Foreword to the Third Edition Foreword to the Fourth Edition Preface Part Ⅰ. The awk Language 1. Getting Started with awk How to Run awk Programs One-Shot Throwaway awk Programs Running awk Without Input Files Running Long Programs Executable awk Programs Comments in awk Programs Shell Quoting Issues Datafiles for the Examples Some Simple Examples An Example with Two Rules A More Complex Example awk Statements Versus Lines Other Features of awk When to Use awk Summary 2. Running awk and gawk Invoking awk Command-Line Options Other Command-Line Arguments Naming Standard Input The Environment Variables gawk Uses The AWKPATH Environment Variable The AWKLIBPATH Environment Variable Other Environment Variables gawks Exit Status Including Other Files into Your Program Loading Dynamic Extensions into Your Program Obsolete Options and/or Features Undocumented Options and Features Summary 3. Regular Expressions How to Use Regular Expressions Escape Sequences Regular Expression Operators Using Bracket Expressions How Much Text Matches？ Using Dynamic Regexps gawk-Specific Regexp Operators Case Sensitivity in Matching Summary 4. Reading Input Files How Input Is Split into Records Record Splitting with Standard awk Record Splitting with gawk Examining Fields Nonconstant Field Numbers Changing the Contents of a Field Specifying How Fields Are Separated Whitespace Normally Separates Fields Using Regular Expressions to Separate Fields Making Each Character a Separate Field Setting FS from the Command Line Making the Full Line Be a Single Field Field-Splitting Summary Reading Fixed-Width Data Defining Fields by Content Multiple-Line Records Explicit Input with getline Using getline with No Arguments Using getline into a Variable Using getline from a File 5. Printing Output 6. Expressions 7. Patterns， Actions， and Variables 8. Arrays in awk 9. Functions Part Ⅱ. Problem Solving with awk 1O. A Library of awk Functions 11. Practical awk Programs Part Ⅲ. Moving Beyond Standard awkwith gawk 12. Advanced Features of gawk 13. Internationalization with gawk 14. Debugging awk Programs 15. Arithmetic and Arbitrary-Precision Arithmetic with gawk 16. Writing Extensions for gawk Part Ⅳ. Appendices A. The Evolution of the awk Language B. Installing gawk C. GNU General Public License Index
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