git-log man page on SmartOS

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GIT-LOG(1)			  Git Manual			    GIT-LOG(1)

NAME
       git-log - Show commit logs

SYNOPSIS
       git log [<options>] [<revision range>] [[--] <path>...]

DESCRIPTION
       Shows the commit logs.

       The command takes options applicable to the git rev-list command to
       control what is shown and how, and options applicable to the git diff-*
       commands to control how the changes each commit introduces are shown.

OPTIONS
       --follow
	   Continue listing the history of a file beyond renames (works only
	   for a single file).

       --no-decorate, --decorate[=short|full|no]
	   Print out the ref names of any commits that are shown. If short is
	   specified, the ref name prefixes refs/heads/, refs/tags/ and
	   refs/remotes/ will not be printed. If full is specified, the full
	   ref name (including prefix) will be printed. The default option is
	   short.

       --source
	   Print out the ref name given on the command line by which each
	   commit was reached.

       --use-mailmap
	   Use mailmap file to map author and committer names and email
	   addresses to canonical real names and email addresses. See git-
	   shortlog(1).

       --full-diff
	   Without this flag, git log -p <path>...  shows commits that touch
	   the specified paths, and diffs about the same specified paths. With
	   this, the full diff is shown for commits that touch the specified
	   paths; this means that "<path>..." limits only commits, and doesn’t
	   limit diff for those commits.

	   Note that this affects all diff-based output types, e.g. those
	   produced by --stat, etc.

       --log-size
	   Include a line “log size <number>” in the output for each commit,
	   where <number> is the length of that commit’s message in bytes.
	   Intended to speed up tools that read log messages from git log
	   output by allowing them to allocate space in advance.

       -L <start>,<end>:<file>, -L :<regex>:<file>
	   Trace the evolution of the line range given by "<start>,<end>" (or
	   the funcname regex <regex>) within the <file>. You may not give any
	   pathspec limiters. This is currently limited to a walk starting
	   from a single revision, i.e., you may only give zero or one
	   positive revision arguments. You can specify this option more than
	   once.

	   <start> and <end> can take one of these forms:

	   ·   number

	       If <start> or <end> is a number, it specifies an absolute line
	       number (lines count from 1).

	   ·   /regex/

	       This form will use the first line matching the given POSIX
	       regex. If <start> is a regex, it will search from the end of
	       the previous -L range, if any, otherwise from the start of
	       file. If <start> is “^/regex/”, it will search from the start
	       of file. If <end> is a regex, it will search starting at the
	       line given by <start>.

	   ·   +offset or -offset

	       This is only valid for <end> and will specify a number of lines
	       before or after the line given by <start>.

	   If “:<regex>” is given in place of <start> and <end>, it denotes
	   the range from the first funcname line that matches <regex>, up to
	   the next funcname line. “:<regex>” searches from the end of the
	   previous -L range, if any, otherwise from the start of file.
	   “^:<regex>” searches from the start of file.

       <revision range>
	   Show only commits in the specified revision range. When no
	   <revision range> is specified, it defaults to HEAD (i.e. the whole
	   history leading to the current commit).  origin..HEAD specifies all
	   the commits reachable from the current commit (i.e.	HEAD), but not
	   from origin. For a complete list of ways to spell <revision range>,
	   see the Specifying Ranges section of gitrevisions(7).

       [--] <path>...
	   Show only commits that are enough to explain how the files that
	   match the specified paths came to be. See History Simplification
	   below for details and other simplification modes.

	   Paths may need to be prefixed with ‘`-- '’ to separate them from
	   options or the revision range, when confusion arises.

   Commit Limiting
       Besides specifying a range of commits that should be listed using the
       special notations explained in the description, additional commit
       limiting may be applied.

       Using more options generally further limits the output (e.g.
       --since=<date1> limits to commits newer than <date1>, and using it with
       --grep=<pattern> further limits to commits whose log message has a line
       that matches <pattern>), unless otherwise noted.

       Note that these are applied before commit ordering and formatting
       options, such as --reverse.

       -<number>, -n <number>, --max-count=<number>
	   Limit the number of commits to output.

       --skip=<number>
	   Skip number commits before starting to show the commit output.

       --since=<date>, --after=<date>
	   Show commits more recent than a specific date.

       --until=<date>, --before=<date>
	   Show commits older than a specific date.

