NAME
----
-git-diff - Some git command not yet documented.
+git-diff - Show changes between commits, commit and working tree, etc
SYNOPSIS
--------
-'git-diff' [ --option ] <args>...
+'git-diff' [ --diff-options ] <tree-ish>{0,2} [<path>...]
DESCRIPTION
-----------
-Does something not yet documented.
+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`.
+
+* When one <tree-ish> is given, the working tree and the named
+ tree are compared, using `git-diff-index`. The option
+ `--cached` can be given to compare the index file and
+ the named tree.
+
+* When two <tree-ish>s are given, these two trees are compared
+ using `git-diff-tree`.
OPTIONS
-------
---option::
- Some option not yet documented.
+--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.
+
+<path>...::
+ The <path> arguments are also passed to `git-diff-\*`
+ commands.
+
+
+EXAMPLES
+--------
+
+Various ways to check your working tree::
++
+------------
+$ git diff <1>
+$ git diff --cached <2>
+$ 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
+would be committing if you run "git commit" without "-a" option.
+<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::
++
+------------
+$ git diff test <1>
+$ git diff HEAD -- ./test <2>
+$ git diff HEAD^ HEAD <3>
+------------
++
+<1> instead of using the tip of the current branch, compare with the
+tip of "test" branch.
+<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".
+<3> compare the version before the last commit and the last commit.
+
+
+Limiting the diff output::
++
+------------
+$ git diff --diff-filter=MRC <1>
+$ git diff --name-status -r <2>
+$ git diff arch/i386 include/asm-i386 <3>
+------------
++
+<1> show only modification, rename and copy, but not addition
+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.
-<args>...::
- Some argument not yet documented.
+Munging the diff output::
++
+------------
+$ git diff --find-copies-harder -B -C <1>
+$ git diff -R <2>
+------------
++
+<1> spend extra cycles to find renames, copies and complete
+rewrites (very expensive).
+<2> output diff in reverse.
Author
GIT
---
-Part of the link:git.html[git] suite
+Part of the gitlink:git[7] suite