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GIT-DIFF-FILES(1) | Git Manual | GIT-DIFF-FILES(1) |
NAME¶
git-diff-files - Compares files in the working tree and the indexSYNOPSIS¶
git diff-files [-q] [-0|-1|-2|-3|-c|--cc] [<common diff options>] [<path>...]
DESCRIPTION¶
Compares the files in the working tree and the index. When paths are specified, compares only those named paths. Otherwise all entries in the index are compared. The output format is the same as for git diff-index and git diff-tree.OPTIONS¶
-p, -u, --patchGenerate patch (see section on generating
patches).
-s, --no-patch
Suppress diff output. Useful for commands like
git show that show the patch by default, or to cancel the effect of
--patch.
-U<n>, --unified=<n>
Generate diffs with <n> lines of context
instead of the usual three. Implies -p.
--raw
Generate the raw format. This is the
default.
--patch-with-raw
Synonym for -p --raw.
--minimal
Spend extra time to make sure the smallest
possible diff is produced.
--patience
Generate a diff using the "patience
diff" algorithm.
--histogram
Generate a diff using the "histogram
diff" algorithm.
--diff-algorithm={patience|minimal|histogram|myers}
Choose a diff algorithm. The variants are as
follows:
default, myers
For instance, if you configured diff.algorithm variable to a non-default value
and want to use the default one, then you have to use --diff-algorithm=default
option.
--stat[=<width>[,<name-width>[,<count>]]]
The basic greedy diff algorithm. Currently,
this is the default.
minimal
Spend extra time to make sure the smallest
possible diff is produced.
patience
Use "patience diff" algorithm when
generating patches.
histogram
This algorithm extends the patience algorithm
to "support low-occurrence common elements".
Generate a diffstat. By default, as much space
as necessary will be used for the filename part, and the rest for the graph
part. Maximum width defaults to terminal width, or 80 columns if not connected
to a terminal, and can be overridden by <width>. The width of the
filename part can be limited by giving another width <name-width> after
a comma. The width of the graph part can be limited by using
--stat-graph-width=<width> (affects all commands generating a stat
graph) or by setting diff.statGraphWidth=<width> (does not affect git
format-patch). By giving a third parameter <count>, you can limit the
output to the first <count> lines, followed by ... if there are more.
These parameters can also be set individually with --stat-width=<width>,
--stat-name-width=<name-width> and --stat-count=<count>.
--numstat
Similar to --stat, but shows number of added
and deleted lines in decimal notation and pathname without abbreviation, to
make it more machine friendly. For binary files, outputs two - instead of
saying 0 0.
--shortstat
Output only the last line of the --stat format
containing total number of modified files, as well as number of added and
deleted lines.
--dirstat[=<param1,param2,...>]
Output the distribution of relative amount of
changes for each sub-directory. The behavior of --dirstat can be customized by
passing it a comma separated list of parameters. The defaults are controlled
by the diff.dirstat configuration variable (see git-config(1)). The
following parameters are available:
changes
Example: The following will count changed files, while ignoring directories with
less than 10% of the total amount of changed files, and accumulating child
directory counts in the parent directories:
--dirstat=files,10,cumulative.
--summary
Compute the dirstat numbers by counting the
lines that have been removed from the source, or added to the destination.
This ignores the amount of pure code movements within a file. In other words,
rearranging lines in a file is not counted as much as other changes. This is
the default behavior when no parameter is given.
lines
Compute the dirstat numbers by doing the
regular line-based diff analysis, and summing the removed/added line counts.
(For binary files, count 64-byte chunks instead, since binary files have no
natural concept of lines). This is a more expensive --dirstat behavior than
the changes behavior, but it does count rearranged lines within a file as much
as other changes. The resulting output is consistent with what you get from
the other --*stat options.
files
Compute the dirstat numbers by counting the
number of files changed. Each changed file counts equally in the dirstat
analysis. This is the computationally cheapest --dirstat behavior, since it
does not have to look at the file contents at all.
cumulative
Count changes in a child directory for the
parent directory as well. Note that when using cumulative, the sum of the
percentages reported may exceed 100%. The default (non-cumulative) behavior
can be specified with the noncumulative parameter.
