vi the text editor

You might be looking for ./vim

You don't grok vi

/usr/bin/vi hijacking

Some packages of editors in the vi family insist in symlinking
/usr/bin/vi to their editor.  Whichever started doing it probably
thought it was Just Fine, but there are many of them now and their
symlinks overwrite each other.  So let's say you install both vim and
vis (assuming Ubuntu software repositories for the sake of argument).
Which one does 'vi' point to? Whichever you installed last.

Distributions: keep your hands off vi

Where vi>>vim

Vim still sucks
vi is not vim