SED and Bourne Shell scripts by a seder in Taiwan.

The Open Group "Single UNIX Specification" man page.

Dreamwvr.com's alternate frequently asked questions list is arranged in increasing order of difficulty, and can be read as a tutorial.

Eric Pement's Cornerstone Mag site hosts FAQs, download sites for most operating systems, list of handy one-liners, table of version differences, and links.

Some items selected by Yiorgos Adamopoulos from the Seders grab bag and mailing list.

Wish list and manifesto for development of a new version of the editor.

Benny Pedersen gives examples of the use of SED in DOS batch files.