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Informationen zum Autor Steve Parker is an IT consultant specializing in Solaris and GNU/Linux. He has been providing consultancy services for more than a decade. He is the author of the popular Bourne Shell Programming/Scripting Tutorial (http://steve-parker.org/sh/sh.shtml), which sees more than one million visitors a year. Klappentext A compendium of shell scripting recipes that can immediately be used, adjusted, and appliedThe shell is the primary way of communicating with the Unix and Linux systems, providing a direct way to program by automating simple-to-intermediate tasks. With this book, Linux expert Steve Parker shares a collection of shell scripting recipes that can be used as is or easily modified for a variety of environments or situations. The book covers shell programming, with a focus on Linux and the Bash shell; it provides credible, real-world relevance, as well as providing the flexible tools to get started immediately.* Shares a collection of helpful shell scripting recipes that can immediately be used for various of real-world challenges* Features recipes for system tools, shell features, and systems administration* Provides a host of plug and play recipes for to immediately apply and easily modify so the wheel doesn't have to be reinvented with each challenge facedCome out of your shell and dive into this collection of tried and tested shell scripting recipes that you can start using right away! Zusammenfassung A compendium of shell scripting recipes that can immediately be used or adjusted The Shell is the primary way of communicating with Unix and Linux and provides a direct way to program the system by automating simple-to-intermediate tasks. Inhaltsverzeichnis Introduction xxix Part I: About the Ingredients Chapter 1: The History of Unix, Gnu, and Linux 3 Unix 3 "Everything is a File" and Pipelines 5 BSD 6 GNU 7 Linux 11 Summary 12 Chapter 2: Getting Started 15 Choosing an OS 15 GNU/Linux 15 The BSDs 17 Proprietary Unix 17 Microsoft Windows 17 Choosing an Editor 18 Graphical Text Editors 18 Terminal Emulation 21 Nongraphical Text Editors 22 Setting Up the Environment 24 The Shell Profile 24 Aliases 26 vim Settings 30 Summary 31 Chapter 3: Variables 33 Using Variables 33 Typing 34 Assigning Values to Variables 35 Positional Parameters 39 Return Codes 42 Unsetting Variables 45 Preset and Standard Variables 47 BASH_ENV 47 BASHOPTS 47 SHELLOPTS 48 BASH_COMMAND 50 BASH_SOURCE, FUNCNAME, LINENO, and BASH_LINENO 51 SHELL 55 HOSTNAME and HOSTTYPE 55 Working Directory 55 PIPESTATUS 55 TIMEFORMAT 56 PPID 57 RANDOM 58 REPLY 58 SECONDS 58 BASH_XTRACEFD 59 GLOBIGNORE 60 HOME 62 IFS 62 PATH 63 TMOUT 64 TMPDIR 65 User Identification Variables 65 Summary 66 Chapter 4: Wildcard Expansion 67 Filename Expansion (Globbing) 67 Bash Globbing Features 70 Shell Options 71 Regular Expressions and Quoting 75 Overview of Regular Expressions 76 Quoting 77 Summary 81 Chapter 5: Conditional Execution 83 If/Then 83 Else 85 elif 85 Test ([) 87 Flags for Test 88 File Comparison Tests 95 String Comparison Tests 96 Regular Expression Tests 98 Numerical Tests 101 Combining Tests 103 Case 105 Summary 109 Chapter 6: Flow Control Using Loops 111 For Loops 111 When to Use for Loops 112 Imaginative Ways of Feeding "for" with Data 112 C-Style for Loops 118 while Loops 119