       --author=<pattern>, --committer=<pattern>
	   Limit the commits output to ones with author/committer header lines
	   that match the specified pattern (regular expression). With more
	   than one --author=<pattern>, commits whose author matches any of
	   the given patterns are chosen (similarly for multiple
	   --committer=<pattern>).

       --grep-reflog=<pattern>
	   Limit the commits output to ones with reflog entries that match the
	   specified pattern (regular expression). With more than one
	   --grep-reflog, commits whose reflog message matches any of the
	   given patterns are chosen. It is an error to use this option unless
	   --walk-reflogs is in use.

       --grep=<pattern>
	   Limit the commits output to ones with log message that matches the
	   specified pattern (regular expression). With more than one
	   --grep=<pattern>, commits whose message matches any of the given
	   patterns are chosen (but see --all-match).

	   When --show-notes is in effect, the message from the notes as if it
	   is part of the log message.

       --all-match
	   Limit the commits output to ones that match all given --grep,
	   instead of ones that match at least one.

       -i, --regexp-ignore-case
	   Match the regular expression limiting patterns without regard to
	   letter case.

       --basic-regexp
	   Consider the limiting patterns to be basic regular expressions;
	   this is the default.

       -E, --extended-regexp
	   Consider the limiting patterns to be extended regular expressions
	   instead of the default basic regular expressions.

       -F, --fixed-strings
	   Consider the limiting patterns to be fixed strings (don’t interpret
	   pattern as a regular expression).

       --perl-regexp
	   Consider the limiting patterns to be Perl-compatible regular
	   expressions. Requires libpcre to be compiled in.

       --remove-empty
	   Stop when a given path disappears from the tree.

       --merges
	   Print only merge commits. This is exactly the same as
	   --min-parents=2.

       --no-merges
	   Do not print commits with more than one parent. This is exactly the
	   same as --max-parents=1.

       --min-parents=<number>, --max-parents=<number>, --no-min-parents,
       --no-max-parents
	   Show only commits which have at least (or at most) that many parent
	   commits. In particular, --max-parents=1 is the same as --no-merges,
	   --min-parents=2 is the same as --merges.  --max-parents=0 gives all
	   root commits and --min-parents=3 all octopus merges.

	   --no-min-parents and --no-max-parents reset these limits (to no
	   limit) again. Equivalent forms are --min-parents=0 (any commit has
	   0 or more parents) and --max-parents=-1 (negative numbers denote no
	   upper limit).

       --first-parent
	   Follow only the first parent commit upon seeing a merge commit.
	   This option can give a better overview when viewing the evolution
	   of a particular topic branch, because merges into a topic branch
	   tend to be only about adjusting to updated upstream from time to
	   time, and this option allows you to ignore the individual commits
	   brought in to your history by such a merge.

       --not
	   Reverses the meaning of the ^ prefix (or lack thereof) for all
	   following revision specifiers, up to the next --not.

       --all
	   Pretend as if all the refs in refs/ are listed on the command line
	   as <commit>.

       --branches[=<pattern>]
	   Pretend as if all the refs in refs/heads are listed on the command
	   line as <commit>. If <pattern> is given, limit branches to ones
	   matching given shell glob. If pattern lacks ?, *, or [, /* at the
	   end is implied.

       --tags[=<pattern>]
	   Pretend as if all the refs in refs/tags are listed on the command
	   line as <commit>. If <pattern> is given, limit tags to ones
	   matching given shell glob. If pattern lacks ?, *, or [, /* at the
	   end is implied.

       --remotes[=<pattern>]
	   Pretend as if all the refs in refs/remotes are listed on the
	   command line as <commit>. If <pattern> is given, limit
	   remote-tracking branches to ones matching given shell glob. If
	   pattern lacks ?, *, or [, /* at the end is implied.

       --glob=<glob-pattern>
	   Pretend as if all the refs matching shell glob <glob-pattern> are
	   listed on the command line as <commit>. Leading refs/, is
	   automatically prepended if missing. If pattern lacks ?, *, or [, /*
	   at the end is implied.

       --exclude=<glob-pattern>
	   Do not include refs matching <glob-pattern> that the next --all,
	   --branches, --tags, --remotes, or --glob would otherwise consider.
	   Repetitions of this option accumulate exclusion patterns up to the
	   next --all, --branches, --tags, --remotes, or --glob option (other
	   options or arguments do not clear accumlated patterns).

