How do I get vim to keep its undo history?
The newest version of vim (7.3) has persistent undo, so that you can make a change, close vim completely (even shutdown and restart), restart vim, and undo. In your .vimrc:
" tell it to use an undo file
set undofile
" set a directory to store the undo history
set undodir=/home/yourname/.vimundo/
Looks like this will do it:
:set hidden
(in .vimrc)
You can use Viewports.
"vim -o testfile1 testfile2" - open files in splitted window.
":sp filename" - split and open "filename".
":vsp filename" - vertical split and open "filename".
"Ctrl+w+arrow" - Change viewport.