<limit>
An integer parameter specifies a cut-off
percent (3% by default). Directories contributing less than this percentage of
the changes are not shown in the output.
Output a condensed summary of extended header
information such as creations, renames and mode changes.
--patch-with-stat
Synonym for -p --stat.
-z
When --raw, --numstat, --name-only or
--name-status has been given, do not munge pathnames and use NULs as output
field terminators.
Without this option, each pathname output will have TAB, LF, double quotes, and
backslash characters replaced with \t, \n, \", and \\, respectively, and
the pathname will be enclosed in double quotes if any of those replacements
occurred.
--name-only
Show only names of changed files.
--name-status
Show only names and status of changed files.
See the description of the --diff-filter option on what the status letters
mean.
--submodule[=<format>]
Specify how differences in submodules are
shown. When --submodule or --submodule=log is given, the log format is
used. This format lists the commits in the range like git-submodule(1)
summary does. Omitting the --submodule option or specifying --submodule=short,
uses the short format. This format just shows the names of the commits
at the beginning and end of the range. Can be tweaked via the diff.submodule
configuration variable.
--color[=<when>]
Show colored diff. --color (i.e. without
=<when>) is the same as --color=always. <when> can
be one of always, never, or auto.
--no-color
Turn off colored diff. It is the same as
--color=never.
--word-diff[=<mode>]
Show a word diff, using the <mode> to
delimit changed words. By default, words are delimited by whitespace; see
--word-diff-regex below. The <mode> defaults to plain, and must
be one of:
color
Note that despite the name of the first mode, color is used to highlight the
changed parts in all modes if enabled.
--word-diff-regex=<regex>
Highlight changed words using only colors.
Implies --color.
plain
Show words as [-removed-] and {+added+}. Makes
no attempts to escape the delimiters if they appear in the input, so the
output may be ambiguous.
porcelain
Use a special line-based format intended for
script consumption. Added/removed/unchanged runs are printed in the usual
unified diff format, starting with a +/-/` ` character at the beginning of the
line and extending to the end of the line. Newlines in the input are
represented by a tilde ~ on a line of its own.
none
Disable word diff again.
Use <regex> to decide what a word is,
instead of considering runs of non-whitespace to be a word. Also implies
--word-diff unless it was already enabled.
Every non-overlapping match of the <regex> is considered a word. Anything
between these matches is considered whitespace and ignored(!) for the purposes
of finding differences. You may want to append |[^[:space:]] to your regular
expression to make sure that it matches all non-whitespace characters. A match
that contains a newline is silently truncated(!) at the newline.
The regex can also be set via a diff driver or configuration option, see
gitattributes(1) or git-config(1). Giving it explicitly
overrides any diff driver or configuration setting. Diff drivers override
configuration settings.
--color-words[=<regex>]
Equivalent to --word-diff=color plus (if a
regex was specified) --word-diff-regex=<regex>.
--no-renames
Turn off rename detection, even when the
configuration file gives the default to do so.
--check
Warn if changes introduce whitespace errors.
What are considered whitespace errors is controlled by core.whitespace
configuration. By default, trailing whitespaces (including lines that solely
consist of whitespaces) and a space character that is immediately followed by
a tab character inside the initial indent of the line are considered
whitespace errors. Exits with non-zero status if problems are found. Not
compatible with --exit-code.
--full-index
Instead of the first handful of characters,
show the full pre- and post-image blob object names on the "index"
line when generating patch format output.
--binary
In addition to --full-index, output a binary
diff that can be applied with git-apply.
