diffstat - make histogram from diff-output
diffstat [options] [file-specifications]
This program reads the output of diff and displays a histogram of the
insertions, deletions, and modifications per-file.
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:
preferred by the patch utility.
best for readability, but not very compact.
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 differ-
ences from the standard input.
-c prefix each line of output with "#", making it a comment-line
for shell scripts.
specify 0 for concise, 1 for normal output.
-k suppress the merging of filenames in the report.
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.
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
specify the maximum width of the histogram. The plot will never
be shorter than 10 columns, just in case the filenames get too
Diffstat runs in a portable UNIX(R) environment.
Diffstat is a single binary module, which uses no auxiliary files.
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.
Thomas Dickey <firstname.lastname@example.org>.