- 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
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, .gz, .lzma, .z or .Z, diffstat
read the uncompressed data via a pipe from the corresponding program. It also
can infer the compression type from files piped via the standard input.
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.
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 "!"
If no filename is given on the command line, diffstat
differences from the standard input.
- ignore lines matching "Binary files XXX and YYY
differ" in the diff
- prefix each line of output with "#", making it a
comment-line for shell scripts.
- add SGR color escape sequences to highlight the
- -D destination
- specify a directory containing files which can be referred
to as the result of applying the differences. diffstat will count
the lines in the corresponding files (after adjusting the names by the
-p option) to obtain the total number of lines in each file.
- The remainder, after subtracting modified and deleted
lines, is shown as "unchanged lines".
- The debug prints a lot of information. It is normally
compiled-in, but can be suppressed.
- -e file
- redirect standard error to file.
- strip out ANSI escape sequences on each line before parsing
the differences. This allows diffstat to be used with
- -f format
- specify the format of the histogram.
- for concise, which shows only the value and a single
histogram code for each of insert (+), delete (-) or modify (!)
- for normal output,
- to fill in the histogram with dots,
- to print each value with the histogram.
- Any nonzero value gives a histogram. The dots and
individual values can be combined, e.g., -f6 gives both.
- prints the usage message and exits.
- suppress the merging of filenames in the report.
- attempt to improve the annotation of "only" files
by looking for a match in the resulting set of files and inferring whether
the file was added or removed.
- This does not currently work in combination with -R
because diffstat maintains only the resulting set of files.
- lists only the filenames. No histogram is generated.
- merge insert/delete counts from each "chunk" of
the patch file to approximate a count of the modified lines.
- -n number
- specify the minimum width used for filenames. If you do not
specify this, diffstat uses the length of the longest filename,
after stripping common prefixes.
- -N number
- specify the maximum width used for filenames. Names longer
than this limit are truncated on the left. If you do not specify this,
diffstat next checks the -n option.
- -o file
- redirect standard output to file.
- -p number
- override the logic that strips common pathnames, simulating
the patch "-p" option.
- If you do not give a -p option, diffstat
examines the differences and strips the common prefix from the pathnames.
This is not what patch does.
- suppress the "0 files changed" message for empty
- -r code
- provides optional rounding of the data shown in histogram,
rather than truncating with error adjustments.
- is the default. No rounding is performed, but accumulated
errors are added to following columns.
- rounds the data
- rounds the data and adjusts the histogram to ensure that it
displays something if there are any differences even if those would
normally be rounded to zero.
- Assume patch was created with old and new files
- show only the summary line, e.g., number of insertions and
- -S source
- this is like the -D option, but specifies a location
where the original files (before applying differences) can be found.
- overrides the histogram, generates output of comma
separated values for the number of changed lines found in the differences
for each file: inserted, deleted and modified.
- If -S or -D options are given, the number of
unchanged lines precedes the number of changes.
- prints the numbers that the -t option would show,
between the pathname and histogram.
- The width of the number of changes is determined by the
largest value (but at least 3). The width given in the -w option is
separate from the width of these numbers.
- suppress the sorting of filenames in the report.
- show progress, e.g., if the output is redirected to a file,
write progress messages to the standard error.
- prints the current version number and exits.
- -w number
- specify the maximum width of the histogram. The histogram
will never be shorter than 10 columns, just in case the filenames get too
runs in a POSIX environment.
You can override the compiled-in paths of programs used for decompressing input
files by setting environment variables corresponding to their name:
assumes that the resulting program uses the same
command-line options, e.g., "-c" to decompress to the standard
is a single binary module, which uses no auxiliary files.
makes a lot of assumptions about the format of diff
There is no way to obtain a filename from the standard diff
files with no options. Context diffs work, as well as unified diffs.
There's no easy way to determine the degree of overlap between the
"before" and "after" displays of modified lines.
simply counts the number of inserted and deleted lines to
approximate modified lines for the -m
Thomas Dickey <email@example.com>.