Line editor personality of the UNIX vi editor
Author: Bill Joy Homepage: http://ex-vi.sourceforge.net/ Man Page: http://ex-vi.sourceforge.net/ex.html Family: ViFamily Platform: UNIX License: BSD
See also VI
It is the command language for the VI editor. It is also usable as a stand-alone editor.
Under Unix, ex and vi are hard links to the same executable. Which personality it assumes depends upon the name it was invoked by, and one can switch back and forth between ex and vi modes during a session. --DMcCunney