“UNIX stores your system configuration in text files, much
like the old Windows INI files. This means the text editor becomes
your most important UNIX configuration tool, so it’s essential that
you learn the main UNIX text editor, vi.“
“Alternately pronounced “vye” or “vee-eye,” vi provides a
full-screen text editor that, while it allows you to edit text,
definitely has some quirks. Designed long ago, vi was one of the
first text editors that used all the lines of text on a terminal
display, called a full-screen editor in contrast to previous
editors that only allowed you to view and modify a line at a time.
While many might think vi is an example of 1970s retro technology,
it still forms the editor available on just about every version of
UNIX. (I would say every version, but I once worked on a system
from Prime Computer that did not include vi.)”
“On all other UNIX systems, however, you may not find many other
editors, but you should find vi.”