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GIT-DIFF-TREE(1)		  Git Manual		      GIT-DIFF-TREE(1)



NAME
       git-diff-tree - Compares the content and mode of blobs found via two
       tree objects

SYNOPSIS
       git diff-tree [--stdin] [-m] [-s] [-v] [--no-commit-id] [--pretty]
		     [-t] [-r] [-c | --cc] [--combined-all-paths] [--root] [--merge-base]
		     [<common-diff-options>] <tree-ish> [<tree-ish>] [<path>...]


DESCRIPTION
       Compares the content and mode of the blobs found via two tree objects.

       If there is only one <tree-ish> given, the commit is compared with its
       parents (see --stdin below).

       Note that git diff-tree can use the tree encapsulated in a commit
       object.

OPTIONS
       -p, -u, --patch
	   Generate 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 --patch.

       --output=<file>
	   Output to a specific file instead of stdout.

       --output-indicator-new=<char>, --output-indicator-old=<char>,
       --output-indicator-context=<char>
	   Specify the character used to indicate new, old or context lines in
	   the generated patch. Normally they are +, - and ' ' respectively.

       --raw
	   Generate the diff in raw format. This is the default.

       --patch-with-raw
	   Synonym for -p --raw.

       --indent-heuristic
	   Enable the heuristic that shifts diff hunk boundaries to make
	   patches easier to read. This is the default.

       --no-indent-heuristic
	   Disable the indent heuristic.

       --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.

       --anchored=<text>
	   Generate a diff using the "anchored diff" algorithm.

	   This option may be specified more than once.

	   If a line exists in both the source and destination, exists only
	   once, and starts with this text, this algorithm attempts to prevent
	   it from appearing as a deletion or addition in the output. It uses
	   the "patience diff" algorithm internally.

       --diff-algorithm={patience|minimal|histogram|myers}
	   Choose a diff algorithm. The variants are as follows:

	   default, myers
	       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".

	   For instance, if you configured the 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>]]]
	   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>.

       --compact-summary
	   Output a condensed summary of extended header information such as
	   file creations or deletions ("new" or "gone", optionally "+l" if
	   it's a symlink) and mode changes ("+x" or "-x" for adding or
	   removing executable bit respectively) in diffstat. The information
	   is put between the filename part and the graph part. Implies
	   --stat.

       --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.

       -X[<param1,param2,...>], --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
	       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.

	   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.

       --cumulative
	   Synonym for --dirstat=cumulative

       --dirstat-by-file[=<param1,param2>...]
	   Synonym for --dirstat=files,param1,param2...

       --summary
	   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, pathnames with "unusual" characters are quoted
	   as explained for the configuration variable core.quotePath (see
	   git-config(1)).

       --name-only
	   Show only names of changed files. The file names are often encoded
	   in UTF-8. For more information see the discussion about encoding in
	   the git-log(1) manual page.

       --name-status
	   Show only names and status of changed files. See the description of
	   the --diff-filter option on what the status letters mean. Just like
	   --name-only the file names are often encoded in UTF-8.

       --submodule[=<format>]
	   Specify how differences in submodules are shown. When specifying
	   --submodule=short the short format is used. This format just shows
	   the names of the commits at the beginning and end of the range.
	   When --submodule or --submodule=log is specified, the log format is
	   used. This format lists the commits in the range like git-
	   submodule(1)summary does. When --submodule=diff is specified, the
	   diff format is used. This format shows an inline diff of the
	   changes in the submodule contents between the commit range.
	   Defaults to diff.submodule or the short format if the config option
	   is unset.

       --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.

       --color-moved[=<mode>]
	   Moved lines of code are colored differently. The <mode> defaults to
	   no if the option is not given and to zebra if the option with no
	   mode is given. The mode must be one of:

	   no
	       Moved lines are not highlighted.

	   default
	       Is a synonym for zebra. This may change to a more sensible mode
	       in the future.

	   plain
	       Any line that is added in one location and was removed in
	       another location will be colored with color.diff.newMoved.
	       Similarly color.diff.oldMoved will be used for removed lines
	       that are added somewhere else in the diff. This mode picks up
	       any moved line, but it is not very useful in a review to
	       determine if a block of code was moved without permutation.

	   blocks
	       Blocks of moved text of at least 20 alphanumeric characters are
	       detected greedily. The detected blocks are painted using either
	       the color.diff.{old,new}Moved color. Adjacent blocks cannot be
	       told apart.

	   zebra
	       Blocks of moved text are detected as in blocks mode. The blocks
	       are painted using either the color.diff.{old,new}Moved color or
	       color.diff.{old,new}MovedAlternative. The change between the
	       two colors indicates that a new block was detected.

	   dimmed-zebra
	       Similar to zebra, but additional dimming of uninteresting parts
	       of moved code is performed. The bordering lines of two adjacent
	       blocks are considered interesting, the rest is uninteresting.
	       dimmed_zebra is a deprecated synonym.

