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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

       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

       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  mark-
       ers  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.

       -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

       -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

       -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 adjust-

              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  dif-
                 ferences 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 differ-
              ences) 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

       -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.

       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:


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

       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 is no way to obtain a filename from the standard diff between two files with no options.   Context  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 modified lines  for  the
       -m option.


       Thomas Dickey <>.