git-diff-files [<pattern>...]::
compares the index and the files on the filesystem.
-The "git-diff-tree" command begins its ouput by printing the hash of
+The "git-diff-tree" command begins its output by printing the hash of
what is being compared. After that, all the commands print one output
line per changed file.
Status letters C and R are always followed by a score (denoting the
percentage of similarity between the source and target of the move or
-copy), and are the only ones to be so.
+copy). Status letter M may be followed by a score (denoting the
+percentage of dissimilarity) for file rewrites.
<sha1> is shown as all 0's if a file is new on the filesystem
and it is out of sync with the index.