       --no-color-moved
	   Turn off move detection. This can be used to override configuration
	   settings. It is the same as --color-moved=no.

       --color-moved-ws=<modes>
	   This configures how whitespace is ignored when performing the move
	   detection for --color-moved. These modes can be given as a comma
	   separated list:

	   no
	       Do not ignore whitespace when performing move detection.

	   ignore-space-at-eol
	       Ignore changes in whitespace at EOL.

	   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.

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

	   allow-indentation-change
	       Initially ignore any whitespace in the move detection, then
	       group the moved code blocks only into a block if the change in
	       whitespace is the same per line. This is incompatible with the
	       other modes.

       --no-color-moved-ws
	   Do not ignore whitespace when performing move detection. This can
	   be used to override configuration settings. It is the same as
	   --color-moved-ws=no.

       --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
	       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.

	   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>
	   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.

	   For example, --word-diff-regex=.  will treat each character as a
	   word and, correspondingly, show differences character by character.

	   The regex can also be set via a diff driver or configuration
	   option, see gitattributes(5) 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.

       --[no-]rename-empty
	   Whether to use empty blobs as rename source.

       --check
	   Warn if changes introduce conflict markers or whitespace errors.
	   What are considered whitespace errors is controlled by
	   core.whitespace configuration. By default, trailing whitespaces
	   (including lines that consist solely 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.

       --ws-error-highlight=<kind>
	   Highlight whitespace errors in the context, old or new lines of the
	   diff. Multiple values are separated by comma, none resets previous
	   values, default reset the list to new and all is a shorthand for
	   old,new,context. When this option is not given, and the
	   configuration variable diff.wsErrorHighlight is not set, only
	   whitespace errors in new lines are highlighted. The whitespace
	   errors are colored with color.diff.whitespace.

       --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. Implies --patch.

       --abbrev[=<n>]
	   Instead of showing the full 40-byte hexadecimal object name in
	   diff-raw format output and diff-tree header lines, show the
	   shortest prefix that is at least <n> hexdigits long that uniquely
	   refers the object. In diff-patch output format, --full-index takes
	   higher precedence, i.e. if --full-index is specified, full blob
	   names will be shown regardless of --abbrev. 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 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 lacks 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 involve some preliminary steps that can
	   detect subsets of renames/copies cheaply, followed by an exhaustive
	   fallback portion that compares all remaining unpaired destinations
	   to all relevant sources. (For renames, only remaining unpaired
	   sources are relevant; for copies, all original sources are
	   relevant.) For N sources and destinations, this exhaustive check is
	   O(N^2). This option prevents the exhaustive portion of rename/copy
	   detection from running if the number of source/destination files
	   involved exceeds the specified number. Defaults to
	   diff.renameLimit. Note that a value of 0 is treated as unlimited.

       --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.

	   Also, these upper-case letters can be downcased to exclude. E.g.
	   --diff-filter=ad excludes added and deleted paths.

	   Note that not all diffs can feature all types. For instance, copied
	   and renamed entries cannot appear if detection for those types is
	   disabled.

       -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.

	   Binary files are searched as well.

       -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:

	       +    return frotz(nitfol, two->ptr, 1, 0);
	       ...
	       -    hit = frotz(nitfol, mf2.ptr, 1, 0);

	   While git log -G"frotz\(nitfol" will show this commit, git log
	   -S"frotz\(nitfol" --pickaxe-regex will not (because the number of
	   occurrences of that string did not change).

	   Unless --text is supplied patches of binary files without a
	   textconv filter will be ignored.

	   See the pickaxe entry in gitdiffcore(7) for more information.

       --find-object=<object-id>
	   Look for differences that change the number of occurrences of the
	   specified object. Similar to -S, just the argument is different in
	   that it doesn't search for a specific string but for a specific
	   object id.

	   The object can be a blob or a submodule commit. It implies the -t
	   option in git-log to also find trees.

       --pickaxe-all
	   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>
	   Control the order in which files appear in the output. This
	   overrides the diff.orderFile configuration variable (see git-
	   config(1)). To cancel diff.orderFile, use -O/dev/null.

	   The output order is determined by the order of glob patterns in
	   <orderfile>. All files with pathnames that match the first pattern
	   are output first, all files with pathnames that match the second
	   pattern (but not the first) are output next, and so on. All files
	   with pathnames that do not match any pattern are output last, as if
	   there was an implicit match-all pattern at the end of the file. If
	   multiple pathnames have the same rank (they match the same pattern
	   but no earlier patterns), their output order relative to each other
	   is the normal order.

	   <orderfile> is parsed as follows:

	   o   Blank lines are ignored, so they can be used as separators for
	       readability.

	   o   Lines starting with a hash ("#") are ignored, so they can be
	       used for comments. Add a backslash ("\") to the beginning of
	       the pattern if it starts with a hash.

	   o   Each other line contains a single pattern.

