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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, dele-
       tions, 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, .gz, .lzma, .z or .Z, diffstat will read the  uncom-
       pressed 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  "!"  charac-
       ters.

       If no filename is given on the command line, diffstat reads the differences from the stan-
       dard 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".

       -d     The debug prints a lot of information.  It is normally compiled-in, but can be sup-
	      pressed.

       -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  com-
	      bined, e.g., -f6 gives both.

       -h     prints the usage message and exits.

       -k     suppress the merging of filenames in the report.

       -K     attempt  to  improve  the  annotation of "only" files by looking for a match in the
	      resulting set of files and inferring whether the file was added or removed.

	      This does not currently work in combination with -R because diffstat maintains only
	      the resulting set of files.

       -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 columns, 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.  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.

SEE ALSO
       diff(1).

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

										      DIFFSTAT(1)
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