diffstat(1) [redhat man page]

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, deletions, 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 "!" characters.

       If no filename is given on the command line, diffstat reads the differences from the standard 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)

Check Out this Related Man Page

GENDIFF(1)                                                    General Commands Manual                                                   GENDIFF(1)

NAME

       gendiff - utility to aid in error-free diff file generation

SYNOPSIS

       gendiff <directory> <diff-extension>

DESCRIPTION

       gendiff  is  a  rather  simple script which aids in generating a diff file from a single directory.  It takes a directory name and a "diff-
       extension" as its only arguments.  The diff extension should be a unique sequence of characters added to the end of all  original,  unmodi-
       fied files.  The output of the program is a diff file which may be applied with the patch program to recreate the changes.

       The  usual  sequence  of events for creating a diff is to create two identical directories, make changes in one directory, and then use the
       diff utility to create a list of differences between the two.  Using gendiff eliminates the need for the  extra,  original  and  unmodified
       directory copy.  Instead, only the individual files that are modified need to be saved.

       Before editing a file, copy the file, appending the extension you have chosen to the filename.  I.e. if you were going to edit somefile.cpp
       and have chosen the extension "fix", copy it to somefile.cpp.fix before editing it.  Then edit the first copy (somefile.cpp).

       After editing all the files you need to edit in this fashion, enter the directory one level above where your source code resides, and  then
       type

           $ gendiff somedirectory .fix > mydiff-fix.patch

       You should redirect the output to a file (as illustrated) unless you want to see the results on stdout.

SEE ALSO

       diff(1), patch(1)

AUTHOR

       Marc Ewing <marc@redhat.com>

4th Berkeley Distribution                                         Mon Jan 10 2000                                                       GENDIFF(1)

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diffstat(1) [redhat man page]

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