	   Patterns have the same syntax and semantics as patterns used for
	   fnmatch(3) without the FNM_PATHNAME flag, except a pathname also
	   matches a pattern if removing any number of the final pathname
	   components matches the pattern. For example, the pattern "foo*bar"
	   matches "fooasdfbar" and "foo/bar/baz/asdf" but not "foobarx".

       --skip-to=<file>, --rotate-to=<file>
	   Discard the files before the named <file> from the output (i.e.
	   skip to), or move them to the end of the output (i.e.  rotate to).
	   These were invented primarily for use of the git difftool command,
	   and may not be very useful otherwise.

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

       --relative[=<path>], --no-relative
	   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.
	   --no-relative can be used to countermand both diff.relative config
	   option and previous --relative.

       -a, --text
	   Treat all files as text.

       --ignore-cr-at-eol
	   Ignore carriage-return at the end of line when doing a comparison.

       --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.

       -I<regex>, --ignore-matching-lines=<regex>
	   Ignore changes whose all lines match <regex>. This option may be
	   specified more than once.

       --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. Defaults
	   to diff.interHunkContext or 0 if the config option is unset.

       -W, --function-context
	   Show whole function as context lines for each change. The function
	   names are determined in the same way as git diff works out patch
	   hunk headers (see Defining a custom hunk-header in
	   gitattributes(5)).

       --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.

       --line-prefix=<prefix>
	   Prepend an additional prefix to every line of output.

       --ita-invisible-in-index
	   By default entries added by "git add -N" appear as an existing
	   empty file in "git diff" and a new file in "git diff --cached".
	   This option makes the entry appear as a new file in "git diff" and
	   non-existent in "git diff --cached". This option could be reverted
	   with --ita-visible-in-index. Both options are experimental and
	   could be removed in future.

       For more detailed explanation on these common options, see also
       gitdiffcore(7).

       <tree-ish>
	   The id of a tree object.

       <path>...
	   If provided, the results are limited to a subset of files matching
	   one of the provided pathspecs.

       -r
	   recurse into sub-trees

       -t
	   show tree entry itself as well as subtrees. Implies -r.

       --root
	   When --root is specified the initial commit will be shown as a big
	   creation event. This is equivalent to a diff against the NULL tree.

       --merge-base
	   Instead of comparing the <tree-ish>s directly, use the merge base
	   between the two <tree-ish>s as the "before" side. There must be two
	   <tree-ish>s given and they must both be commits.

       --stdin
	   When --stdin is specified, the command does not take <tree-ish>
	   arguments from the command line. Instead, it reads lines containing
	   either two <tree>, one <commit>, or a list of <commit> from its
	   standard input. (Use a single space as separator.)

	   When two trees are given, it compares the first tree with the
	   second. When a single commit is given, it compares the commit with
	   its parents. The remaining commits, when given, are used as if they
	   are parents of the first commit.

	   When comparing two trees, the ID of both trees (separated by a
	   space and terminated by a newline) is printed before the
	   difference. When comparing commits, the ID of the first (or only)
	   commit, followed by a newline, is printed.

	   The following flags further affect the behavior when comparing
	   commits (but not trees).

       -m
	   By default, git diff-tree --stdin does not show differences for
	   merge commits. With this flag, it shows differences to that commit
	   from all of its parents. See also -c.

       -s
	   By default, git diff-tree --stdin shows differences, either in
	   machine-readable form (without -p) or in patch form (with -p). This
	   output can be suppressed. It is only useful with -v flag.

       -v
	   This flag causes git diff-tree --stdin to also show the commit
	   message before the differences.

       --pretty[=<format>], --format=<format>
	   Pretty-print the contents of the commit logs in a given format,
	   where <format> can be one of oneline, short, medium, full, fuller,
	   reference, email, raw, format:<string> and tformat:<string>. When
	   <format> is none of the above, and has %placeholder in it, it acts
	   as if --pretty=tformat:<format> were given.

	   See the "PRETTY FORMATS" section for some additional details for
	   each format. When =<format> part is omitted, it defaults to medium.

	   Note: you can specify the default pretty format in the repository
	   configuration (see git-config(1)).

       --abbrev-commit
	   Instead of showing the full 40-byte hexadecimal commit object name,
	   show a prefix that names the object uniquely. "--abbrev=<n>" (which
	   also modifies diff output, if it is displayed) option can be used
	   to specify the minimum length of the prefix.

	   This should make "--pretty=oneline" a whole lot more readable for
	   people using 80-column terminals.

       --no-abbrev-commit
	   Show the full 40-byte hexadecimal commit object name. This negates
	   --abbrev-commit, either explicit or implied by other options such
	   as "--oneline". It also overrides the log.abbrevCommit variable.

       --oneline
	   This is a shorthand for "--pretty=oneline --abbrev-commit" used
	   together.

