DIFFSTAT(1)                                                        DIFFSTAT(1)


       diffstat - make histogram from diff-output


       diffstat [options] [file-specifications]


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


       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.

       Diffstat recognizes the most popular types of output from diff:

                     preferred by the patch utility.

                     best for readability, but not very compact.

                     not good for much, but simple to generate.

       Diffstat detects the lines that are output by diff to tell which  files
       are  compared,  and  then  counts  the markers in the first column that
       denote the type of change (insertion, deletion or modification).  These
       are shown in the histogram as "+", "-" and "!" characters.

       If no filename is given on the command line, diffstat reads the differ-
       ences from the standard input.


       -c     prefix each line of output with "#", making  it  a  comment-line
              for shell scripts.

       -f format
              specify 0 for concise, 1 for normal output.

       -k     suppress the merging of filenames in the report.

       -n number
              specify  the  minimum  width  used  for filenames.  If you don’t
              specify this, diffstat uses the length of the longest  filename,
              after stripping common prefixes.

       -p number
              override  the logic that strips common pathnames, simulating the
              patch "-p" option.

       -u     suppress the sorting of filenames in the report.

       -V     prints the current version number

       -w number
              specify the maximum width of the histogram.  The plot will never
              be  shorter  than 10 columns, just in case the filenames get too


       Diffstat runs in a portable UNIX® environment.


       Diffstat is a single binary module, which uses no auxiliary files.


       Diffstat makes a lot of assumptions about the format of a diff file.

       There’s no easy way to determine the  degree  of  overlap  between  the
       "before" and "after" displays of modified lines.


       diff (1).


       Thomas Dickey <dickey@invisible-island.net>.


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