	   The patterns given should not begin with refs/heads, refs/tags, or
	   refs/remotes when applied to --branches, --tags, or --remotes,
	   respectively, and they must begin with refs/ when applied to --glob
	   or --all. If a trailing /* is intended, it must be given
	   explicitly.

       --ignore-missing
	   Upon seeing an invalid object name in the input, pretend as if the
	   bad input was not given.

       --bisect
	   Pretend as if the bad bisection ref refs/bisect/bad was listed and
	   as if it was followed by --not and the good bisection refs
	   refs/bisect/good-* on the command line.

       --stdin
	   In addition to the <commit> listed on the command line, read them
	   from the standard input. If a -- separator is seen, stop reading
	   commits and start reading paths to limit the result.

       --cherry-mark
	   Like --cherry-pick (see below) but mark equivalent commits with =
	   rather than omitting them, and inequivalent ones with +.

       --cherry-pick
	   Omit any commit that introduces the same change as another commit
	   on the “other side” when the set of commits are limited with
	   symmetric difference.

	   For example, if you have two branches, A and B, a usual way to list
	   all commits on only one side of them is with --left-right (see the
	   example below in the description of the --left-right option).
	   However, it shows the commits that were cherry-picked from the
	   other branch (for example, “3rd on b” may be cherry-picked from
	   branch A). With this option, such pairs of commits are excluded
	   from the output.

       --left-only, --right-only
	   List only commits on the respective side of a symmetric range, i.e.
	   only those which would be marked < resp.  > by --left-right.

	   For example, --cherry-pick --right-only A...B omits those commits
	   from B which are in A or are patch-equivalent to a commit in A. In
	   other words, this lists the + commits from git cherry A B. More
	   precisely, --cherry-pick --right-only --no-merges gives the exact
	   list.

       --cherry
	   A synonym for --right-only --cherry-mark --no-merges; useful to
	   limit the output to the commits on our side and mark those that
	   have been applied to the other side of a forked history with git
	   log --cherry upstream...mybranch, similar to git cherry upstream
	   mybranch.

       -g, --walk-reflogs
	   Instead of walking the commit ancestry chain, walk reflog entries
	   from the most recent one to older ones. When this option is used
	   you cannot specify commits to exclude (that is, ^commit,
	   commit1..commit2, nor commit1...commit2 notations cannot be used).

	   With --pretty format other than oneline (for obvious reasons), this
	   causes the output to have two extra lines of information taken from
	   the reflog. By default, commit@{Nth} notation is used in the
	   output. When the starting commit is specified as commit@{now},
	   output also uses commit@{timestamp} notation instead. Under
	   --pretty=oneline, the commit message is prefixed with this
	   information on the same line. This option cannot be combined with
	   --reverse. See also git-reflog(1).

       --merge
	   After a failed merge, show refs that touch files having a conflict
	   and don’t exist on all heads to merge.

       --boundary
	   Output excluded boundary commits. Boundary commits are prefixed
	   with -.

   History Simplification
       Sometimes you are only interested in parts of the history, for example
       the commits modifying a particular <path>. But there are two parts of
       History Simplification, one part is selecting the commits and the other
       is how to do it, as there are various strategies to simplify the
       history.

       The following options select the commits to be shown:

       <paths>
	   Commits modifying the given <paths> are selected.

       --simplify-by-decoration
	   Commits that are referred by some branch or tag are selected.

       Note that extra commits can be shown to give a meaningful history.

       The following options affect the way the simplification is performed:

       Default mode
	   Simplifies the history to the simplest history explaining the final
	   state of the tree. Simplest because it prunes some side branches if
	   the end result is the same (i.e. merging branches with the same
	   content)

       --full-history
	   Same as the default mode, but does not prune some history.

       --dense
	   Only the selected commits are shown, plus some to have a meaningful
	   history.

       --sparse
	   All commits in the simplified history are shown.

       --simplify-merges
	   Additional option to --full-history to remove some needless merges
	   from the resulting history, as there are no selected commits
	   contributing to this merge.

       --ancestry-path
	   When given a range of commits to display (e.g.  commit1..commit2 or
	   commit2 ^commit1), only display commits that exist directly on the
	   ancestry chain between the commit1 and commit2, i.e. commits that
	   are both descendants of commit1, and ancestors of commit2.

       A more detailed explanation follows.

       Suppose you specified foo as the <paths>. We shall call commits that
       modify foo !TREESAME, and the rest TREESAME. (In a diff filtered for
       foo, they look different and equal, respectively.)

