foozy@708: $ \textbf{cat file}
foozy@708: original content
foozy@708: $ \textbf{echo unwanted change >> file}
foozy@708: $ \textbf{hg diff file}
foozy@708: diff -r  file
foozy@708: 
foozy@708: 
foozy@708: @@ -1,1 +1,2 @@ original content
foozy@708:  original content
foozy@708: +unwanted change