https://sandromagri.info/en/ict/600-ict-docs/dev-tools/index.htmlthere is a text editor with text interface for BSD and Unix. The name is derived from the shortest unambiguous abbreviation of the visual command in ex (i.e. ‘vi’ ) The program was written by Bill Joy in 1976 for an early version of BSD. Subsequently, it became the de facto standard editor for Unix, undermined only by emacs. A modal editor (like any other modal program) assigns different actions to keys depending on the mode active at the time they are pressed. The main editing modes in there are insert and command modes. In insert mode, when a key is pressed, the character typed is interpreted as belonging to the text to be entered into the editor and not as a command, as is the case in the previous mode.Hugoensandro@freenetst.it (Sandro Magrì)sandro@freenetst.it (Sandro Magrì)2020- All rights reserved.