       In the following, we will always refer to the same example history to
       illustrate the differences between simplification settings. We assume
       that you are filtering for a file foo in this commit graph:

		     .-A---M---N---O---P---Q
		    /	  /   /	  /   /	  /
		   I	 B   C	 D   E	 Y
		    \	/   /	/   /	/
		     `-------------'   X

       The horizontal line of history A---Q is taken to be the first parent of
       each merge. The commits are:

       ·    I is the initial commit, in which foo exists with contents “asdf”,
	   and a file quux exists with contents “quux”. Initial commits are
	   compared to an empty tree, so I is !TREESAME.

       ·   In A, foo contains just “foo”.

       ·    B contains the same change as A. Its merge M is trivial and hence
	   TREESAME to all parents.

       ·    C does not change foo, but its merge N changes it to “foobar”, so
	   it is not TREESAME to any parent.

       ·    D sets foo to “baz”. Its merge O combines the strings from N and D
	   to “foobarbaz”; i.e., it is not TREESAME to any parent.

       ·    E changes quux to “xyzzy”, and its merge P combines the strings to
	   “quux xyzzy”.  P is TREESAME to O, but not to E.

       ·    X is an independent root commit that added a new file side, and Y
	   modified it.	 Y is TREESAME to X. Its merge Q added side to P, and
	   Q is TREESAME to P, but not to Y.

       rev-list walks backwards through history, including or excluding
       commits based on whether --full-history and/or parent rewriting (via
       --parents or --children) are used. The following settings are
       available.

       Default mode
	   Commits are included if they are not TREESAME to any parent (though
	   this can be changed, see --sparse below). If the commit was a
	   merge, and it was TREESAME to one parent, follow only that parent.
	   (Even if there are several TREESAME parents, follow only one of
	   them.) Otherwise, follow all parents.

	   This results in:

			 .-A---N---O
			/     /	  /
		       I---------D

	   Note how the rule to only follow the TREESAME parent, if one is
	   available, removed B from consideration entirely.  C was considered
	   via N, but is TREESAME. Root commits are compared to an empty tree,
	   so I is !TREESAME.

	   Parent/child relations are only visible with --parents, but that
	   does not affect the commits selected in default mode, so we have
	   shown the parent lines.

       --full-history without parent rewriting
	   This mode differs from the default in one point: always follow all
	   parents of a merge, even if it is TREESAME to one of them. Even if
	   more than one side of the merge has commits that are included, this
	   does not imply that the merge itself is! In the example, we get

		       I  A  B	N  D  O	 P  Q

	   M was excluded because it is TREESAME to both parents.  E, C and B
	   were all walked, but only B was !TREESAME, so the others do not
	   appear.

	   Note that without parent rewriting, it is not really possible to
	   talk about the parent/child relationships between the commits, so
	   we show them disconnected.

       --full-history with parent rewriting
	   Ordinary commits are only included if they are !TREESAME (though
	   this can be changed, see --sparse below).

	   Merges are always included. However, their parent list is
	   rewritten: Along each parent, prune away commits that are not
	   included themselves. This results in

			 .-A---M---N---O---P---Q
			/     /	  /   /	  /
		       I     B	 /   D	 /
			\   /	/   /	/
			 `-------------'

	   Compare to --full-history without rewriting above. Note that E was
	   pruned away because it is TREESAME, but the parent list of P was
	   rewritten to contain E's parent I. The same happened for C and N,
	   and X, Y and Q.

       In addition to the above settings, you can change whether TREESAME
       affects inclusion:

       --dense
	   Commits that are walked are included if they are not TREESAME to
	   any parent.

       --sparse
	   All commits that are walked are included.

	   Note that without --full-history, this still simplifies merges: if
	   one of the parents is TREESAME, we follow only that one, so the
	   other sides of the merge are never walked.

       --simplify-merges
	   First, build a history graph in the same way that --full-history
	   with parent rewriting does (see above).

	   Then simplify each commit C to its replacement C' in the final
	   history according to the following rules:

	   ·   Set C' to C.

	   ·   Replace each parent P of C' with its simplification P'. In the
	       process, drop parents that are ancestors of other parents or
	       that are root commits TREESAME to an empty tree, and remove
	       duplicates, but take care to never drop all parents that we are
	       TREESAME to.

