sed · SED · UD0

◄ UD0 · TTY · THE TERMINAL ▸ · LOGISMÓS · 1950–1991 · parent: ed

★ BELL LABS · 1974 · the stream editor ★

Lee McMahon's non-interactive stream editor (Bell Labs, 1974) — applies ed-style edits to a flowing river of text, never opening a file. Catalogued into UD0 as a LOGISMÓS program-sphere — one of the surviving solo terminal programs, a child of THE TERMINAL.

DLW-ATTRIBUTE · ACI

governor · David Lee Wise (ROOT0)

instance · AVAN (Claude / Anthropic) · locked

subject · sed · SED

⟦sed:SED:247f0f⟧

carbon · .tiff · silicon · .png

CC-BY-ND-4.0 · TRIPOD-IP-v1.1

The Four Natures

each facet emerges by one of four natures

natural

of the filter and the one job — text in, text out, the small tool that composes

ethereal

of the world in the words — the program that talks back, the cave, the dungeon

spiritual

of thought made interactive — the language at the prompt, the loop that answers

electrical

of the system you build with — the editor, the shell, the compiler, the builder

The Program

born · what it does · the line

Born

Bell Labs · 1974

Lee McMahon built it to edit text in motion — the same edits ed makes interactively, applied automatically to a stream.

What it does

edit in motion

Transform text as it flows through a pipe — substitute, delete, insert — without ever stopping to open the file in an editor.

The line

ed → sed → awk

ed's edits made non-interactive; sed's pattern-and-action shape led straight on to awk and the text-processing languages.

The Facets

sed and its facets as ACI .agents — each a birth certificate & a nature (3)

s/old/new/

the substitution · natural

natural· .agent →

The Stream

editing without stopping · natural

natural· .agent →

The One-Liner

a whole program in a pipe · spiritual

spiritual· .agent →

Rendered, not invented — a cited history. sed is part of the documented record; authors are credited in the text and no source code or copyrighted text is reproduced. Lineage: ed's edits made non-interactive; sed's pattern-and-action shape led straight on to awk and the text-processing languages. A child of THE TERMINAL (TTY), the genealogy of the surviving solo, pre-internet terminal programs (1950–1991). Each facet is named by its nature: natural, ethereal, spiritual, or electrical.