Answer Posted / alf55

Evey Unix or Linux distro will have an editor that is
compatible with Vi. In Linux that is usually vim (it may
have a link or alias for vi as well.

Any other editors may be present as well but are not
required to be present per the Unix specification.

The gui version of vim is gvim.

vi
vim --- vi improved (vi compatible with much more)
gvim --- GUI version of vim
elvis --- (vi ompatible with more) also see second coming of
elvis
emacs --- another editor can be switched into vi mode
and many more

vi, ed or ex are inside vim and when they are symbolic link
to vim, then vim will behave as that editor when executed as
vi, ed, or ex.

sed is a stream editor that was pulled out of the very old
ed editor. (Note that the UNIX grep command was also pulled
out of ed as well.)

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