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As of late I often find a file named ..vimrc.un~ in the folder in which I edit a file. Where does this file come from?

I am using Vim 7.3 with plugins pathogen, nerdtree, vim-eunuch, vim-surround, vim-sparkup and vim-sensible.

Note: the reason I ask is because I don't know yet what particular component causes it. Otherwise I would be able to dig deeper or ask a more specific question.

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up vote 4 down vote accepted

Those files are used to store information for storing persistent undo information, allowing changes to be undone even after quitting and restarting vim. This is a builtin feature of vim, not from any plugin.

You can get additional information about this from within vim with:

:help undo-persistence
:help 'undofile'
:help 'undodir'
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Which setting and/or command line switch prevents the behavior? Is this the same as -n? Thanks for the answer for now and +1 – 0xC0000022L Mar 5 '13 at 3:46
    
This is controlled by the undofile option, the second help section that I referenced. This is different than the swap files controlled by the -n option. – qqx Mar 5 '13 at 4:00
    
Aaah, thanks. Means vim-sensible is the culprit and not so sensible for me after all ;) – 0xC0000022L Mar 5 '13 at 4:05

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