How to copy to clipboard in Vim?

Requirements

$ vim --version | grep clipboard

+clipboard         +keymap            +printer           +vertsplit
+eval              -mouse_jsbterm     -sun_workshop      +xterm_clipboard

if clipboard is -, then we need install vim-gtk.

for example, on ubuntu:

$ sudo apt install -y vim-gtk

Settings

vim ~/.vimrc

On macOS and Windows set:

$ set clipboard=unnamed

On Linux set (vim 7.3.74+):

$ set clipboard=unnamedplus