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

As far as I know there is no easy way to remove an added file from versioning control in svn once it is committed.

You will have to save the file somewhere else and delete it from version control. Than copy the backup back again.

It's a version control system after all... ;)