When using opening multiple files with split windows from the command line, vim likes to state what the file names are, the line count, and the character count, for each file. T
Mykola Golubyev's answer ist good, but you probably want to use +=
instead of =
in order to keep the flags that are already present.
set shortmess+=at
Otherwise it might have unwanted side effects like those mentioned in the above comments.
You have to play with 'shortmess' vim option.
:help shortmess
Either set it in your .vimrc
set shortmess=at
or during the vim run
vim --cmd 'set shortmess=at'