--abbrev[=<n>]
Instead of showing the full 40-byte
hexadecimal object name in diff-raw format output and diff-tree header lines,
show only a partial prefix. This is independent of the --full-index option
above, which controls the diff-patch output format. Non default number of
digits can be specified with --abbrev=<n>.
-B[<n>][/<m>], --break-rewrites[=[<n>][/<m>]]
Break complete rewrite changes into pairs of
delete and create. This serves two purposes:
It affects the way a change that amounts to a total rewrite of a file not as a
series of deletion and insertion mixed together with a very few lines that
happen to match textually as the context, but as a single deletion of
everything old followed by a single insertion of everything new, and the
number m controls this aspect of the -B option (defaults to 60%). -B/70%
specifies that less than 30% of the original should remain in the result for
Git to consider it a total rewrite (i.e. otherwise the resulting patch will be
a series of deletion and insertion mixed together with context lines).
When used with -M, a totally-rewritten file is also considered as the source of
a rename (usually -M only considers a file that disappeared as the source of a
rename), and the number n controls this aspect of the -B option (defaults to
50%). -B20% specifies that a change with addition and deletion compared to 20%
or more of the file’s size are eligible for being picked up as a
possible source of a rename to another file.
-M[<n>], --find-renames[=<n>]
Detect renames. If n is specified, it is a
threshold on the similarity index (i.e. amount of addition/deletions compared
to the file’s size). For example, -M90% means Git should consider a
delete/add pair to be a rename if more than 90% of the file hasn’t
changed. Without a % sign, the number is to be read as a fraction, with a
decimal point before it. I.e., -M5 becomes 0.5, and is thus the same as -M50%.
Similarly, -M05 is the same as -M5%. To limit detection to exact renames, use
-M100%. The default similarity index is 50%.
-C[<n>], --find-copies[=<n>]
Detect copies as well as renames. See also
--find-copies-harder. If n is specified, it has the same meaning as for
-M<n>.
--find-copies-harder
For performance reasons, by default, -C option
finds copies only if the original file of the copy was modified in the same
changeset. This flag makes the command inspect unmodified files as candidates
for the source of copy. This is a very expensive operation for large projects,
so use it with caution. Giving more than one -C option has the same
effect.
-D, --irreversible-delete
Omit the preimage for deletes, i.e. print only
the header but not the diff between the preimage and /dev/null. The resulting
patch is not meant to be applied with patch nor git apply; this is solely for
people who want to just concentrate on reviewing the text after the change. In
addition, the output obviously lack enough information to apply such a patch
in reverse, even manually, hence the name of the option.
When used together with -B, omit also the preimage in the deletion part of a
delete/create pair.
-l<num>
The -M and -C options require O(n^2)
processing time where n is the number of potential rename/copy targets. This
option prevents rename/copy detection from running if the number of
rename/copy targets exceeds the specified number.
--diff-filter=[(A|C|D|M|R|T|U|X|B)...[*]]
Select only files that are Added (A), Copied
(C), Deleted (D), Modified (M), Renamed (R), have their type (i.e. regular
file, symlink, submodule, ...) changed (T), are Unmerged (U), are Unknown (X),
or have had their pairing Broken (B). Any combination of the filter characters
(including none) can be used. When * (All-or-none) is added to the
combination, all paths are selected if there is any file that matches other
criteria in the comparison; if there is no file that matches other criteria,
nothing is selected.
-S<string>
Look for differences that change the number of
occurrences of the specified string (i.e. addition/deletion) in a file.
Intended for the scripter’s use.
It is useful when you’re looking for an exact block of code (like a
struct), and want to know the history of that block since it first came into
being: use the feature iteratively to feed the interesting block in the
preimage back into -S, and keep going until you get the very first version of
the block.
-G<regex>
Look for differences whose patch text contains
added/removed lines that match <regex>.
