Node: Top , Next: Foreword , Previous: dir , Up: dir General Introduction This file documents awk , a program that you can use to select particular records in a file and perform operations upon them. We were introduced 11 years ago by circumstances--and our favorite programming language, AWK. The circumstances started a couple of years earlier. I was working at a new job and noticed an unplugged Unix computer sitting in the corner. No one knew how to use it, and neither did I. However, a couple of days later it was running, and I was root and the one-and-only user.
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Explore a preview version of Effective awk Programming, 3rd Edition right now. Effective awk Programming, 3rd Edition, focuses entirely on awk, exploring it in the greatest depth of the three awk titles we carry. It's an excellent companion piece tothe more broadly focused second edition. This book providescomplete coverage of the gawk 3. Author Arnold Robbins clearly distinguishesstandard awk features from GNU awk gawk -specific features, shines light into many of the"dark corners" of the language areas to watch out for whenprogramming , and devotes two full chapters to example programs.
Heincludes a summary of how the awk language evolved. The bookalso covers:. In addition to covering the awk language, this book servesas the official "User's Guide" for the GNU implementation of awk gawk , describing in an integrated fashion theextensions available to the System V Release 4 version of awk that are also available in gawk.
As the official gawk User's Guide, this book will also be availableelectronically, and can be freely copied and distributed under theterms of the Free Software Foundation's Free Documentation License FDL. A portion of the proceeds from sales of this book will go tothe Free Software Foundation to support further development of freeand open source software. A portion of the proceeds fromthe sale of this book is donated to the Free Software Foundation tofurther development of GNU software.
Skip to main content. Start your free trial. Effective awk Programming, 3rd Edition by Arnold Robbins. Book Description Effective awk Programming, 3rd Edition, focuses entirely on awk, exploring it in the greatest depth of the three awk titles we carry. Show and hide more. Table of Contents Product Information. The awk Language and gawk 1. Getting Started with awk 1. How to Run awk Programs 1.
One-Shot Throwaway awk Programs 1. Running awk Without Input Files 1. Running Long Programs 1. Executable awk Programs 1.
Comments in awk Programs 1. Shell-Quoting Issues 1. Datafiles for the Examples 1. Some Simple Examples 1. An Example with Two Rules 1. A More Complex Example 1. Other Features of awk 1. When to Use awk 2. Regular Expressions 2. How to Use Regular Expressions 2. Escape Sequences 2. Regular Expression Operators 2. Using Character Lists 2.
Case Sensitivity in Matching 2. How Much Text Matches? Using Dynamic Regexps 3. Reading Input Files 3. How Input Is Split into Records 3. Examining Fields 3. Non-constant Field Numbers 3. Changing the Contents of a Field 3. Specifying How Fields Are Separated 3. Using Regular Expressions to Separate Fields 3.
Making Each Character a Separate Field 3. Setting FS from the Command Line 3. Field-Splitting Summary 3. Reading Fixed-Width Data 3. Multiple-Line Records 3. Explicit Input with getline 3. Using getline with No Arguments 3. Using getline into a Variable 3. Using getline from a File 3. Using getline into a Variable from a File 3. Using getline from a Pipe 3. Using getline into a Variable from a Pipe 3. Using getline from a Coprocess 3.
Using getline into a Variable from a Coprocess 3. Points to Remember About getline 3. Summary of getline Variants 4.
Printing Output 4. The print Statement 4. Examples of print Statements 4. Output Separators 4. Controlling Numeric Output with print 4. Using printf Statements for Fancier Printing 4. Introduction to the printf Statement 4. Format-Control Letters 4. Modifiers for printf Formats 4. Examples Using printf 4. Redirecting Output of print and printf 4. Special Filenames in gawk 4. Special Files for Standard Descriptors 4.
Special Files for Process-Related Information 4. Special Files for Network Communications 4. Special Filename Caveats 4. Closing Input and Output Redirections 5. Expressions 5. Constant Expressions 5. Numeric and String Constants 5. Octal and Hexadecimal Numbers 5. Regular Expression Constants 5. Using Regular Expression Constants 5. Variables 5.
Using Variables in a Program 5. Assigning Variables on the Command Line 5. Conversion of Strings and Numbers 5.
Arithmetic Operators 5. String Concatenation 5. Assignment Expressions 5. Increment and Decrement Operators 5. True and False in awk 5. Variable Typing and Comparison Expressions 5. Boolean Expressions 5.
Conditional Expressions 5. Function Calls 5.
Effective awk Programming, 4th Edition
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GAWK: Effective AWK Programming - The GNU Operating System