The diff command compares files line by line. Diffstat reads the output
of the diff command and displays a histogram of the insertions, deletions
and modifications in each file. Diffstat is commonly used to provide
a summary of the changes in large, complex patch files.

Install diffstat if you need a program which provides a summary of the
diff command's output. You'll need to also install diffutils.

-rwxr-xr-x    1 root    root            14252 déc 11  2003 /usr/bin/diffstat
drwxr-xr-x    2 root    root                0 déc 11  2003 /usr/share/doc/diffstat-1.34
-r--r--r--    1 root    root             3771 nov  9  2003 /usr/share/doc/diffstat-1.34/CHANGES
-rw-r--r--    1 root    root             2016 déc 11  2003 /usr/share/man/man1/diffstat.1.bz2