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DIFFSTAT(1)                                                                                      DIFFSTAT(1)



NAME
       diffstat - make histogram from diff-output

SYNOPSIS
       diffstat [options] [file-specifications]

DESCRIPTION
       This program reads the output of diff and displays a histogram of the insertions, deletions, and mod-ifications modifications
       ifications 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, .gz, .lzma, .z or .Z, diffstat will read the uncompressed  data
       via  a  pipe from the corresponding program.  It also can infer the compression type from files piped
       via the standard input.

       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 differences 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.

       -C     add SGR color escape sequences to highlight the histogram.

       -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.

              0  for concise, which shows only the value and a single histogram code for each of insert (+),
                 delete (-) or modify (!)

              1  for normal output,

              2  to fill in the histogram with dots,

              4  to print each value with the histogram.

              Any nonzero value gives a histogram.  The dots and individual values can  be  combined,  e.g.,
              -f6 gives both.

       -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 do not specify this, diffstat  uses  the
              length of the longest filename, after stripping common prefixes.

       -N number
              specify  the  maximum width used for filenames.  Names longer than this limit are truncated on
              the left.  If you do not specify this, diffstat next checks the -n option.

       -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.

       -R     Assume patch was created with old and new files swapped.

       -s     show only the summary line, e.g., number of insertions and deletions.

       -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 col-umns, columns,
              umns, just in case the filenames get too large.

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

       You can override the compiled-in paths of programs used for  decompressing  input  files  by  setting
       environment variables corresponding to their name:

              DIFFSTAT_BZCAT_PATH
              DIFFSTAT_BZIP2_PATH
              DIFFSTAT_COMPRESS_PATH
              DIFFSTAT_GZIP_PATH
              DIFFSTAT_LZCAT_PATH
              DIFFSTAT_PCAT_PATH
              DIFFSTAT_UNCOMPRESS_PATH
              DIFFSTAT_XZ_PATH
              DIFFSTAT_ZCAT_PATH

       However,  diffstat  assumes that the resulting program uses the same command-line options, e.g., "-c"
       to decompress to the standard output.

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

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

       There is no way to obtain a filename from the standard diff between two files with no options.   Con-text Context
       text diffs work, as well as unified diffs.

       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 modi-fied modified
       fied lines for the -m option.

SEE ALSO
       diff(1).

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



                                                                                                 DIFFSTAT(1)