	   ·   If after this parent rewriting, C' is a root or merge commit
	       (has zero or >1 parents), a boundary commit, or !TREESAME, it
	       remains. Otherwise, it is replaced with its only parent.

	   The effect of this is best shown by way of comparing to
	   --full-history with parent rewriting. The example turns into:

			 .-A---M---N---O
			/     /	      /
		       I     B	     D
			\   /	    /
			 `---------'

	   Note the major differences in N, P, and Q over --full-history:

	   ·	N's parent list had I removed, because it is an ancestor of
	       the other parent M. Still, N remained because it is !TREESAME.

	   ·	P's parent list similarly had I removed.  P was then removed
	       completely, because it had one parent and is TREESAME.

	   ·	Q's parent list had Y simplified to X.	X was then removed,
	       because it was a TREESAME root.	Q was then removed completely,
	       because it had one parent and is TREESAME.

       Finally, there is a fifth simplification mode available:

       --ancestry-path
	   Limit the displayed commits to those directly on the ancestry chain
	   between the “from” and “to” commits in the given commit range. I.e.
	   only display commits that are ancestor of the “to” commit and
	   descendants of the “from” commit.

	   As an example use case, consider the following commit history:

			   D---E-------F
			  /	\	\
			 B---C---G---H---I---J
			/		      \
		       A-------K---------------L--M

	   A regular D..M computes the set of commits that are ancestors of M,
	   but excludes the ones that are ancestors of D. This is useful to
	   see what happened to the history leading to M since D, in the sense
	   that “what does M have that did not exist in D”. The result in this
	   example would be all the commits, except A and B (and D itself, of
	   course).

	   When we want to find out what commits in M are contaminated with
	   the bug introduced by D and need fixing, however, we might want to
	   view only the subset of D..M that are actually descendants of D,
	   i.e. excluding C and K. This is exactly what the --ancestry-path
	   option does. Applied to the D..M range, it results in:

			       E-------F
				\	\
				 G---H---I---J
					      \
					       L--M

       The --simplify-by-decoration option allows you to view only the big
       picture of the topology of the history, by omitting commits that are
       not referenced by tags. Commits are marked as !TREESAME (in other
       words, kept after history simplification rules described above) if (1)
       they are referenced by tags, or (2) they change the contents of the
       paths given on the command line. All other commits are marked as
       TREESAME (subject to be simplified away).

   Commit Ordering
       By default, the commits are shown in reverse chronological order.

       --date-order
	   Show no parents before all of its children are shown, but otherwise
	   show commits in the commit timestamp order.

       --author-date-order
	   Show no parents before all of its children are shown, but otherwise
	   show commits in the author timestamp order.

       --topo-order
	   Show no parents before all of its children are shown, and avoid
	   showing commits on multiple lines of history intermixed.

	   For example, in a commit history like this:

		   ---1----2----4----7
		       \	      \
			3----5----6----8---

	   where the numbers denote the order of commit timestamps, git
	   rev-list and friends with --date-order show the commits in the
	   timestamp order: 8 7 6 5 4 3 2 1.

	   With --topo-order, they would show 8 6 5 3 7 4 2 1 (or 8 7 4 2 6 5
	   3 1); some older commits are shown before newer ones in order to
	   avoid showing the commits from two parallel development track mixed
	   together.

       --reverse
	   Output the commits in reverse order. Cannot be combined with
	   --walk-reflogs.

   Object Traversal
       These options are mostly targeted for packing of Git repositories.

       --objects
	   Print the object IDs of any object referenced by the listed
	   commits.  --objects foo ^bar thus means “send me all object IDs
	   which I need to download if I have the commit object bar but not
	   foo”.

       --objects-edge
	   Similar to --objects, but also print the IDs of excluded commits
	   prefixed with a “-” character. This is used by git-pack-objects(1)
	   to build “thin” pack, which records objects in deltified form based
	   on objects contained in these excluded commits to reduce network
	   traffic.

       --unpacked
	   Only useful with --objects; print the object IDs that are not in
	   packs.

       --no-walk[=(sorted|unsorted)]
	   Only show the given commits, but do not traverse their ancestors.
	   This has no effect if a range is specified. If the argument
	   unsorted is given, the commits are shown in the order they were
	   given on the command line. Otherwise (if sorted or no argument was
	   given), the commits are shown in reverse chronological order by
	   commit time.

       --do-walk
	   Overrides a previous --no-walk.