To illustrate the difference between -S<regex> --pickaxe-regex and
-G<regex>, consider a commit with the following diff in the same file:
While git log -G"regexec\(regexp" will show this commit, git log
-S"regexec\(regexp" --pickaxe-regex will not (because the number of
occurrences of that string did not change).
See the pickaxe entry in gitdiffcore(7) for more
information.
--pickaxe-all
+ return !regexec(regexp, two->ptr, 1, ®match, 0); ... - hit = !regexec(regexp, mf2.ptr, 1, ®match, 0);
When -S or -G finds a change, show all the
changes in that changeset, not just the files that contain the change in
<string>.
--pickaxe-regex
Treat the <string> given to -S as an
extended POSIX regular expression to match.
-O<orderfile>
Output the patch in the order specified in the
<orderfile>, which has one shell glob pattern per line. This overrides
the diff.orderfile configuration variable (see git-config(1)). To
cancel diff.orderfile, use -O/dev/null.
-R
Swap two inputs; that is, show differences
from index or on-disk file to tree contents.
--relative[=<path>]
When run from a subdirectory of the project,
it can be told to exclude changes outside the directory and show pathnames
relative to it with this option. When you are not in a subdirectory (e.g. in a
bare repository), you can name which subdirectory to make the output relative
to by giving a <path> as an argument.
-a, --text
Treat all files as text.
--ignore-space-at-eol
Ignore changes in whitespace at EOL.
-b, --ignore-space-change
Ignore changes in amount of whitespace. This
ignores whitespace at line end, and considers all other sequences of one or
more whitespace characters to be equivalent.
-w, --ignore-all-space
Ignore whitespace when comparing lines. This
ignores differences even if one line has whitespace where the other line has
none.
--ignore-blank-lines
Ignore changes whose lines are all
blank.
--inter-hunk-context=<lines>
Show the context between diff hunks, up to the
specified number of lines, thereby fusing hunks that are close to each
other.
-W, --function-context
Show whole surrounding functions of
changes.
--exit-code
Make the program exit with codes similar to
diff(1). That is, it exits with 1 if there were differences and 0 means no
differences.
--quiet
Disable all output of the program. Implies
--exit-code.
--ext-diff
Allow an external diff helper to be executed.
If you set an external diff driver with gitattributes(5), you need to
use this option with git-log(1) and friends.
--no-ext-diff
Disallow external diff drivers.
--textconv, --no-textconv
Allow (or disallow) external text conversion
filters to be run when comparing binary files. See gitattributes(5) for
details. Because textconv filters are typically a one-way conversion, the
resulting diff is suitable for human consumption, but cannot be applied. For
this reason, textconv filters are enabled by default only for
git-diff(1) and git-log(1), but not for
git-format-patch(1) or diff plumbing commands.
--ignore-submodules[=<when>]
Ignore changes to submodules in the diff
generation. <when> can be either "none",
"untracked", "dirty" or "all", which is the
default. Using "none" will consider the submodule modified when it
either contains untracked or modified files or its HEAD differs from the
commit recorded in the superproject and can be used to override any settings
of the ignore option in git-config(1) or gitmodules(5).
When "untracked" is used submodules are not considered dirty when
they only contain untracked content (but they are still scanned for modified
content). Using "dirty" ignores all changes to the work tree of
submodules, only changes to the commits stored in the superproject are shown
(this was the behavior until 1.7.0). Using "all" hides all changes
to submodules.
--src-prefix=<prefix>
Show the given source prefix instead of
"a/".
--dst-prefix=<prefix>
Show the given destination prefix instead of
"b/".
--no-prefix
Do not show any source or destination
prefix.
Diff against the "base" version,
"our branch" or "their branch" respectively. With these
options, diffs for merged entries are not shown.
The default is to diff against our branch (-2) and the cleanly resolved paths.
The option -0 can be given to omit diff output for unmerged entries and just
show "Unmerged".
