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SYNOPSIS
--------
SYNOPSIS
--------
-'git-diff' [ --diff-options ] <tree-ish>{0,2} [<path>...]
+'git-diff' [<common diff options>] <commit>{0,2} [--] [<path>...]
DESCRIPTION
-----------
Show changes between two trees, a tree and the working tree, a
tree and the index file, or the index file and the working tree.
DESCRIPTION
-----------
Show changes between two trees, a tree and the working tree, a
tree and the index file, or the index file and the working tree.
-The combination of what is compared with what is determined by
-the number of trees given to the command.
-* When no <tree-ish> is given, the working tree and the index
- file are compared, using `git-diff-files`.
+'git-diff' [--options] [--] [<path>...]::
-* When one <tree-ish> is given, the working tree and the named
- tree are compared, using `git-diff-index`. The option
- `--index` can be given to compare the index file and
- the named tree.
- `--cached` is a deprecated alias for `--index`. It's use is
- discouraged.
+ 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 gitlink:git-add[1].
++
+If exactly two paths are given, and at least one is untracked,
+compare the two files / directories. This behavior can be
+forced by --no-index.
+
+'git-diff' [--options] --cached [<commit>] [--] [<path>...]::
+
+ 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.
+
+'git-diff' [--options] <commit> [--] [<path>...]::
+
+ 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.
+
+'git-diff' [--options] <commit> <commit> [--] [<path>...]::
+
+ This is to view the changes between two arbitrary
+ <commit>.
+
+'git-diff' [--options] <commit>..<commit> [--] [<path>...]::
+
+ This is synonymous to the previous form. If <commit> on
+ one side is omitted, it will have the same effect as
+ using HEAD instead.
-* When two <tree-ish>s are given, these two trees are compared
- using `git-diff-tree`.
+'git-diff' [--options] <commit>\...<commit> [--] [<path>...]::
+
+ 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.
+
+Just in case if you are doing something exotic, it should be
+noted that all of the <commit> in the above description, except
+for the last two forms that use ".." notations, can be any
+<tree-ish>.
+
+For a more complete list of ways to spell <commit>, see
+"SPECIFYING REVISIONS" section in gitlink:git-rev-parse[1].
+However, "diff" is about comparing two _endpoints_, not ranges,
+and the range notations ("<commit>..<commit>" and
+"<commit>\...<commit>") do not mean a range as defined in the
+"SPECIFYING RANGES" section in gitlink:git-rev-parse[1].
OPTIONS
-------
OPTIONS
-------
---diff-options::
- '--diff-options' are passed to the `git-diff-files`,
- `git-diff-index`, and `git-diff-tree` commands. See the
- documentation for these commands for description.
+include::diff-options.txt[]
<path>...::
<path>...::
- The <path> arguments are also passed to `git-diff-\*`
- commands.
+ 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).
+Output format
+-------------
+include::diff-format.txt[]
EXAMPLES
--------
EXAMPLES
--------
+
------------
$ git diff <1>
+
------------
$ git diff <1>
-$ git diff --index <2>
+$ git diff --cached <2>
$ git diff HEAD <3>
------------
+
$ git diff HEAD <3>
------------
+
-<1> changes in the working tree since your last git-update-index.
-<2> changes between the index and your last commit; what you
+<1> Changes in the working tree not yet staged for the next commit.
+<2> Changes between the index and your last commit; what you
would be committing if you run "git commit" without "-a" option.
would be committing if you run "git commit" without "-a" option.
-<3> changes in the working tree since your last commit; what you
+<3> Changes in the working tree since your last commit; what you
would be committing if you run "git commit -a"
Comparing with arbitrary commits::
would be committing if you run "git commit -a"
Comparing with arbitrary commits::
$ git diff HEAD^ HEAD <3>
------------
+
$ git diff HEAD^ HEAD <3>
------------
+
-<1> instead of using the tip of the current branch, compare with the
+<1> Instead of using the tip of the current branch, compare with the
tip of "test" branch.
tip of "test" branch.
-<2> instead of comparing with the tip of "test" branch, compare with
+<2> Instead of comparing with the tip of "test" branch, compare with
the tip of the current branch, but limit the comparison to the
file "test".
the tip of the current branch, but limit the comparison to the
file "test".
-<3> compare the version before the last commit and the last commit.
+<3> Compare the version before the last commit and the last commit.
+Comparing branches::
++
+------------
+$ git diff topic master <1>
+$ git diff topic..master <2>
+$ git diff topic...master <3>
+------------
++
+<1> Changes between the tips of the topic and the master branches.
+<2> Same as above.
+<3> Changes that occurred on the master branch since when the topic
+branch was started off it.
Limiting the diff output::
+
------------
$ git diff --diff-filter=MRC <1>
Limiting the diff output::
+
------------
$ git diff --diff-filter=MRC <1>
-$ git diff --name-status -r <2>
+$ git diff --name-status <2>
$ git diff arch/i386 include/asm-i386 <3>
------------
+
$ git diff arch/i386 include/asm-i386 <3>
------------
+
-<1> show only modification, rename and copy, but not addition
+<1> Show only modification, rename and copy, but not addition
nor deletion.
nor deletion.
-<2> show only names and the nature of change, but not actual
-diff output. --name-status disables usual patch generation
-which in turn also disables recursive behavior, so without -r
-you would only see the directory name if there is a change in a
-file in a subdirectory.
-<3> limit diff output to named subtrees.
+<2> Show only names and the nature of change, but not actual
+diff output.
+<3> Limit diff output to named subtrees.
Munging the diff output::
+
Munging the diff output::
+
$ git diff -R <2>
------------
+
$ git diff -R <2>
------------
+
-<1> spend extra cycles to find renames, copies and complete
+<1> Spend extra cycles to find renames, copies and complete
rewrites (very expensive).
rewrites (very expensive).
-<2> output diff in reverse.
+<2> Output diff in reverse.
Author
Author
GIT
---
Part of the gitlink:git[7] suite
GIT
---
Part of the gitlink:git[7] suite
-