   Commit Formatting
       --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,
	   email, raw and format:<string>. See the "PRETTY FORMATS" section
	   for some additional details for each format. When omitted, the
	   format 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 only a partial prefix. Non default number of digits can be
	   specified with "--abbrev=<n>" (which also modifies diff output, if
	   it is displayed).

	   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 and those options which imply it such as
	   "--oneline". It also overrides the log.abbrevCommit variable.

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

       --encoding=<encoding>
	   The commit objects record the 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.

       --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 nor --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, show this notes ref instead of the
	   default notes ref(s). The ref is taken to be in refs/notes/ if it
	   is not qualified.

	   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.

       --relative-date
	   Synonym for --date=relative.

       --date=(relative|local|default|iso|rfc|short|raw)
	   Only takes effect for dates shown in human-readable format, such as
	   when using --pretty.	 log.date config variable sets a default value
	   for the log command’s --date option.

	   --date=relative shows dates relative to the current time, e.g. “2
	   hours ago”.

	   --date=local shows timestamps in user’s local time zone.

	   --date=iso (or --date=iso8601) shows timestamps in ISO 8601 format.

	   --date=rfc (or --date=rfc2822) shows timestamps in RFC 2822 format,
	   often found in email messages.

	   --date=short shows only the date, but not the time, in YYYY-MM-DD
	   format.

	   --date=raw shows the date in the internal raw Git format %s %z
	   format.

	   --date=default shows timestamps in the original time zone (either
	   committer’s or author’s).

       --parents
	   Print also the parents of the commit (in the form "commit
	   parent..."). Also enables parent rewriting, see History
	   Simplification below.

       --children
	   Print also the children of the commit (in the form "commit
	   child..."). Also enables parent rewriting, see History
	   Simplification below.

       --left-right
	   Mark which side of a symmetric diff a commit is reachable from.
	   Commits from the left side are prefixed with < and those from the
	   right with >. If combined with --boundary, those commits are
	   prefixed with -.

	   For example, if you have this topology:

			    y---b---b  branch B
			   / \ /
			  /   .
			 /   / \
			o---x---a---a  branch A

	   you would get an output like this:

		       $ git rev-list --left-right --boundary --pretty=oneline A...B

		       >bbbbbbb... 3rd on b
		       >bbbbbbb... 2nd on b
		       <aaaaaaa... 3rd on a
		       <aaaaaaa... 2nd on a
		       -yyyyyyy... 1st on b
		       -xxxxxxx... 1st on a

       --graph
	   Draw a text-based graphical representation of the commit history on
	   the left hand side of the output. This may cause extra lines to be
	   printed in between commits, in order for the graph history to be
	   drawn properly.

	   This enables parent rewriting, see History Simplification below.

	   This implies the --topo-order option by default, but the
	   --date-order option may also be specified.

   Diff Formatting
       Listed below are options that control the formatting of diff output.
       Some of them are specific to git-rev-list(1), however other diff
       options may be given. See git-diff-files(1) for more options.

       -c
	   With this option, diff output for a merge commit 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. Furthermore, it lists only files
	   which were modified from all parents.

       --cc
	   This flag implies the -c option and further compresses the patch
	   output by omitting uninteresting hunks whose contents in the
	   parents have only two variants and the merge result picks one of
	   them without modification.

       -m
	   This flag makes the merge commits show the full diff like regular
	   commits; for each merge parent, a separate log entry and diff is
	   generated. An exception is that only diff against the first parent
	   is shown when --first-parent option is given; in that case, the
	   output represents the changes the merge brought into the
	   then-current branch.

       -r
	   Show recursive diffs.

       -t
	   Show the tree objects in the diff output. This implies -r.

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 sha1s 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:

       ·    oneline

	       <sha1> <title line>

	   This is designed to be as compact as possible.

       ·    short

	       commit <sha1>
	       Author: <author>

	       <title line>

       ·    medium

	       commit <sha1>
	       Author: <author>
	       Date:   <author date>

	       <title line>

	       <full commit message>

       ·    full

	       commit <sha1>
	       Author: <author>
	       Commit: <committer>

	       <title line>

	       <full commit message>

       ·    fuller

	       commit <sha1>
	       Author:	   <author>
	       AuthorDate: <author date>
	       Commit:	   <committer>
	       CommitDate: <committer date>

	       <title line>

	       <full commit message>

       ·    email

	       From <sha1> <date>
	       From: <author>
	       Date: <author date>
	       Subject: [PATCH] <title line>

	       <full commit message>

       ·    raw

	   The raw format shows the entire commit exactly as stored in the
	   commit object. Notably, the SHA-1s are displayed in full,
	   regardless of whether --abbrev or --no-abbrev are used, and parents
	   information show the true parent commits, without taking grafts nor
	   history simplification into account.

