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DIFFSTAT(1)		    General Commands Manual		   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  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",	".gz", ".lzma",	".xz", ".z" or
       ".Z", diffstat will read	the uncompressed data via a pipe from the cor-
       responding  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:

		 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 markers in the first column that de-
       note 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.

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

       -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 suppressed.

       -e file
	      redirect standard	error to file.

       -E     strip  out ANSI escape sequences on each line before parsing the
	      differences.  This allows	diffstat to be used with colordiff.

       -f format
	      specify the format of the	histogram.

	      0	 for concise, which shows only the value  and  a  single  his-
		 togram	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.

       -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.

	      If  you  do  not give a -p option, diffstat examines the differ-
	      ences and	strips the common prefix from the pathnames.  This  is
	      not what patch does.

       -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 dele-

       -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 for the number of changed lines found in the  differences
	      for each file: inserted, deleted and modified.

	      If  -S  or  -D  options are given, the number of unchanged lines
	      precedes the number of changes.

       -T     prints the numbers that the -t option would  show,  between  the
	      pathname and histogram.

	      The  width of the	number of changes is determined	by the largest
	      value (but at least 3).  The width given in  the	-w  option  is
	      separate from the	width of these numbers.

       -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.

	      The default is 80	columns, unless	the output is to  a  terminal.
	      In that case, the	default	width is the terminal's	width.

       Diffstat	runs in	a POSIX	environment.

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


       However,	diffstat assumes that the resulting program uses the same com-
       mand-line options, e.g.,	"-c" to	decompress 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 diff's output.

       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 "be-
       fore" and "after" displays of modified lines.  diffstat	simply	counts
       the  number of inserted and deleted lines to approximate	modified lines
       for the -m option.

       diff(1),	patch(1).

       Thomas Dickey <>.



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