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.
-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 form is to view the changes between two <commit>,
+ for example, tips of two branches.
+
+Just in case if you are doing something exotic, it should be
+noted that all of the <commit> in the above description 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].
-* When two <tree-ish>s are given, these two trees are compared
- using `git-diff-tree`.
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>...::
- 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).
EXAMPLES
+
------------
$ git diff <1>
-$ git diff --index <2>
+$ git diff --cached <2>
$ git diff HEAD <3>
------------
+
-<1> changes in the working tree since your last git-update-index.
+<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.
<3> changes in the working tree since your last commit; what you