What is vi?

What is vi?

• A script
• A mail program
• An editor
• A shell 

EXPLANATION

vi

vi is a screen-oriented text editor originally created for the Unix operating system. The portable subset of the behavior of vi and programs based on it, and the ex editor language supported within these programs, is described by the Single Unix Specification and POSIX.Wikipedia

Developer(s):Bill Joy

Initial release:1976

Written in:C