<Undo> or *undo* *<Undo>* *u*
u Undo [count] changes. {Vi: only one level}
*:u* *:un* *:undo*
:u[ndo] Undo one change. {Vi: only one level}
*CTRL-R*
CTRL-R Redo [count] changes which were undone. {Vi: redraw screen}
*:red* *:redo* *redo*
:red[o] Redo one change which was undone. {Vi: no redo}
*U*
U Undo all latest changes on one line. {Vi: while not
moved off of it}
First press the Esc key to exit from edit mode.
Then,
For undo, use u key as many times you want to undo.
For redo, use Ctrl +r key
Use :earlier/:later. To redo everything you just need to do
later 9999999d
(assuming that you first edited the file at most 9999999 days ago), or, if you remember the difference between current undo state and needed one, use Nh, Nm or Ns for hours, minutes and seconds respectively. + :later N<CR> <=> Ng+ and :later Nf for file writes.
Also check out :undolist, which offers multiple paths through the undo history. This is useful if you accidentally type something after undoing too much.
Refer to the "undo" and "redo" part of Vim document.
:red[o] (Redo one change which was undone) and {count} Ctrl+r (Redo {count} changes which were undone) are both ok.
Also, the :earlier {count} (go to older text state {count} times) could always be a substitute for undo and redo.
Practically speaking, the :undolist is hard to use and Vim’s :earlier and :later time tracking of changes is only usable for course-grain fixes.
Given that, I resort to a plug-in that combines these features to provide a visual tree of browsable undos, called “Gundo.”
Obviously, this is something to use only when you need a fine-grained fix, or you are uncertain of the exact state of the document you wish to return to. See: Gundo. Graph your Vim undo tree in style
In command mode, use the U key to undo and Ctrl + r to redo. Have a look at http://www.vim.org/htmldoc/undo.html.
CTRL+r
The "r" is lower-case.
Using VsVim for Visual Studio?
I came across this when experimenting with VsVim, which provides bindings for Vim commands in Visual Studio.
I know about Ctrlr in Vim itself, but this particular binding does not work in VsVim (at least not in my setup?).
What does work however, is the command :red. This is a little bit more of a hassle than the above, but it is still fine when you really need it.
Source: Stackoverflow.com