NAME
       diffstat - make histogram from diff-output

USAGE
       diffstat [options] [file-specifications]

SYNOPSIS
       This  program  reads the output of diff and displays a histogram of the
       insertions, deletions, and modifications per-file.

DESCRIPTION
       Diffstat is a program that is useful for reviewing large, complex patch
       files.  It reads from one or more input files which contain output from
       diff, producing a histogram of the total lines changed  for  each  file
       referenced.   If the input filename ends with .bz2, .Z or .gz, diffstat
       will read the uncompressed data via a pipe.