sed, a stream editor

This file documents version 4.2.1 of GNU sed, a stream editor.

This document is released under the terms of the GNU Free Documentation License as published by the Free Software Foundation; either version 1.1, or (at your option) any later version.

You should have received a copy of the GNU Free Documentation License along with GNU sed; see the file COPYING.DOC. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02110-1301, USA.

There are no Cover Texts and no Invariant Sections; this text, along with its equivalent in the printed manual, constitutes the Title Page.

Introduction: Introduction
Invoking sed: Invocation
sed Programs: sed programs
Examples: Some sample scripts
Limitations: Limitations and (non-)limitations of GNU sed
Other Resources: Other resources for learning about sed
Reporting Bugs: Reporting bugs
Extended regexps: egrep-style regular expressions
Concept Index: A menu with all the topics in this manual.
Command and Option Index: A menu with all sed commands and command-line options.

--- The detailed node listing ---

sed Programs:

Execution Cycle: How sed works
Addresses: Selecting lines with sed
Regular Expressions: Overview of regular expression syntax
Common Commands: Often used commands
The "s" Command: sed's Swiss Army Knife
Other Commands: Less frequently used commands
Programming Commands: Commands for sed gurus
Extended Commands: Commands specific of GNU sed
Escapes: Specifying special characters

Examples:

Centering lines
Increment a number
Rename files to lower case
Print bash environment
Reverse chars of lines
tac: Reverse lines of files
cat -n: Numbering lines
cat -b: Numbering non-blank lines
wc -c: Counting chars
wc -w: Counting words
wc -l: Counting lines
head: Printing the first lines
tail: Printing the last lines
uniq: Make duplicate lines unique
uniq -d: Print duplicated lines of input
uniq -u: Remove all duplicated lines
cat -s: Squeezing blank lines