sed tutorial

Transform streams of text with focused, composable editing commands.

sed16 lessons

printf 'draft\n' | sed 's/draft/ready/'

Designed forUnix users and automation builders

Learning formatShort explanations, examples, practice connections

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COURSE CURRICULUM

16 lessons in a clear order

Finish one section at a time or jump directly to a concept you need.

Foundations

sed streams, scripts, and address cycles

Learn how sed streams, scripts, and address cycles works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.

Commands, addresses, and delimiters

Learn how commands, addresses, and delimiters works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.

Core concepts

Pattern space, hold space, and labels

Learn how pattern space, hold space, and labels works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.

Lines, ranges, captures, and replacement data

Learn how lines, ranges, captures, and replacement data works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.

Substitution flags, branching, and grouping

Learn how substitution flags, branching, and grouping works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.

Control flow

Address selection and conditional commands

Learn how address selection and conditional commands works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.

Cycles, multiline work, and bounded loops

Learn how cycles, multiline work, and bounded loops works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.

Data and composition

Reusable sed scripts and command files

Learn how reusable sed scripts and command files works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.

Pattern and hold spaces as working data

Learn how pattern and hold spaces as working data works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.

Regular expressions, captures, and replacements

Learn how regular expressions, captures, and replacements works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.

Reliability and structure

Unmatched input, portability, and safe edits

Learn how unmatched input, portability, and safe edits works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.

Script files, comments, and command organization

Learn how script files, comments, and command organization works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.

Applied engineering

State machines with labels and hold space

Learn how state machines with labels and hold space works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.

Files, in-place editing, and backup boundaries

Learn how files, in-place editing, and backup boundaries works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.

Testing transformations against golden files

Learn how testing transformations against golden files works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.

Capstone

Capstone: a portable sed migration

Learn how capstone: a portable sed migration works in sed, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.