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Description Emacs is an "advanced, self-documenting, customizable, extensible real-time display editor".
Version installed Ubuntu 18.04: v25.2.2 (from the Ubuntu repositories).
Usage At the command prompt, type:

The behaviour of Emacs can be customized by the file /home/user/.emacs, and by setting resources (colours, fonts, etc) in /home/user/.Xdefaults
Upgrade Notes   
Manuals and
See the Unix man page. Or, for datailed info, click on Help in the Emacs window.
A huuuge GNU Emacs Manual is also available on-line.
SIE contact Nicola Caon - - tel: 5383 - office: 1.124
Additional Info An example .emacs file can be found in the SIE Wiki.

An alternative editor is XEmacs, sort of a good-looking Emacs with a different flavour. A simpler and maybe now more popular editor is Nedit.