Sed An Introduction
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Author(s):
Text Editing in UNIX A short introduction to vi, pico, and gedit
These slides concentrate on vi because it is very fast and always available. Although the set of commands is very cryptic, by learning a small subset of the commands, you can edit text very quickly.
Author(s): Prof. Stewart Weiss
GNU Emacs Manual
A Tutorial Introduction to GNU Emacs
Unix Text Processing
VIM Regular Expressions (Oleg Raisky)
Vim as XML Editor (Tobias Reif)