Vim: External Command

Insert from other file

:read <somefile>
:r <somefile>

Insert command result

:read !ls
:r !ls

Output to external command. If you do not define the range, then by default, it will use all lines (1, $) in the file as an input for that command.

console.log("Hello, World")

:write !node
:w !node

Running external command

:!ls
:!node