深入学习高级Bash脚本教程：迈向中级/高级阶段

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"《高级Bash脚本指南》(Advanced Bash-Scripting Guide)是一本深入探讨shell脚本艺术的详尽教程，由Mendel Cooper撰写，电子邮箱地址为<the_grendel.abs@gmail.com>。本书特别适合那些对编程和脚本技术无基础但希望快速提升至中级或高级水平的学习者。作者巧妙地融入了Unix®的智慧和传统，使这不仅是一本教材，也是一本自我学习的手册，以及关于shell脚本技巧的权威参考书。书中强调实践学习的重要性，鼓励读者积极参与通过大量带有详尽注释的实例进行的实践活动，认为只有通过编写脚本来真正掌握这一技能。作者Mc（可能指代Mendel Cooper）在不同版本中持续更新和修订，如6.2版的'ROWANBERRY'发布，6.3版的'SWOZZLEBERRY'更新，直到6.4版的'VORTEXBERRY'，确保内容始终紧跟最新技术动态。本书特别适合用作课堂入门教程，介绍编程的基本概念，旨在激发初学者对编程世界的兴趣，并通过逐步教授如何构建和优化Bash脚本来培养他们的技能。每一章都设有详细的目录，例如：第1章：Shell编程入门！ - 这一章节将引导读者了解shell编程的基础，并奠定后续章节的基础。第2章：从一个Bash-Bang开始 - 2.1 脚本的调用：介绍了如何正确地启动和执行脚本，这是所有编程旅程的起点。 - 2.2 预备练习：为读者提供了初期的实战练习，帮助他们熟悉环境并逐渐熟悉Bash语言的语法和逻辑。通过这样的结构，本书为读者提供了一个循序渐进的学习路径，无论是对于想要掌握Bash脚本技术的专业人士还是对编程感兴趣的业余爱好者，都是极其有价值的资源。阅读这本书，不仅能提升编程能力，还能深入理解Unix/Linux系统的核心工作原理。"

bash$ cp /home/bozo/current_work/junk/* .

Copy all the "junk" files to $PWD.

"dot" character match. When matching characters, as part of a regular expression, a "dot" matches a

single character.

partial quoting [double quote]. "STRING" preserves (from interpretation) most of the special

characters within STRING. See Chapter 5.

full quoting [single quote]. 'STRING' preserves all special characters within STRING. This is a

stronger form of quoting than "STRING". See Chapter 5.

comma operator. The comma operator [16] links together a series of arithmetic operations. All are

evaluated, but only the last one is returned.

let "t2 = ((a = 9, 15 / 3))"

# Set "a = 9" and "t2 = 15 / 3"

The comma operator can also concatenate strings.

for file in /{,usr/}bin/*calc

# ^ Find all executable files ending in "calc"

#+ in /bin and /usr/bin directories.

if [ -x "$file" ]

then

echo $file

done

# /bin/ipcalc

# /usr/bin/kcalc

# /usr/bin/oidcalc

# /usr/bin/oocalc

# Thank you, Rory Winston, for pointing this out.

,, ,

Lowercase conversion in parameter substitution (added in version 4 of Bash).

escape [backslash]. A quoting mechanism for single characters.

\X escapes the character X. This has the effect of "quoting" X, equivalent to 'X'. The \ may be used to

quote " and ', so they are expressed literally.

See Chapter 5 for an in-depth explanation of escaped characters.

Filename path separator [forward slash]. Separates the components of a filename (as in

/home/bozo/projects/Makefile).

This is also the division arithmetic operator.

command substitution. The `command` construct makes available the output of command for

assignment to a variable. This is also known as backquotes or backticks.

Advanced Bash-Scripting Guide

Chapter 3. Special Characters 10

In combination with the >> redirection operator, has no effect on a pre-existing target file (: >>

target_file). If the file did not previously exist, creates it.

This applies to regular files, not pipes, symlinks, and certain special files.

May be used to begin a comment line, although this is not recommended. Using # for a comment

turns off error checking for the remainder of that line, so almost anything may appear in a comment.

However, this is not the case with :.

: This is a comment that generates an error, ( if [ $x -eq 3] ).

The ":" serves as a field separator, in /etc/passwd, and in the $PATH variable.

bash$ echo $PATH

/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/sbin:/usr/sbin:/usr/games

A colon is acceptable as a function name.

:()

{

echo "The name of this function is "$FUNCNAME"

# Why use a colon as a function name?

# It's a way of obfuscating your code.

}

# The name of this function is :

This is not portable behavior, and therefore not a recommended practice.

reverse (or negate) the sense of a test or exit status [bang]. The ! operator inverts the exit status of

the command to which it is applied (see Example 6-2). It also inverts the meaning of a test operator.

This can, for example, change the sense of equal ( = ) to not-equal ( != ). The ! operator is a Bash

keyword.

In a different context, the ! also appears in indirect variable references.

In yet another context, from the command line, the ! invokes the Bash history mechanism (see

Appendix K). Note that within a script, the history mechanism is disabled.

wild card [asterisk]. The * character serves as a "wild card" for filename expansion in globbing. By

itself, it matches every filename in a given directory.

bash$ echo *

abs-book.sgml add-drive.sh agram.sh alias.sh

The * also represents any number (or zero) characters in a regular expression.

arithmetic operator. In the context of arithmetic operations, the * denotes multiplication.

** A double asterisk can represent the exponentiation operator or extended file-match globbing.

test operator. Within certain expressions, the ? indicates a test for a condition.

Advanced Bash-Scripting Guide

Chapter 3. Special Characters 12

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深入学习高级Bash脚本教程：迈向中级/高级阶段

Advanced Bash-Scripting Guide 3.9.1 （包括中译本）

高级Bash脚本编程指南（Advanced Bash-Scripting Guide 中文）

Advanced Bash-Scripting Guide 中英版及源码

abs-guide----Advanced Bash-Scripting Guide

高级Bash编程指南 - Advanced Bash-Scripting Guide

Mendel Cooper - Advanced Bash-Scripting Guide

Advanced Bash-Scripting Guide 中英文

Advanced Bash-Scripting Guide .pdf

Advanced Bash-Scripting Guide 英文原版

Advanced Bash-Scripting Guide v6.6

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