       --encoding=<encoding>
	   Commit objects record the character encoding used for the log
	   message in their encoding header; this option can be used to tell
	   the command to re-code the commit log message in the encoding
	   preferred by the user. For non plumbing commands this defaults to
	   UTF-8. Note that if an object claims to be encoded in X and we are
	   outputting in X, we will output the object verbatim; this means
	   that invalid sequences in the original commit may be copied to the
	   output. Likewise, if iconv(3) fails to convert the commit, we will
	   quietly output the original object verbatim.

       --expand-tabs=<n>, --expand-tabs, --no-expand-tabs
	   Perform a tab expansion (replace each tab with enough spaces to
	   fill to the next display column that is multiple of <n>) in the log
	   message before showing it in the output.  --expand-tabs is a
	   short-hand for --expand-tabs=8, and --no-expand-tabs is a
	   short-hand for --expand-tabs=0, which disables tab expansion.

	   By default, tabs are expanded in pretty formats that indent the log
	   message by 4 spaces (i.e.  medium, which is the default, full, and
	   fuller).

       --notes[=<ref>]
	   Show the notes (see git-notes(1)) that annotate the commit, when
	   showing the commit log message. This is the default for git log,
	   git show and git whatchanged commands when there is no --pretty,
	   --format, or --oneline option given on the command line.

	   By default, the notes shown are from the notes refs listed in the
	   core.notesRef and notes.displayRef variables (or corresponding
	   environment overrides). See git-config(1) for more details.

	   With an optional <ref> argument, use the ref to find the notes to
	   display. The ref can specify the full refname when it begins with
	   refs/notes/; when it begins with notes/, refs/ and otherwise
	   refs/notes/ is prefixed to form a full name of the ref.

	   Multiple --notes options can be combined to control which notes are
	   being displayed. Examples: "--notes=foo" will show only notes from
	   "refs/notes/foo"; "--notes=foo --notes" will show both notes from
	   "refs/notes/foo" and from the default notes ref(s).

       --no-notes
	   Do not show notes. This negates the above --notes option, by
	   resetting the list of notes refs from which notes are shown.
	   Options are parsed in the order given on the command line, so e.g.
	   "--notes --notes=foo --no-notes --notes=bar" will only show notes
	   from "refs/notes/bar".

       --show-notes[=<ref>], --[no-]standard-notes
	   These options are deprecated. Use the above --notes/--no-notes
	   options instead.

       --show-signature
	   Check the validity of a signed commit object by passing the
	   signature to gpg --verify and show the output.

       --no-commit-id
	   git diff-tree outputs a line with the commit ID when applicable.
	   This flag suppressed the commit ID output.

       -c
	   This flag changes the way a merge commit is displayed (which means
	   it is useful only when the command is given one <tree-ish>, or
	   --stdin). It shows the differences from each of the parents to the
	   merge result simultaneously instead of showing pairwise diff
	   between a parent and the result one at a time (which is what the -m
	   option does). Furthermore, it lists only files which were modified
	   from all parents.

       --cc
	   This flag changes the way a merge commit patch is displayed, in a
	   similar way to the -c option. It implies the -c and -p options and
	   further compresses the patch output by omitting uninteresting hunks
	   whose the contents in the parents have only two variants and the
	   merge result picks one of them without modification. When all hunks
	   are uninteresting, the commit itself and the commit log message is
	   not shown, just like in any other "empty diff" case.

       --combined-all-paths
	   This flag causes combined diffs (used for merge commits) to list
	   the name of the file from all parents. It thus only has effect when
	   -c or --cc are specified, and is likely only useful if filename
	   changes are detected (i.e. when either rename or copy detection
	   have been requested).

       --always
	   Show the commit itself and the commit log message even if the diff
	   itself is empty.

PRETTY FORMATS
       If the commit is a merge, and if the pretty-format is not oneline,
       email or raw, an additional line is inserted before the Author: line.
       This line begins with "Merge: " and the hashes of ancestral commits are
       printed, separated by spaces. Note that the listed commits may not
       necessarily be the list of the direct parent commits if you have
       limited your view of history: for example, if you are only interested
       in changes related to a certain directory or file.

       There are several built-in formats, and you can define additional
       formats by setting a pretty.<name> config option to either another
       format name, or a format: string, as described below (see git-
       config(1)). Here are the details of the built-in formats:

       o   oneline

	       <hash> <title-line>

	   This is designed to be as compact as possible.

       o   short

	       commit <hash>
	       Author: <author>

	       <title-line>

       o   medium

	       commit <hash>
	       Author: <author>
	       Date:   <author-date>

	       <title-line>

	       <full-commit-message>

       o   full

	       commit <hash>
	       Author: <author>
	       Commit: <committer>

	       <title-line>

	       <full-commit-message>

       o   fuller

	       commit <hash>
	       Author:	   <author>
	       AuthorDate: <author-date>
	       Commit:	   <committer>
	       CommitDate: <committer-date>

	       <title-line>

	       <full-commit-message>

       o   reference

	       <abbrev-hash> (<title-line>, <short-author-date>)

