Undoing Changes

The commands to undo and redo changes are:

q:

undo

Q:

redo

You can also move back/forward in the history of changes. For example, to set the state of the file as it was one hour ago or how it was one hour after, use:

:earlier 1h
:later 1h

Time can be specified with a number and s, m, h or d for seconds, minutes, hours or days respectively.