FD OUT 86

Method 14: while

LINE line bottom cmdsub2 FD OUT 87

Method 15: for

LINE cat FILE FD OUT 87

Method 16: for

LINE cat FILE cmdsub2 FD OUT 88

Method 17: while

line outﬁle FD

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