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RedHat 9 (Linux i386) - man page for diffstat (redhat section 1)

DIFFSTAT(1)			     General Commands Manual			      DIFFSTAT(1)

NAME
       diffstat - make histogram from diff-output

USAGE
       diffstat [options] [file-specifications]

SYNOPSIS
       This  program  reads  the output of diff and displays a histogram of the insertions, dele-
       tions, and modifications per-file.

DESCRIPTION
       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, .Z or
       .gz, diffstat will read the uncompressed data via a pipe.

       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
       -c     prefix each line of output with "#", making it a comment-line for shell scripts.

       -f format
	      specify 0 for concise, 1 for normal output.

       -k     suppress the merging of filenames in the report.

       -n number
	      specify  the minimum width used for filenames.  If you don't specify this, diffstat
	      uses the length of the longest filename, after stripping common prefixes.

       -p number
	      override the logic that strips common pathnames, simulating the patch "-p" option.

       -u     suppress the sorting of filenames in the report.

       -V     prints the current version number

       -w number
	      specify the maximum width of the histogram.  The plot will never be shorter than 10
	      columns, just in case the filenames get too large.

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

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's	no  easy  way to determine the degree of overlap between the "before" and "after"
       displays of modified lines.

SEE ALSO
       diff (1).

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

										      DIFFSTAT(1)


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