       ·    format:<string>

	   The 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:

	   ·	%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))

	   ·	%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 format

	   ·	%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))

	   ·	%cd: committer date

	   ·	%cD: committer date, RFC2822 style

	   ·	%cr: committer date, relative

	   ·	%ct: committer date, UNIX timestamp

	   ·	%ci: committer date, ISO 8601 format

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

	   ·	%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 signature, "B" for a Bad signature,
	       "U" for a good, untrusted signature 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

	   ·	%gD: reflog selector, e.g., refs/stash@{1}

	   ·	%gd: shortened reflog selector, e.g., stash@{1}

	   ·	%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

	   ·	%Cred: switch color to red

	   ·	%Cgreen: switch color to green

	   ·	%Cblue: switch color to blue

	   ·	%Creset: reset color

	   ·	%C(...): color specification, as described in color.branch.*
	       config option; adding auto, at the beginning will emit color
	       only when colors are 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).  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

	   ·	%n: newline

	   ·	%%: a raw %

	   ·	%x00: print a byte from a hex code

	   ·	%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)

	   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 placeholder will use the "short" decoration
	   format if --decorate was not already provided on the command line.

       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, line-feeds that
       immediately precede 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.

       ·    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

COMMON DIFF 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 -p.

       --raw
	   Generate the raw format.

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

       --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.

       --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 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>.

       --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.

       --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.

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

       --patch-with-stat
	   Synonym for -p --stat.

       -z
	   Separate the commits with NULs instead of with new newlines.

	   Also, when --raw or --numstat has been given, do not munge
	   pathnames and use NULs as output field terminators.

	   Without this option, each pathname output will have TAB, LF, double
	   quotes, and backslash characters replaced with \t, \n, \", and \\,
	   respectively, and the pathname will be enclosed in double quotes if
	   any of those replacements occurred.

       --name-only
	   Show only names of changed files.

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

       --submodule[=<format>]
	   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.

       --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.

       --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.

	   The regex can also be set via a diff driver or configuration
	   option, see gitattributes(1) 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.

       --check
	   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.

       --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.

       --abbrev[=<n>]
	   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>.

       -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>]
	   If generating diffs, detect and report renames for each commit. For
	   following files across renames while traversing history, see
	   --follow. 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 nor 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.

	   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 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.

       --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.

       -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.

       -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 !regexec(regexp, two->ptr, 1, ®match, 0);
	       ...
	       -    hit = !regexec(regexp, mf2.ptr, 1, ®match, 0);

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

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

       --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>
	   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.

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

       --relative[=<path>]
	   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.

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

       --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.

       --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.

       -W, --function-context
	   Show whole surrounding functions of changes.

       --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.

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

GENERATING PATCHES WITH -P
       When "git-diff-index", "git-diff-tree", or "git-diff-files" are run
       with a -p option, "git diff" without the --raw option, or "git log"
       with the "-p" option, they do not produce the output described above;
       instead they produce a patch file. You can customize the creation of
       such patches via the GIT_EXTERNAL_DIFF and the GIT_DIFF_OPTS
       environment variables.

       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 SHA-1 checksum 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. TAB, LF, double quote and backslash characters in pathnames are
	   represented as \t, \n, \" and \\, respectively. If there is need
	   for such substitution then the whole pathname is put in double
	   quotes.

	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

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 the `-m’ option to any of these commands to force generation of
       diffs with individual parents of a merge.

       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
	   -c option is used):

	       diff --combined file

	   or like this (when --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.

	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 for apply. 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 nor
       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").