	   This format is used to refer to another commit in a commit message
	   and is the same as --pretty='format:%C(auto)%h (%s, %ad)'. By
	   default, the date is formatted with --date=short unless another
	   --date option is explicitly specified. As with any format: with
	   format placeholders, its output is not affected by other options
	   like --decorate and --walk-reflogs.

       o   email

	       From <hash> <date>
	       From: <author>
	       Date: <author-date>
	       Subject: [PATCH] <title-line>

	       <full-commit-message>

       o   mboxrd

	   Like email, but lines in the commit message starting with "From "
	   (preceded by zero or more ">") are quoted with ">" so they aren't
	   confused as starting a new commit.

       o   raw

	   The raw format shows the entire commit exactly as stored in the
	   commit object. Notably, the hashes are displayed in full,
	   regardless of whether --abbrev or --no-abbrev are used, and parents
	   information show the true parent commits, without taking grafts or
	   history simplification into account. Note that this format affects
	   the way commits are displayed, but not the way the diff is shown
	   e.g. with git log --raw. To get full object names in a raw diff
	   format, use --no-abbrev.

       o   format:<format-string>

	   The format:<format-string> format allows you to specify which
	   information you want to show. It works a little bit like printf
	   format, with the notable exception that you get a newline with %n
	   instead of \n.

	   E.g, format:"The author of %h was %an, %ar%nThe title was >>%s<<%n"
	   would show something like this:

	       The author of fe6e0ee was Junio C Hamano, 23 hours ago
	       The title was >>t4119: test autocomputing -p<n> for traditional diff input.<<

	   The placeholders are:

	   o   Placeholders that expand to a single literal character:

	       %n
		   newline

	       %%
		   a raw %

	       %x00
		   print a byte from a hex code

	   o   Placeholders that affect formatting of later placeholders:

	       %Cred
		   switch color to red

	       %Cgreen
		   switch color to green

	       %Cblue
		   switch color to blue

	       %Creset
		   reset color

	       %C(...)
		   color specification, as described under Values in the
		   "CONFIGURATION FILE" section of git-config(1). By default,
		   colors are shown only when enabled for log output (by
		   color.diff, color.ui, or --color, and respecting the auto
		   settings of the former if we are going to a terminal).
		   %C(auto,...)	 is accepted as a historical synonym for the
		   default (e.g., %C(auto,red)). Specifying %C(always,...)
		   will show the colors even when color is not otherwise
		   enabled (though consider just using --color=always to
		   enable color for the whole output, including this format
		   and anything else git might color).	auto alone (i.e.
		   %C(auto)) will turn on auto coloring on the next
		   placeholders until the color is switched again.

	       %m
		   left (<), right (>) or boundary (-) mark

	       %w([<w>[,<i1>[,<i2>]]])
		   switch line wrapping, like the -w option of git-
		   shortlog(1).

	       %<(<N>[,trunc|ltrunc|mtrunc])
		   make the next placeholder take at least N columns, padding
		   spaces on the right if necessary. Optionally truncate at
		   the beginning (ltrunc), the middle (mtrunc) or the end
		   (trunc) if the output is longer than N columns. Note that
		   truncating only works correctly with N >= 2.

	       %<|(<N>)
		   make the next placeholder take at least until Nth columns,
		   padding spaces on the right if necessary

	       %>(<N>), %>|(<N>)
		   similar to %<(<N>), %<|(<N>) respectively, but padding
		   spaces on the left

	       %>>(<N>), %>>|(<N>)
		   similar to %>(<N>), %>|(<N>) respectively, except that if
		   the next placeholder takes more spaces than given and there
		   are spaces on its left, use those spaces

	       %><(<N>), %><|(<N>)
		   similar to %<(<N>), %<|(<N>) respectively, but padding both
		   sides (i.e. the text is centered)

	   o   Placeholders that expand to information extracted from the
	       commit:

	       %H
		   commit hash

	       %h
		   abbreviated commit hash

	       %T
		   tree hash

	       %t
		   abbreviated tree hash

	       %P
		   parent hashes

	       %p
		   abbreviated parent hashes

	       %an
		   author name

	       %aN
		   author name (respecting .mailmap, see git-shortlog(1) or
		   git-blame(1))

	       %ae
		   author email

	       %aE
		   author email (respecting .mailmap, see git-shortlog(1) or
		   git-blame(1))

	       %al
		   author email local-part (the part before the @ sign)

	       %aL
		   author local-part (see %al) respecting .mailmap, see git-
		   shortlog(1) or git-blame(1))

	       %ad
		   author date (format respects --date= option)

	       %aD
		   author date, RFC2822 style

	       %ar
		   author date, relative

	       %at
		   author date, UNIX timestamp

	       %ai
		   author date, ISO 8601-like format

	       %aI
		   author date, strict ISO 8601 format

	       %as
		   author date, short format (YYYY-MM-DD)

	       %ah
		   author date, human style (like the --date=human option of
		   git-rev-list(1))

	       %cn
		   committer name

	       %cN
		   committer name (respecting .mailmap, see git-shortlog(1) or
		   git-blame(1))

