diffstat

SYNOPSIS
       diffstat [options] [file-specifications]

DESCRIPTION
       This  program  reads the output of diff and displays a histogram of the
       insertions, deletions, and modifications per-file.  Diffstat is a  pro-
       gram 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 from the corresponding program.

       Diffstat recognizes the most popular types of output from diff:

              unified
                     preferred by the patch utility.

              context
                     best for readability, but not very compact.

              default
                     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.

OPTIONS
       -b     ignore  lines  matching "Binary files XXX and YYY differ" in the
              diff

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

       -D destination
              specify a directory containing files which can be referred to as
              the result of applying the differences.  diffstat will count the
              lines  in  the corresponding files (after adjusting the names by
              the -p option) to obtain the total number of lines in each file.

              The remainder, after subtracting modified and deleted lines,  is
              shown as "unchanged lines".

       -e file
              redirect standard error to file.

       -f format
              specify the format of the histogram.

       -h     prints the usage message and exits.

       -k     suppress the merging of filenames in the report.

       -l     lists only the filenames.  No histogram is generated.

       -m     merge  insert/delete  counts from each "chunk" of the patch file
              to approximate a count of the modified lines.

       -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.

       -o file
              redirect standard output to file.

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

       -q     suppress the "0 files changed" message for empty diffs.

       -r  code
              provides  optional  rounding  of  the  data  shown in histogram,
              rather than truncating with error adjustments.

              0  is the default.  No rounding is  performed,  but  accumulated
                 errors are added to following columns.

              1  rounds the data

              2  rounds  the  data and adjusts the histogram to ensure that it
                 displays something if there are any differences even if those
                 would normally be rounded to zero.

       -S source
              this  is  like the -D option, but specifies a location where the
              original files (before applying differences) can be found.

       -t     overrides the histogram, generates  output  of  comma  separated
              values.

       -u     suppress the sorting of filenames in the report.

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

       -V     prints the current version number and exits.

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

       There's  no  easy  way  to  determine the degree of overlap between the
       "before" and "after"  displays  of  modified  lines.   diffstat  simply
       counts the number of inserted and deleted lines to approximate modified
       lines for the -m option.

SEE ALSO
       diff (1).

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



                                                                   DIFFSTAT(1)