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Short Contents

Preface ....................................................................................................................................................................................................................................................

1

1

Introduction ....................................................................................................................................................................................................................................................

5

2

Getting Started with awk ....................................................................................................................................................................................................................................................

9

3

Useful One Line Programs ....................................................................................................................................................................................................................................................

21

4

Regular Expressions ....................................................................................................................................................................................................................................................

23

5

Reading Input Files ....................................................................................................................................................................................................................................................

37

6

Printing Output ....................................................................................................................................................................................................................................................

61

7

Expressions ....................................................................................................................................................................................................................................................

77

8

Patterns and Actions ....................................................................................................................................................................................................................................................

97

9

Control Statements in Actions ....................................................................................................................................................................................................................................................

105

10

Built-in Variables ....................................................................................................................................................................................................................................................

115

11

Arrays in awk ....................................................................................................................................................................................................................................................

123

12

Built-in Functions ....................................................................................................................................................................................................................................................

135

13

User-defined Functions ....................................................................................................................................................................................................................................................

153

14

Running awk ....................................................................................................................................................................................................................................................

161

15

A Library of awk Functions ....................................................................................................................................................................................................................................................

169

16

Practical awk Programs ....................................................................................................................................................................................................................................................

203

17

The Evolution of the awk Language ....................................................................................................................................................................................................................................................

251

Appendix A gawk Summary ....................................................................................................................................................................................................................................................

257

Appendix B Installing gawk ....................................................................................................................................................................................................................................................

277

Appendix C Implementation Notes ....................................................................................................................................................................................................................................................

293

Appendix D Glossary ....................................................................................................................................................................................................................................................

299

GNU GENERAL PUBLIC LICENSE ....................................................................................................................................................................................................................................................

307

Index ....................................................................................................................................................................................................................................................

315