How to select/delete until end of file in vim/gvim

The 9 previous yanks are saved in registers called 1 through 9. You can recall the next-to-last yank with "1p, the previous one with "2p and so on. The command :reg shows the registers that are available for pasting.

If you want a yank to last longer, use a letter register.

For the more obscure yank-related commands, start reading at :help " in the manual.

Vim uses the system cut-and-paste mechanism to copy text between instances. When you run vim in a terminal, it doesn't have direct access to any cut-and-paste mechanism. If vim is running in xterm or some other terminal that provides access to X selections and clipboard contents, vim can use that; however your vim binary is compiled without support for that feature.

If both vim instances are running on the same machine, you can use a temporary file to communicate:

:w ~/vim.tmp
:r ~/vim.tmp

If both vim instances are connected to the same X display (in that the DISPLAY environment variable points to the same X display, the vim programs themselves don't need to have any kind of X support), you can use the X selections via an external program such as xsel or xclip. You can omit the p or -selection primary or choose a different selection (-s/secondary or -b/clipboard). Use :w ! (note the space) to copy:

:w !xsel -ip
:w !xclip -i -selection primary

and :r! to paste:

:r !xsel -op
:r !xclip -o -selection primary