user privilege within vi?

Possible Duplicate:
How does the vim “write with sudo” trick work?

This situation always happen: I try to vi a configuration file but I forget to add sudo before it, and when I try to save it, vi prompt me that this file is read only.

How can I change to super-user privilege without get out of vi and re-edit that file?

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这适用于vi和vim中的我：

:w !sudo tee %

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cmap w!! %!sudo tee > /dev/null %

Add the line in ~ /. Vimrc and do: w!! to keep with sudo

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通常我将它保存在temp ：w /tmp/foo.txt然后sudo cp。

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