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sed, a stream editor

3. sed Programs

A sed program consists of one or more sed commands, passed in by one or more of the `-e', `-f', `--expression', and `--file' options, or the first non-option argument if zero of these options are used. This document will refer to "the" sed script; this is understood to mean the in-order catenation of all of the scripts and script-files passed in.

Each sed command consists of an optional address or address range, followed by a one-character command name and any additional command-specific code.

3.1 Selecting lines with sed
3.2 Overview of Regular Expression Syntax		Overview of regular expression syntax
3.3 Where sed Buffers Data		Where sed buffers data
3.4 Often-Used Commands		Often used commands
3.5 The s Command		sed's Swiss Army Knife
3.6 Less Frequently-Used Commands		Less frequently used commands
3.7 Commands for sed gurus
3.8 Commands Specific to GNU sed		Commands specific of GNU sed
3.9 GNU Extensions for Escapes in Regular Expressions		Specifying special characters