	       %ce
		   committer email

	       %cE
		   committer email (respecting .mailmap, see git-shortlog(1)
		   or git-blame(1))

	       %cl
		   committer email local-part (the part before the @ sign)

	       %cL
		   committer local-part (see %cl) respecting .mailmap, see
		   git-shortlog(1) or git-blame(1))

	       %cd
		   committer date (format respects --date= option)

	       %cD
		   committer date, RFC2822 style

	       %cr
		   committer date, relative

	       %ct
		   committer date, UNIX timestamp

	       %ci
		   committer date, ISO 8601-like format

	       %cI
		   committer date, strict ISO 8601 format

	       %cs
		   committer date, short format (YYYY-MM-DD)

	       %ch
		   committer date, human style (like the --date=human option
		   of git-rev-list(1))

	       %d
		   ref names, like the --decorate option of git-log(1)

	       %D
		   ref names without the " (", ")" wrapping.

	       %(describe[:options])
		   human-readable name, like git-describe(1); empty string for
		   undescribable commits. The describe string may be followed
		   by a colon and zero or more comma-separated options.
		   Descriptions can be inconsistent when tags are added or
		   removed at the same time.

		   o   tags[=<bool-value>]: Instead of only considering
		       annotated tags, consider lightweight tags as well.

		   o   abbrev=<number>: Instead of using the default number of
		       hexadecimal digits (which will vary according to the
		       number of objects in the repository with a default of
		       7) of the abbreviated object name, use <number> digits,
		       or as many digits as needed to form a unique object
		       name.

		   o   match=<pattern>: Only consider tags matching the given
		       glob(7) pattern, excluding the "refs/tags/" prefix.

		   o   exclude=<pattern>: Do not consider tags matching the
		       given glob(7) pattern, excluding the "refs/tags/"
		       prefix.

	       %S
		   ref name given on the command line by which the commit was
		   reached (like git log --source), only works with git log

	       %e
		   encoding

	       %s
		   subject

	       %f
		   sanitized subject line, suitable for a filename

	       %b
		   body

	       %B
		   raw body (unwrapped subject and body)

	       %N
		   commit notes

	       %GG
		   raw verification message from GPG for a signed commit

	       %G?
		   show "G" for a good (valid) signature, "B" for a bad
		   signature, "U" for a good signature with unknown validity,
		   "X" for a good signature that has expired, "Y" for a good
		   signature made by an expired key, "R" for a good signature
		   made by a revoked key, "E" if the signature cannot be
		   checked (e.g. missing key) and "N" for no signature

	       %GS
		   show the name of the signer for a signed commit

	       %GK
		   show the key used to sign a signed commit

	       %GF
		   show the fingerprint of the key used to sign a signed
		   commit

	       %GP
		   show the fingerprint of the primary key whose subkey was
		   used to sign a signed commit

	       %GT
		   show the trust level for the key used to sign a signed
		   commit

	       %gD
		   reflog selector, e.g., refs/stash@{1} or refs/stash@{2
		   minutes ago}; the format follows the rules described for
		   the -g option. The portion before the @ is the refname as
		   given on the command line (so git log -g refs/heads/master
		   would yield refs/heads/master@{0}).

	       %gd
		   shortened reflog selector; same as %gD, but the refname
		   portion is shortened for human readability (so
		   refs/heads/master becomes just master).

	       %gn
		   reflog identity name

	       %gN
		   reflog identity name (respecting .mailmap, see git-
		   shortlog(1) or git-blame(1))

	       %ge
		   reflog identity email

	       %gE
		   reflog identity email (respecting .mailmap, see git-
		   shortlog(1) or git-blame(1))

	       %gs
		   reflog subject

	       %(trailers[:options])
		   display the trailers of the body as interpreted by git-
		   interpret-trailers(1). The trailers string may be followed
		   by a colon and zero or more comma-separated options. If any
		   option is provided multiple times the last occurrence wins.

		   o   key=<key>: only show trailers with specified <key>.
		       Matching is done case-insensitively and trailing colon
		       is optional. If option is given multiple times trailer
		       lines matching any of the keys are shown. This option
		       automatically enables the only option so that
		       non-trailer lines in the trailer block are hidden. If
		       that is not desired it can be disabled with only=false.
		       E.g., %(trailers:key=Reviewed-by) shows trailer lines
		       with key Reviewed-by.

		   o   only[=<bool>]: select whether non-trailer lines from
		       the trailer block should be included.

		   o   separator=<sep>: specify a separator inserted between
		       trailer lines. When this option is not given each
		       trailer line is terminated with a line feed character.
		       The string <sep> may contain the literal formatting
		       codes described above. To use comma as separator one
		       must use %x2C as it would otherwise be parsed as next
		       option. E.g., %(trailers:key=Ticket,separator=%x2C )
		       shows all trailer lines whose key is "Ticket" separated
		       by a comma and a space.

		   o   unfold[=<bool>]: make it behave as if
		       interpret-trailer's --unfold option was given. E.g.,
		       %(trailers:only,unfold=true) unfolds and shows all
		       trailer lines.

		   o   keyonly[=<bool>]: only show the key part of the
		       trailer.

		   o   valueonly[=<bool>]: only show the value part of the
		       trailer.

		   o   key_value_separator=<sep>: specify a separator inserted
		       between trailer lines. When this option is not given
		       each trailer key-value pair is separated by ": ".
		       Otherwise it shares the same semantics as
		       separator=<sep> above.