-c, --cc
This compares stage 2 (our branch), stage 3
(their branch) and the working tree file and outputs a combined diff, similar
to the way diff-tree shows a merge commit with these flags.
-q
Remain silent even on nonexistent files
RAW OUTPUT FORMAT¶
The raw output format from "git-diff-index", "git-diff-tree", "git-diff-files" and "git diff --raw" are very similar.compares the <tree-ish> and the files on
the filesystem.
git-diff-index --cached <tree-ish>
compares the <tree-ish> and the
index.
git-diff-tree [-r] <tree-ish-1> <tree-ish-2> [<pattern>...]
compares the trees named by the two
arguments.
git-diff-files [<pattern>...]
compares the index and the files on the
filesystem.
in-place edit :100644 100644 bcd1234... 0123456... M file0 copy-edit :100644 100644 abcd123... 1234567... C68 file1 file2 rename-edit :100644 100644 abcd123... 1234567... R86 file1 file3 create :000000 100644 0000000... 1234567... A file4 delete :100644 000000 1234567... 0000000... D file5 unmerged :000000 000000 0000000... 0000000... U file6
1.a colon.
2.mode for "src"; 000000 if
creation or unmerged.
3.a space.
4.mode for "dst"; 000000 if
deletion or unmerged.
5.a space.
6.sha1 for "src"; 0{40} if creation
or unmerged.
7.a space.
8.sha1 for "dst"; 0{40} if
creation, unmerged or "look at work tree".
9.a space.
10.status, followed by optional
"score" number.
11.a tab or a NUL when -z option is
used.
12.path for "src"
13.a tab or a NUL when -z option is
used; only exists for C or R.
14.path for "dst"; only exists for C
or R.
15.an LF or a NUL when -z option is
used, to terminate the record.
•A: addition of a file
•C: copy of a file into a new one
•D: deletion of a file
•M: modification of the contents or mode
of a file
•R: renaming of a file
•T: change in the type of the file
•U: file is unmerged (you must complete
the merge before it can be committed)
•X: "unknown" change type
(most probably a bug, please report it)
:100644 100644 5be4a4...... 000000...... M file.c
DIFF FORMAT FOR MERGES¶
"git-diff-tree", "git-diff-files" and "git-diff --raw" can take -c or --cc option to generate diff output also for merge commits. The output differs from the format described above in the following way: 1.there is a colon for each parent
2.there are more "src" modes and
"src" sha1
3.status is concatenated status characters
for each parent
4.no optional "score" number
5.single path, only for "dst"
::100644 100644 100644 fabadb8... cc95eb0... 4866510... MM describe.c
GENERATING PATCHES WITH -P¶
When "git-diff-index", "git-diff-tree", or "git-diff-files" are run with a -p option, "git diff" without the --raw option, or "git log" with the "-p" option, they do not produce the output described above; instead they produce a patch file. You can customize the creation of such patches via the GIT_EXTERNAL_DIFF and the GIT_DIFF_OPTS environment variables. 1.It is preceded with a "git diff"
header that looks like this:
The a/ and b/ filenames are the same unless rename/copy is involved. Especially,
even for a creation or a deletion, /dev/null is not used in place of
the a/ or b/ filenames.
When rename/copy is involved, file1 and file2 show the name of the source file
of the rename/copy and the name of the file that rename/copy produces,
respectively.
diff --git a/file1 b/file2
2.It is followed by one or more extended
header lines:
File modes are printed as 6-digit octal numbers including the file type and file
permission bits.
Path names in extended headers do not include the a/ and b/ prefixes.
The similarity index is the percentage of unchanged lines, and the dissimilarity
index is the percentage of changed lines. It is a rounded down integer,
followed by a percent sign. The similarity index value of 100% is thus
reserved for two equal files, while 100% dissimilarity means that no line from
the old file made it into the new one.
