$ git diff-tree -p -m master
-176b998f5d647cbd77a9d8acf4531e930754d16d
+59d314ad6f356dd08601a4cd5e530381da3e3c64
diff --git a/dir/sub b/dir/sub
index cead32e..992913c 100644
--- a/dir/sub
+A
+B
+C
-176b998f5d647cbd77a9d8acf4531e930754d16d
+59d314ad6f356dd08601a4cd5e530381da3e3c64
diff --git a/dir/sub b/dir/sub
index 7289e35..992913c 100644
--- a/dir/sub