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GNU Grep 3.7

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grep

grep prints lines that contain a match for one or more patterns.

This manual is for version 3.7 of GNU Grep.

This manual is for grep, a pattern matching engine.

Copyright © 1999–2002, 2005, 2008–2021 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled “GNU Free Documentation License”.

Table of Contents

• 1 Introduction
• 2 Invoking grep
  • 2.1 Command-line Options
    • 2.1.1 Generic Program Information
    • 2.1.2 Matching Control
    • 2.1.3 General Output Control
    • 2.1.4 Output Line Prefix Control
    • 2.1.5 Context Line Control
    • 2.1.6 File and Directory Selection
    • 2.1.7 Other Options
  • 2.2 Environment Variables
  • 2.3 Exit Status
  • 2.4 grep Programs
• 3 Regular Expressions
  • 3.1 Fundamental Structure
  • 3.2 Character Classes and Bracket Expressions
  • 3.3 The Backslash Character and Special Expressions
  • 3.4 Anchoring
  • 3.5 Back-references and Subexpressions
  • 3.6 Basic vs Extended Regular Expressions
  • 3.7 Character Encoding
  • 3.8 Matching Non-ASCII and Non-printable Characters
• 4 Usage
• 5 Performance
• 6 Reporting bugs
  • 6.1 Known Bugs
• 7 Copying
  • 7.1 GNU Free Documentation License
• Index

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