EMAC

                                                        EMACS   

—Emacs Text editor is a popular & powerful program that is available on many platforms. Ex: UNIX, DOS, Windows 9x and NT, and  OS/2.

—Emacs -extensible, customizable, self-documenting real-time display editor-GNU

—Unlike vi, emacs is not an insertion mode editor, -character typed in emacs is automatically inserted into the file.

Why Emacs?

Emacs helps you be productive by providing an integrated environment for many different kinds of tasks:

• All of the basic editing commands (and there are lots of them) are available no matter what you're trying to do: write code, read a manual, use a shell, or compose an email.
• All the tools Emacs provides for opening, saving, searching, and processing text (and more) are available to you no matter what you're doing.

This uniformity means that working within Emacs is often easier than learning to use a separate program, especially when that program is liable to have its own set of editing capabilities and shortcuts.

If Emacs doesn't work the way you'd like, you can use the Emacs Lisp (Elisp) language to customize Emacs, automate common tasks, or add new features. Elisp is very easy to get started with and yet remarkably powerful: you can use it to alter and extend almost any feature of Emacs. You can make Emacs whatever you want it to be by writing Elisp code; one testament to this is the fact that all of the features pictured above (and many more described later in this tour) are written in Elisp.

Emacs is also portable. You can use the same editor (with the same configuration) on many platforms, including GNU/Linux, BSD and other Unix derivatives, and some proprietary operating systems such as Microsoft Windows.