EXAMPLES
       git log --no-merges
	   Show the whole commit history, but skip any merges

       git log v2.6.12.. include/scsi drivers/scsi
	   Show all commits since version v2.6.12 that changed any file in the
	   include/scsi or drivers/scsi subdirectories

       git log --since="2 weeks ago" -- gitk
	   Show the changes during the last two weeks to the file gitk. The
	   “--” is necessary to avoid confusion with the branch named gitk

       git log --name-status release..test
	   Show the commits that are in the "test" branch but not yet in the
	   "release" branch, along with the list of paths each commit
	   modifies.

       git log --follow builtin/rev-list.c
	   Shows the commits that changed builtin/rev-list.c, including those
	   commits that occurred before the file was given its present name.

       git log --branches --not --remotes=origin
	   Shows all commits that are in any of local branches but not in any
	   of remote-tracking branches for origin (what you have that origin
	   doesn’t).

       git log master --not --remotes=*/master
	   Shows all commits that are in local master but not in any remote
	   repository master branches.

       git log -p -m --first-parent
	   Shows the history including change diffs, but only from the “main
	   branch” perspective, skipping commits that come from merged
	   branches, and showing full diffs of changes introduced by the
	   merges. This makes sense only when following a strict policy of
	   merging all topic branches when staying on a single integration
	   branch.

       git log -L '/int main/',/^}/:main.c
	   Shows how the function main() in the file main.c evolved over time.

       git log -3
	   Limits the number of commits to show to 3.

DISCUSSION
       At the core level, Git is character encoding agnostic.

       ·   The pathnames recorded in the index and in the tree objects are
	   treated as uninterpreted sequences of non-NUL bytes. What
	   readdir(2) returns are what are recorded and compared with the data
	   Git keeps track of, which in turn are expected to be what lstat(2)
	   and creat(2) accepts. There is no such thing as pathname encoding
	   translation.

       ·   The contents of the blob objects are uninterpreted sequences of
	   bytes. There is no encoding translation at the core level.

       ·   The commit log messages are uninterpreted sequences of non-NUL
	   bytes.

       Although we encourage that the commit log messages are encoded in
       UTF-8, both the core and Git Porcelain are designed not to force UTF-8
       on projects. If all participants of a particular project find it more
       convenient to use legacy encodings, Git does not forbid it. However,
       there are a few things to keep in mind.

	1.  git commit and git commit-tree issues a warning if the commit log
	   message given to it does not look like a valid UTF-8 string, unless
	   you explicitly say your project uses a legacy encoding. The way to
	   say this is to have i18n.commitencoding in .git/config file, like
	   this:

	       [i18n]
		       commitencoding = ISO-8859-1

	   Commit objects created with the above setting record the value of
	   i18n.commitencoding in its encoding header. This is to help other
	   people who look at them later. Lack of this header implies that the
	   commit log message is encoded in UTF-8.

	2.  git log, git show, git blame and friends look at the encoding
	   header of a commit object, and try to re-code the log message into
	   UTF-8 unless otherwise specified. You can specify the desired
	   output encoding with i18n.logoutputencoding in .git/config file,
	   like this:

	       [i18n]
		       logoutputencoding = ISO-8859-1

	   If you do not have this configuration variable, the value of
	   i18n.commitencoding is used instead.

       Note that we deliberately chose not to re-code the commit log message
       when a commit is made to force UTF-8 at the commit object level,
       because re-coding to UTF-8 is not necessarily a reversible operation.

CONFIGURATION
       See git-config(1) for core variables and git-diff(1) for settings
       related to diff generation.

       format.pretty
	   Default for the --format option. (See Pretty Formats above.)
	   Defaults to medium.

       i18n.logOutputEncoding
	   Encoding to use when displaying logs. (See Discussion above.)
	   Defaults to the value of i18n.commitEncoding if set, and UTF-8
	   otherwise.

       log.date
	   Default format for human-readable dates. (Compare the --date
	   option.) Defaults to "default", which means to write dates like Sat
	   May 8 19:35:34 2010 -0500.

       log.showroot
	   If false, git log and related commands will not treat the initial
	   commit as a big creation event. Any root commits in git log -p
	   output would be shown without a diff attached. The default is true.

       mailmap.*
	   See git-shortlog(1).

       notes.displayRef
	   Which refs, in addition to the default set by core.notesRef or
	   GIT_NOTES_REF, to read notes from when showing commit messages with
	   the log family of commands. See git-notes(1).

	   May be an unabbreviated ref name or a glob and may be specified
	   multiple times. A warning will be issued for refs that do not
	   exist, but a glob that does not match any refs is silently ignored.

	   This setting can be disabled by the --no-notes option, overridden
	   by the GIT_NOTES_DISPLAY_REF environment variable, and overridden
	   by the --notes=<ref> option.

GIT
       Part of the git(1) suite

Git 1.9.0			  04/22/2014			    GIT-LOG(1)
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