How to “unversion” a file in either svn and/or git

Question

It happens to me all the time. I accidentally version a file, I do not want to be versioned (i.e. developer/machine specific config-files).

If I commit this file, I

Answer 1

In Git, in order to delete it from the tree, but NOT from the working directory, which I think is what you want, you can use the --cached flag, that is:

git rm --cached