DIFFSTAT (1)
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.
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
-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.
-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
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
AUTHOR
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