The index line includes the SHA-1 checksum before and after the change. The
<mode> is included if the file mode does not change; otherwise, separate
lines indicate the old and the new mode.
old mode <mode> new mode <mode> deleted file mode <mode> new file mode <mode> copy from <path> copy to <path> rename from <path> rename to <path> similarity index <number> dissimilarity index <number> index <hash>..<hash> <mode>
3.TAB, LF, double quote and backslash
characters in pathnames are represented as \t, \n, \" and \\,
respectively. If there is need for such substitution then the whole pathname
is put in double quotes.
4.All the file1 files in the output refer to
files before the commit, and all the file2 files refer to files after the
commit. It is incorrect to apply each change to each file sequentially. For
example, this patch will swap a and b:
diff --git a/a b/b rename from a rename to b diff --git a/b b/a rename from b rename to a
COMBINED DIFF FORMAT¶
Any diff-generating command can take the ‘-c` or --cc option to produce a combined diff when showing a merge. This is the default format when showing merges with git-diff(1) or git-show(1). Note also that you can give the `-m’ option to any of these commands to force generation of diffs with individual parents of a merge.diff --combined describe.c index fabadb8,cc95eb0..4866510 --- a/describe.c +++ b/describe.c @@@ -98,20 -98,12 +98,20 @@@ return (a_date > b_date) ? -1 : (a_date == b_date) ? 0 : 1; } - static void describe(char *arg) -static void describe(struct commit *cmit, int last_one) ++static void describe(char *arg, int last_one) { + unsigned char sha1[20]; + struct commit *cmit; struct commit_list *list; static int initialized = 0; struct commit_name *n; + if (get_sha1(arg, sha1) < 0) + usage(describe_usage); + cmit = lookup_commit_reference(sha1); + if (!cmit) + usage(describe_usage); + if (!initialized) { initialized = 1; for_each_ref(get_name);
1.It is preceded with a "git diff"
header, that looks like this (when -c option is used):
or like this (when --cc option is used):
diff --combined file
diff --cc file
2.It is followed by one or more extended
header lines (this example shows a merge with two parents):
The mode <mode>,<mode>..<mode> line appears only if at least
one of the <mode> is different from the rest. Extended headers with
information about detected contents movement (renames and copying detection)
are designed to work with diff of two <tree-ish> and are not used by
combined diff format.
index <hash>,<hash>..<hash> mode <mode>,<mode>..<mode> new file mode <mode> deleted file mode <mode>,<mode>
3.It is followed by two-line
from-file/to-file header
Similar to two-line header for traditional unified diff format, /dev/null
is used to signal created or deleted files.
--- a/file +++ b/file
4.Chunk header format is modified to prevent
people from accidentally feeding it to patch -p1. Combined diff format was
created for review of merge commit changes, and was not meant for apply. The
change is similar to the change in the extended index header:
There are (number of parents + 1) @ characters in the chunk header for combined
diff format.
@@@ <from-file-range> <from-file-range> <to-file-range> @@@
OTHER DIFF FORMATS¶
The --summary option describes newly added, deleted, renamed and copied files. The --stat option adds diffstat(1) graph to the output. These options can be combined with other options, such as -p, and are meant for human consumption.arch/{i386 => x86}/Makefile | 4 +--
1 2 README 3 1 arch/{i386 => x86}/Makefile
1.the number of added lines;
2.a tab;
3.the number of deleted lines;
4.a tab;
5.pathname (possibly with rename/copy
information);
6.a newline.
1 2 README NUL 3 1 NUL arch/i386/Makefile NUL arch/x86/Makefile NUL
1.the number of added lines;
2.a tab;
3.the number of deleted lines;
4.a tab;
5.a NUL (only exists if
renamed/copied);
6.pathname in preimage;
7.a NUL (only exists if
renamed/copied);
8.pathname in postimage (only exists if
renamed/copied);
9.a NUL.
GIT¶
Part of the git(1) suite04/08/2014 | Git 1.9.1 |