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How can I disable persistence undo in Vim 7.3?

I found that sometime, after doing some code modification, I want to go back to the state that i just open that file. But if have such persistence undo option, when i pressing u , it will undo more than i want.

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Pressing U should step back through the edit tree. like ctrl and z in word. I'm not sure I understand, if you press U is it doing too much in which case are you sure you have the undo buffer active? – David McGowan Sep 9 '12 at 13:17
the persistence undo will also save my edit history after i close the file. so when i reopen the file again, when i press U, it can undo my previous change I close the file. that is not i want :( – Kit Ho Sep 9 '12 at 13:26

2 Answers

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Persistent undo is an opt-in feature. If you don't want it simply remove the related settings that you have put in your ~/.vimrc.

Removing set undofile and manually deleting the undo files should be enough.

See :help persistent-undo.

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A solution without disabling persistent undo would be the :ea 1f command. This rewinds the undo history to where it was the last time the file was saved. (You can keep executing it to go to each previous save spot, or supply a number other than 1 to skip several saves.)

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