diffstat - make histogram from diff-output
USAGE
diffstat [options] [file-specifications]
SYNOPSIS
This program reads the output of diff and displays a his
togram 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 his
togram of the total lines changed for each file refer
enced. If the input filename ends with .Z or .gz, diffs
tat 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 (inser
tion, 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.
-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 pre
fixes.
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
Diffstat runs in a portable UNIX® environment.
FILES
Diffstat is a single binary module, which uses no auxil
iary 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@clark.net).
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