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sed & awk describes two text processing programs that are mainstays of the UNIX programmer's toolbox.sed is a "stream editor" for editing streams of text that might be too large to edit as a single file, or that might be generated on the fly as part of a larger data processing step. The most common operation done with sed is substitution, replacing one block of text with another.awk is a complete programming language. Unlike many conventional languages, awk is "data driven" -- you specify what kind of data you are interested in and the operations to be performed when that data is found. awk…mehr

Produktbeschreibung
sed & awk describes two text processing programs that are mainstays of the UNIX programmer's toolbox.sed is a "stream editor" for editing streams of text that might be too large to edit as a single file, or that might be generated on the fly as part of a larger data processing step. The most common operation done with sed is substitution, replacing one block of text with another.awk is a complete programming language. Unlike many conventional languages, awk is "data driven" -- you specify what kind of data you are interested in and the operations to be performed when that data is found. awk does many things for you, including automatically opening and closing data files, reading records, breaking the records up into fields, and counting the records. While awk provides the features of most conventional programming languages, it also includes some unconventional features, such as extended regular expression matching and associative arrays. sed & awk describes both programs in detail and includes a chapter of example sed and awk scripts.This edition covers features of sed and awk that are mandated by the POSIX standard. This most notably affects awk, where POSIX standardized a new variable, CONVFMT, and new functions, toupper() and tolower(). The CONVFMT variable specifies the conversion format to use when converting numbers to strings (awk used to use OFMT for this purpose). The toupper() and tolower() functions each take a (presumably mixed case) string argument and return a new version of the string with all letters translated to the corresponding case.In addition, this edition covers GNU sed, newly available since the first edition. It also updates the first edition coverage of Bell Labs nawk and GNU awk (gawk), covers mawk, an additional freely available implementation of awk, and briefly discusses three commercial versions of awk, MKS awk, Thompson Automation awk (tawk), and Videosoft (VSAwk).
  • Produktdetails
  • Nutshell Handbooks
  • Verlag: O'Reilly Media
  • 2nd ed.
  • Seitenzahl: 434
  • Erscheinungstermin: März 1997
  • Englisch
  • Abmessung: 233mm x 177mm x 30mm
  • Gewicht: 596g
  • ISBN-13: 9781565922259
  • ISBN-10: 1565922255
  • Artikelnr.: 05171420
Autorenporträt
Dale Dougherty is the publisher of the O'Reilly Network and Director of O'Reilly Research. Dale has been instrumental in many of O'Reilly's most important efforts, including founding O'Reilly & Associates with Tim O'Reilly. He was the developer and publisher of Global Network Navigator (GNN), the first commercial Web site. Dale was developer and publisher of Web Review, the online magazine for Web designers, and he was O'Reilly & Associates' first editor. Dale has written and edited numerous books at O'Reilly & Associates. Dougherty is a Lecturer in the School of Information Management and Systems (SIMS) at the University of California at Berkeley. Arnold Robbins, an Atlanta native, is a professional programmer and technical author. He has worked with Unix systems since 1980, when he was introduced to a PDP-11 running a version of Sixth Edition Unix. He has been a heavy AWK user since 1987, when he became involved with gawk, the GNU project's version of AWK. As a member of the POSIX 1003.2 balloting group, he helped shape the POSIX standard for AWK. He is currently the maintainer of gawk and its documentation. He is also coauthor of the sixth edition of O'Reilly's Learning the vi Editor. Since late 1997, he and his family have been living happily in Israel.
Inhaltsangabe
Dedication
Preface
Scope of This Handbook
Availability of sed and awk
Obtaining Example Source Code
Conventions Used in This Handbook
About the Second Edition
Acknowledgments from the First Edition
Comments and Questions
Chapter 1: Power Tools for Editing
1.1 May You Solve Interesting Problems
1.2 A Stream Editor
1.3 A Pattern-Matching Programming Language
1.4 Four Hurdles to Mastering sed and awk
Chapter 2: Understanding Basic Operations
2.1 Awk, by Sed and Grep, out of Ed
2.2 Command-Line Syntax
2.3 Using sed
2.4 Using awk
2.5 Using sed and awk Together
Chapter 3: Understanding Regular Expression Syntax
3.1 That's an Expression
3.2 A Line-Up of Characters
3.3 I Never Metacharacter I Didn't Like
Chapter 4: Writing sed Scripts
4.1 Applying Commands in a Script
4.2 A Global Perspective on Addressing
4.3 Testing and Saving Output
4.4 Four Types of sed Scripts
4.5 Getting to the PromiSed Land
Chapter 5: Basic sed Commands
5.1 About the Syntax of sed Commands
5.2 Comment
5.3 Substitution
5.4 Delete
5.5 Append, Insert, and Change
5.6 List
5.7 Transform
5.8 Print
5.9 Print Line Number
5.10 Next
5.11 Reading and Writing Files
5.12 Quit
Chapter 6: Advanced sed Commands
6.1 Multiline Pattern Space
6.2 A Case for Study
6.3 Hold That Line
6.4 Advanced Flow Control Commands
6.5 To Join a Phrase
Chapter 7: Writing Scripts for awk
7.1 Playing the Game
7.2 Hello, World
7.3 Awk's Programming Model
7.4 Pattern Matching
7.5 Records and Fields
7.6 Expressions
7.7 System Variables
7.8 Relational and Boolean Operators
7.9 Formatted Printing
7.10 Passing Parameters Into a Script
7.11 Information Retrieval
Chapter 8: Conditionals, Loops, and Arrays
8.1 Conditional Statements
8.2 Looping
8.3 Other Statements That Affect Flow Control
8.4 Arrays
8.5 An Acronym Processor
8.6 System Variables That Are Arrays
Chapter 9: Functions
9.1 Arithmetic Functions
9.2 String Functions
9.3 Writing Your Own Functions
Chapter 10: The Bottom Drawer
10.1 The getline Function
10.2 The close( ) Function
10.3 The system( ) Function
10.4 A Menu-Based Command Generator
10.5 Directing Output to Files and Pipes
10.6 Generating Columnar Reports
10.7 Debugging
10.8 Limitations
10.9 Invoking awk Using the #! Syntax
Chapter 11: A Flock of awks
11.1 Original awk
11.2 Freely Available awks
11.3 Commercial awks
11.4 Epilogue
Chapter 12: Full-Featured Applications
12.1 An Interactive Spelling Checker
12.2 Generating a Formatted Index
12.3 Spare Details of the masterindex Program
Chapter 13: A Miscellany of Scripts
13.1 uutot.awk-Report UUCP Statistics
13.2 phonebill-Track Phone Usage
13.3 combine-Extract Multipart uuencoded Binaries
13.4 mailavg-Check Size of Mailboxes
13.5 adj-Adjust Lines for Text Files
13.6 readsource-Format Program Source Files for troff
13.7 gent-Get a termcap Entry
13.8 plpr-lpr Preprocessor
13.9 transpose-Perform a Matrix Transposition
13.10 m1-Simple Macro Processor
Appendix A: Quick Reference for sed
A.1 Command-Line Syntax
A.2 Syntax of sed Commands
A.3 Command Summary for sed
Appendix B: Quick Reference for awk
B.1 Command-Line Syntax
B.2 Language Summary for awk
B.3 Command Summary for awk
Appendix C: Supplement for Chapter 12
C.1 Full Listing of spellcheck.awk
C.2 Listing of masterindex Shell Script
C.3 Documentation for masterindex
C.3.1 Background Details
C.3.2 Coding Index Entries
C.3.3 Output Format
C.3.4 Compiling a Master Index
Colophon