	   Note
	   Some placeholders may depend on other options given to the revision
	   traversal engine. For example, the %g* reflog options will insert
	   an empty string unless we are traversing reflog entries (e.g., by
	   git log -g). The %d and %D placeholders will use the "short"
	   decoration format if --decorate was not already provided on the
	   command line.

       The boolean options accept an optional value [=<bool-value>]. The
       values true, false, on, off etc. are all accepted. See the "boolean"
       sub-section in "EXAMPLES" in git-config(1). If a boolean option is
       given with no value, it's enabled.

       If you add a + (plus sign) after % of a placeholder, a line-feed is
       inserted immediately before the expansion if and only if the
       placeholder expands to a non-empty string.

       If you add a - (minus sign) after % of a placeholder, all consecutive
       line-feeds immediately preceding the expansion are deleted if and only
       if the placeholder expands to an empty string.

       If you add a ` ` (space) after % of a placeholder, a space is inserted
       immediately before the expansion if and only if the placeholder expands
       to a non-empty string.

       o   tformat:

	   The tformat: format works exactly like format:, except that it
	   provides "terminator" semantics instead of "separator" semantics.
	   In other words, each commit has the message terminator character
	   (usually a newline) appended, rather than a separator placed
	   between entries. This means that the final entry of a single-line
	   format will be properly terminated with a new line, just as the
	   "oneline" format does. For example:

	       $ git log -2 --pretty=format:%h 4da45bef \
		 | perl -pe '$_ .= " -- NO NEWLINE\n" unless /\n/'
	       4da45be
	       7134973 -- NO NEWLINE

	       $ git log -2 --pretty=tformat:%h 4da45bef \
		 | perl -pe '$_ .= " -- NO NEWLINE\n" unless /\n/'
	       4da45be
	       7134973

	   In addition, any unrecognized string that has a % in it is
	   interpreted as if it has tformat: in front of it. For example,
	   these two are equivalent:

	       $ git log -2 --pretty=tformat:%h 4da45bef
	       $ git log -2 --pretty=%h 4da45bef


RAW OUTPUT FORMAT
       The raw output format from "git-diff-index", "git-diff-tree",
       "git-diff-files" and "git diff --raw" are very similar.

       These commands all compare two sets of things; what is compared
       differs:

       git-diff-index <tree-ish>
	   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.

       The "git-diff-tree" command begins its output by printing the hash of
       what is being compared. After that, all the commands print one output
       line per changed file.

       An output line is formatted this way:

	   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


       That is, from the left to the right:

	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 deletion, unmerged or "work tree out of
	   sync with the index".

	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.

       Possible status letters are:

       o   A: addition of a file

       o   C: copy of a file into a new one

       o   D: deletion of a file

       o   M: modification of the contents or mode of a file

       o   R: renaming of a file

       o   T: change in the type of the file (regular file, symbolic link or
	   submodule)

       o   U: file is unmerged (you must complete the merge before it can be
	   committed)

       o   X: "unknown" change type (most probably a bug, please report it)

       Status letters C and R are always followed by a score (denoting the
       percentage of similarity between the source and target of the move or
       copy). Status letter M may be followed by a score (denoting the
       percentage of dissimilarity) for file rewrites.

       The sha1 for "dst" is shown as all 0's if a file on the filesystem is
       out of sync with the index.

       Example:

	   :100644 100644 5be4a4a 0000000 M file.c


       Without the -z option, pathnames with "unusual" characters are quoted
       as explained for the configuration variable core.quotePath (see git-
       config(1)). Using -z the filename is output verbatim and the line is
       terminated by a NUL byte.

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. tab-separated pathname(s) of the file

       For -c and --cc, only the destination or final path is shown even if
       the file was renamed on any side of history. With --combined-all-paths,
       the name of the path in each parent is shown followed by the name of
       the path in the merge commit.

       Examples for -c and --cc without --combined-all-paths:

	   ::100644 100644 100644 fabadb8 cc95eb0 4866510 MM	   desc.c
	   ::100755 100755 100755 52b7a2d 6d1ac04 d2ac7d7 RM	   bar.sh
	   ::100644 100644 100644 e07d6c5 9042e82 ee91881 RR	   phooey.c


       Examples when --combined-all-paths added to either -c or --cc:

	   ::100644 100644 100644 fabadb8 cc95eb0 4866510 MM	   desc.c  desc.c  desc.c
	   ::100755 100755 100755 52b7a2d 6d1ac04 d2ac7d7 RM	   foo.sh  bar.sh  bar.sh
	   ::100644 100644 100644 e07d6c5 9042e82 ee91881 RR	   fooey.c fuey.c  phooey.c


       Note that combined diff lists only files which were modified from all
       parents.

