Vim copy to system clipboard on a Mac

(from: http://vim.wikia.com/wiki/Mac_OS_X_clipboard_sharing)

Having trouble copying selected text from Vim (not MacVim)? Since using "+y or '"*y' in Vim on a Mac doesn't actually copy the selected text to the system clipboard, you might find it beneficial to do the following:

1. Open your ~/.vimrc file
2. add vmap '' :w !pbcopy<CR><CR>
3. Save it/source the file

Voila! You can now copy to the system clipboard, in visual mode, via ''!