Guide to Unix/Commands/File Editing

Basic editing of system files.

pico

Nano is a clone of Pico. Pico (text editor) is an easy-to-learn text editor originally designed for composing e-mail in Pine.

zile

A light-weight, feature-reduced clone of emacs.

vi

A powerful editor based on ex. For details see the Wikibooks Learning the vi Editor.

emacs

A very powerful editor that is used by many programers.