git-diff(1) Manual Page

This form is to view the changes you made relative to the index (staging area for the next commit). In other words, the differences are what you could tell Git to further add to the index but you still haven’t. You can stage these changes by using git-add(1).

This form is to compare the given two paths on the filesystem. You can omit the --no-index option when running the command in a working tree controlled by Git and at least one of the paths points outside the working tree, or when running the command outside a working tree controlled by Git.

This form is to view the changes you staged for the next commit relative to the named <commit>. Typically you would want comparison with the latest commit, so if you do not give <commit>, it defaults to HEAD. If HEAD does not exist (e.g. unborn branches) and <commit> is not given, it shows all staged changes. --staged is a synonym of --cached.

This form is to view the changes you have in your working tree relative to the named <commit>. You can use HEAD to compare it with the latest commit, or a branch name to compare with the tip of a different branch.

This is to view the changes between two arbitrary <commit>.

This is synonymous to the previous form. If <commit> on one side is omitted, it will have the same effect as using HEAD instead.

This form is to view the changes on the branch containing and up to the second <commit>, starting at a common ancestor of both <commit>. "git diff A...B" is equivalent to "git diff $(git-merge-base A B) B". You can omit any one of <commit>, which has the same effect as using HEAD instead.

This form is to view the differences between the raw contents of two blob objects.

Generate patch (see section on generating patches). This is the default.

Suppress diff output. Useful for commands like git show that show the patch by default, or to cancel the effect of --patch.

Generate diffs with <n> lines of context instead of the usual three. Implies -p.

Generate the raw format.

Synonym for -p --raw.

Spend extra time to make sure the smallest possible diff is produced.

Generate a diff using the "patience diff" algorithm.

Generate a diff using the "histogram diff" algorithm.

Choose a diff algorithm. The variants are as follows:

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.

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.

Output only the last line of the --stat format containing total number of modified files, as well as number of added and deleted lines.

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:

Output a condensed summary of extended header information such as creations, renames and mode changes.

Synonym for -p --stat.

When --raw, --numstat, --name-only or --name-status has been given, do not munge pathnames and use NULs as output field terminators.

Show only names of changed files.

Show only names and status of changed files. See the description of the --diff-filter option on what the status letters mean.

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.

Show colored diff. --color (i.e. without =<when>) is the same as --color=always. <when> can be one of always, never, or auto. It can be changed by the color.ui and color.diff configuration settings.

Turn off colored diff. This can be used to override configuration settings. It is the same as --color=never.

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:

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.

Equivalent to --word-diff=color plus (if a regex was specified) --word-diff-regex=<regex>.

Turn off rename detection, even when the configuration file gives the default to do so.

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.

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.

In addition to --full-index, output a binary diff that can be applied with git-apply.

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>.

Break complete rewrite changes into pairs of delete and create. This serves two purposes:

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%.

Detect copies as well as renames. See also --find-copies-harder. If n is specified, it has the same meaning as for -M<n>.

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.

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 or 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.

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.

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.

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.

Look for differences whose patch text contains added/removed lines that match <regex>.

+    return !regexec(regexp, two->ptr, 1, &regmatch, 0);
...
-    hit = !regexec(regexp, mf2.ptr, 1, &regmatch, 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>.

Treat the <string> given to -S as an extended POSIX regular expression to match.

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.

Swap two inputs; that is, show differences from index or on-disk file to tree contents.

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.

Treat all files as text.

Ignore changes in whitespace at EOL.

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.

Ignore whitespace when comparing lines. This ignores differences even if one line has whitespace where the other line has none.

Ignore changes whose lines are all blank.

Show the context between diff hunks, up to the specified number of lines, thereby fusing hunks that are close to each other.

Show whole surrounding functions of changes.

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.

Disable all output of the program. Implies --exit-code.

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.

Disallow external diff drivers.

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 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.

Show the given source prefix instead of "a/".

Show the given destination prefix instead of "b/".

Do not show any source or destination prefix.

The <paths> parameters, when given, are used to limit the diff to the named paths (you can give directory names and get diff for all files under them).

compares the <tree-ish> and the files on the filesystem.

compares the <tree-ish> and the index.

compares the trees named by the two arguments.

compares the index and the files on the filesystem.