GENERATING PATCH TEXT WITH -P
       Running git-diff(1), git-log(1), git-show(1), git-diff-index(1), git-
       diff-tree(1), or git-diff-files(1) with the -p option produces patch
       text. You can customize the creation of patch text via the
       GIT_EXTERNAL_DIFF and the GIT_DIFF_OPTS environment variables (see
       git(1)), and the diff attribute (see gitattributes(5)).

       What the -p option produces is slightly different from the traditional
       diff format:

	1. It is preceded with a "git diff" header that looks like this:

	       diff --git a/file1 b/file2

	   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.

	2. It is followed by one or more extended header lines:

	       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>

	   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 blob object names 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.

	3. Pathnames with "unusual" characters are quoted as explained for the
	   configuration variable core.quotePath (see git-config(1)).

	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

	5. Hunk headers mention the name of the function to which the hunk
	   applies. See "Defining a custom hunk-header" in gitattributes(5)
	   for details of how to tailor to this to specific languages.

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 suitable --diff-merges option to any of these commands to force
       generation of diffs in specific format.

       A "combined diff" format looks like this:

	   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
	   the -c option is used):

	       diff --combined file

	   or like this (when the --cc option is used):

	       diff --cc file

	2. It is followed by one or more extended header lines (this example
	   shows a merge with two parents):

	       index <hash>,<hash>..<hash>
	       mode <mode>,<mode>..<mode>
	       new file mode <mode>
	       deleted file mode <mode>,<mode>

	   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.

	3. It is followed by two-line from-file/to-file header

	       --- a/file
	       +++ b/file

	   Similar to two-line header for traditional unified diff format,
	   /dev/null is used to signal created or deleted files.

	   However, if the --combined-all-paths option is provided, instead of
	   a two-line from-file/to-file you get a N+1 line from-file/to-file
	   header, where N is the number of parents in the merge commit

	       --- a/file
	       --- a/file
	       --- a/file
	       +++ b/file

	   This extended format can be useful if rename or copy detection is
	   active, to allow you to see the original name of the file in
	   different parents.

	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 to be applied.
	   The change is similar to the change in the extended index header:

	       @@@ <from-file-range> <from-file-range> <to-file-range> @@@

	   There are (number of parents + 1) @ characters in the chunk header
	   for combined diff format.

       Unlike the traditional unified diff format, which shows two files A and
       B with a single column that has - (minus -- appears in A but removed in
       B), + (plus -- missing in A but added to B), or " " (space --
       unchanged) prefix, this format compares two or more files file1,
       file2,... with one file X, and shows how X differs from each of fileN.
       One column for each of fileN is prepended to the output line to note
       how X's line is different from it.

       A - character in the column N means that the line appears in fileN but
       it does not appear in the result. A + character in the column N means
       that the line appears in the result, and fileN does not have that line
       (in other words, the line was added, from the point of view of that
       parent).

       In the above example output, the function signature was changed from
       both files (hence two - removals from both file1 and file2, plus ++ to
       mean one line that was added does not appear in either file1 or file2).
       Also eight other lines are the same from file1 but do not appear in
       file2 (hence prefixed with +).

       When shown by git diff-tree -c, it compares the parents of a merge
       commit with the merge result (i.e. file1..fileN are the parents). When
       shown by git diff-files -c, it compares the two unresolved merge
       parents with the working tree file (i.e. file1 is stage 2 aka "our
       version", file2 is stage 3 aka "their version").

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.

       When showing a change that involves a rename or a copy, --stat output
       formats the pathnames compactly by combining common prefix and suffix
       of the pathnames. For example, a change that moves arch/i386/Makefile
       to arch/x86/Makefile while modifying 4 lines will be shown like this:

	   arch/{i386 => x86}/Makefile	  |   4 +--


       The --numstat option gives the diffstat(1) information but is designed
       for easier machine consumption. An entry in --numstat output looks like
       this:

	   1	   2	   README
	   3	   1	   arch/{i386 => x86}/Makefile


       That is, from left to right:

	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.

       When -z output option is in effect, the output is formatted this way:

	   1	   2	   README NUL
	   3	   1	   NUL arch/i386/Makefile NUL arch/x86/Makefile NUL


       That is:

	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.

       The extra NUL before the preimage path in renamed case is to allow
       scripts that read the output to tell if the current record being read
       is a single-path record or a rename/copy record without reading ahead.
       After reading added and deleted lines, reading up to NUL would yield
       the pathname, but if that is NUL, the record will show two paths.

GIT
       Part of the git(1) suite



Git 2.38.4			  02/20/2023		      GIT-DIFF-TREE(1)