Question

As the title suggests, how to split the page vertically on startup with .vimrc?

Answer 1

If you want a vertical split when vim starts up, add an autocommand to your .vimrc:

au VimEnter * vsplit

Note that vim will do this for you if you’re opening multiple files on the command line: use the -O switch.

-o[N] Open N windows (default: one for each file)

-O[N] Like -o but split vertically

So you can start vim like this:

$ vim -O MyPage.html MyPage.css

And vim will open with those two files both visible in a vertical split.