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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, 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)