DIFFSTAT(1) DIFFSTAT(1)

NAME
       ddiiffffssttaatt - make histogram from diff-output

UUSSAAGGEE
       ddiiffffssttaatt [options] [file-specifications]

SYNOPSIS
       This  program  reads the output of ddiiffff 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
       ddiiffff, 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:

              unified
                     preferred by the ppaattcchh utility.

              context
                     best for readability, but not very compact.

              default
                     not good for much, but simple to generate.

       DDiiffffssttaatt detects the lines that are output by ddiiffff 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, ddiiffffssttaatt reads the differ-
       ences from the standard input.

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

       -ee file
              redirect standard error to file.

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

       -hh     prints the usage message and exits.

       -kk     suppress the merging of filenames in the report.

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

       -oo file
              redirect standard output to file.

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

       -uu     suppress the sorting of filenames in the report.

       -vv     show progress, e.g., if the output  is  redirected  to  a  file,
              write progress messages to the standard error.

       -VV     prints the current version number and exits.

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

ENVIRONMENT       DDiiffffssttaatt runs in a portable UNIX(R) environment.

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

BUGS
       DDiiffffssttaatt makes a lot of assumptions about the format of a ddiiffff file.

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

SEE ALSO
       diff (1).

AUTHOR
       Thomas Dickey .



                                                                   DIFFSTAT(1)