bos@196: $ \textbf{hg tag -r 1 v1.1}
bos@196: $ \textbf{hg tags}
bos@196: tip                                
bos@196: v1.1                               
bos@196: $ \textbf{hg tag -r 2 v1.1}
bos@196: abort: a tag named v1.1 already exists (use -f to force)
bos@196: $ \textbf{hg tag -f -r 2 v1.1}
bos@196: $ \textbf{hg tags}
bos@196: tip                                
bos@196: v1.1