bos@144: $ \textbf{cat file}
bos@144: original content
bos@144: $ \textbf{echo unwanted change >> file}
bos@144: $ \textbf{hg diff file}
bos@144: diff -r  file
bos@144: 
bos@144: 
bos@144: @@ -1,1 +1,2 @@ original content
bos@144:  original content
bos@144: +unwanted change