Effective awk programming /

Effective awk Programming,3rd Edition, focuses entirely onawk, exploring it in the greatest depth of the three awk titles we carry. It's an excellent companion piece to the more broadly focused second edition. This book provides complete coverage of the gawk 3.1 language as well as the most up-...

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Detalles Bibliográficos
Clasificación:Libro Electrónico
Autor principal: Robbins, Arnold
Formato: Electrónico eBook
Idioma:Inglés
Publicado: Beijing ; Sebastopol, CA : O'Reilly, 2001.
Edición:3rd ed.
Temas:
AWK (Computer program language)
AWK (Langage de programmation)
COMPUTERS > Programming Languages > C♯
COMPUTERS > Programming Languages > Java.
COMPUTERS > Programming Languages > Pascal.
Acceso en línea:Texto completo (Requiere registro previo con correo institucional)
Tabla de Contenidos:
  • I. Awk Language and gawk 1
  • 1. Getting Started with awk 3
  • How to Run awk Programs 4
  • Datafiles for the Examples 10
  • An Example with Two Rules 13
  • A More Complex Example 14
  • awk Statements Versus Lines 15
  • Other Features of AWK 17
  • When to Use AWK 17
  • 2. Regular Expressions 19
  • How to Use Regular Expressions 19
  • Escape Sequences 21
  • Regular Expression Operators 23
  • Using Character Lists 26
  • gawk-Specific Regexp Operators 28
  • Case Sensitivity in Matching 29
  • How Much Text Matches? 31
  • Using Dynamic Regexps 31
  • 3. Reading Input Files 33
  • How Input Is Split into Records 33
  • Examining Fields 36
  • Non-constant Field Numbers 38
  • Changing the Contents of a Field 39
  • Specifying How Fields Are Separated 41
  • Reading Fixed-Width Data 46
  • Multiple-Line Records 48
  • Explicit Input with getline 51
  • 4. Printing Output 58
  • Print Statement 58
  • Examples of print Statements 59
  • Output Separators 60
  • Controlling Numeric Output with print 61
  • Using printf Statements for Fancier Printing 62
  • Redirecting Output of print and printf 68
  • Special Filenames in gawk 70
  • Closing Input and Output Redirections 74
  • 5. Expressions 78
  • Constant Expressions 79
  • Using Regular Expression Constants 81
  • Variables 82
  • Conversion of Strings and Numbers 84
  • Arithmetic Operators 85
  • String Concatenation 87
  • Assignment Expressions 88
  • Increment and Decrement Operators 92
  • True and False in awk 93
  • Variable Typing and Comparison Expressions 94
  • Boolean Expressions 97
  • Conditional Expressions 99
  • Function Calls 99
  • Operator Precedence (How Operators Nest) 101
  • 6. Patterns, Actions, and Variables 103
  • Pattern Elements 103
  • Using Shell Variables in Programs 109
  • Actions 110
  • Control Statements in Actions 111
  • Built-in Variables 120
  • 7. Arrays in AWK 129
  • Introduction to Arrays 130
  • Referring to an Array Element 132
  • Assigning Array Elements 133
  • Basic Array Example 133
  • Scanning All Elements of an Array 134
  • Delete Statement 135
  • Using Numbers to Subscript Arrays 136
  • Using Uninitialized Variables as Subscripts 137
  • Multidimensional Arrays 138
  • Scanning Multidimensional Arrays 139
  • Sorting Array Values and Indices with gawk 140
  • 8. Functions 142
  • Built-in Functions 142
  • User-Defined Functions 166
  • 9. Internationalization with GAWK 174
  • Internationalization and Localization 174
  • GNU gettext 175
  • Internationalizing awk Programs 177
  • Translating AWK Programs 179
  • A Simple Internationalization Example 182
  • GAWK Can Speak Your Language 183
  • 10. Advanced Features of gawk 185
  • Allowing Nondecimal Input Data 185
  • Two-Way Communications with Another Process 186
  • Using gawk for Network Programming 188
  • Using gawk with BSD Portals 189
  • Profiling Your AWK Programs 190
  • 11. Running awk and GAWK 194
  • Invoking AWK 194
  • Command-Line Options 195
  • Other Command-Line Arguments 200
  • AWKPATH Environment Variable 201
  • Obsolete Options and/or Features 202
  • Known Bugs in GAWK 203
  • II. Using awk and GAWK 205
  • 12. A Library of awk Functions 207
  • Naming Library Function Global Variables 208
  • General Programming 210
  • Datafile Management 218
  • Processing Command-Line Options 222
  • Reading the User Database 228
  • Reading the Group Database 232
  • 13. Practical awk Programs 237
  • Running the Example Programs 237
  • Reinventing Wheels for Fun and Profit 238
  • A Grab Bag of awk Programs 259
  • 14. Internetworking with GAWK 281
  • Networking with GAWK 281
  • Some Applications and Techniques 305
  • Related Links 323
  • A. Evolution of the AWK Language 327
  • B. Installing GAWK 337
  • C. Implementation Notes 350.

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