diffstat man page on ElementaryOS

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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 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, .z or .Z, diffstat
       will read the uncompressed data via a pipe from the corresponding  pro‐
       gram.   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 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.

       -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.

       -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.

       -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‐
	      tions.

       -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® environment.

       You can override the compiled-in paths of programs used for decompress‐
       ing 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 com‐
       mand-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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