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One of the great features of version control is that I can easily revert back to a known good state. I can do this in Subversion with the following command:

% svn revert -R .

However, if I have new files that are not in Subversion, this command will not delete them. Here is a fun ruby one liner to remove those files:

svn st | ruby -ne 'File.delete($_[1..-1].strip) if $_.match(/^\?/)'

This command loops over svn status and deletes all files from lines that start with ?.