This tutorial an elementary introduction to teach non-programmers how to customize their work environment; it can also be used as an introduction to programming basics. It includes numerous exercises and sample programs; the author also walks you through the actual source code of several GNU Emacs commands. A handy reference appendix is included.Emacs Lisp is a simple, complete, and powerful programming language. It is the building block of GNU Emacs, which is an integrated development environment with special features for scanning and parsing text as well as for handling multiple files, buffers, displays, windows, and sub-processors.