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Elvis is a clone of vi/ex, the standard UNIX editor. It supports nearly all of the vi/ex commands, in both visual mode and ex mode. Elvis adds support for multiple files, multiple windows, a variety of display modes (including syntax highlighting, man, tex, html and hex), an optional X11 user interface (see elvis-x11), on-line help, folding, spell checking, new options, auto commands, regions, enhanced tags, printing, aliases and an improved :map command.
Like vi/ex, Elvis stores most of the text in a temporary file, instead of RAM. This allows it to edit files that are too large to fit in a single process' data space. Also, the edit buffer can survive a power failure or crash.