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git-merge(1) [xfree86 man page]

GIT-MERGE(1)							    Git Manual							      GIT-MERGE(1)

       git-merge - Join two or more development histories together

       git merge [-n] [--stat] [--no-commit] [--squash] [--[no-]edit]
	       [-s <strategy>] [-X <strategy-option>] [-S[<keyid>]]
	       [--[no-]rerere-autoupdate] [-m <msg>] [<commit>...]
       git merge --abort
       git merge --continue

       Incorporates changes from the named commits (since the time their histories diverged from the current branch) into the current branch. This
       command is used by git pull to incorporate changes from another repository and can be used by hand to merge changes from one branch into

       Assume the following history exists and the current branch is "master":

		     A---B---C topic
	       D---E---F---G master

       Then "git merge topic" will replay the changes made on the topic branch since it diverged from master (i.e., E) until its current commit
       (C) on top of master, and record the result in a new commit along with the names of the two parent commits and a log message from the user
       describing the changes.

		     A---B---C topic
	       D---E---F---G---H master

       The second syntax ("git merge --abort") can only be run after the merge has resulted in conflicts. git merge --abort will abort the merge
       process and try to reconstruct the pre-merge state. However, if there were uncommitted changes when the merge started (and especially if
       those changes were further modified after the merge was started), git merge --abort will in some cases be unable to reconstruct the
       original (pre-merge) changes. Therefore:

       Warning: Running git merge with non-trivial uncommitted changes is discouraged: while possible, it may leave you in a state that is hard to
       back out of in the case of a conflict.

       The fourth syntax ("git merge --continue") can only be run after the merge has resulted in conflicts.

       --commit, --no-commit
	   Perform the merge and commit the result. This option can be used to override --no-commit.

	   With --no-commit perform the merge but pretend the merge failed and do not autocommit, to give the user a chance to inspect and further
	   tweak the merge result before committing.

       --edit, -e, --no-edit
	   Invoke an editor before committing successful mechanical merge to further edit the auto-generated merge message, so that the user can
	   explain and justify the merge. The --no-edit option can be used to accept the auto-generated message (this is generally discouraged).
	   The --edit (or -e) option is still useful if you are giving a draft message with the -m option from the command line and want to edit
	   it in the editor.

	   Older scripts may depend on the historical behaviour of not allowing the user to edit the merge log message. They will see an editor
	   opened when they run git merge. To make it easier to adjust such scripts to the updated behaviour, the environment variable
	   GIT_MERGE_AUTOEDIT can be set to no at the beginning of them.

	   When the merge resolves as a fast-forward, only update the branch pointer, without creating a merge commit. This is the default

	   Create a merge commit even when the merge resolves as a fast-forward. This is the default behaviour when merging an annotated (and
	   possibly signed) tag that is not stored in its natural place in refs/tags/ hierarchy.

	   Refuse to merge and exit with a non-zero status unless the current HEAD is already up to date or the merge can be resolved as a

       -S[<keyid>], --gpg-sign[=<keyid>]
	   GPG-sign the resulting merge commit. The keyid argument is optional and defaults to the committer identity; if specified, it must be
	   stuck to the option without a space.

       --log[=<n>], --no-log
	   In addition to branch names, populate the log message with one-line descriptions from at most <n> actual commits that are being merged.
	   See also git-fmt-merge-msg(1).

	   With --no-log do not list one-line descriptions from the actual commits being merged.

       --signoff, --no-signoff
	   Add Signed-off-by line by the committer at the end of the commit log message. The meaning of a signoff depends on the project, but it
	   typically certifies that committer has the rights to submit this work under the same license and agrees to a Developer Certificate of
	   Origin (see for more information).

	   With --no-signoff do not add a Signed-off-by line.

       --stat, -n, --no-stat
	   Show a diffstat at the end of the merge. The diffstat is also controlled by the configuration option merge.stat.

	   With -n or --no-stat do not show a diffstat at the end of the merge.

       --squash, --no-squash
	   Produce the working tree and index state as if a real merge happened (except for the merge information), but do not actually make a
	   commit, move the HEAD, or record $GIT_DIR/MERGE_HEAD (to cause the next git commit command to create a merge commit). This allows you
	   to create a single commit on top of the current branch whose effect is the same as merging another branch (or more in case of an

	   With --no-squash perform the merge and commit the result. This option can be used to override --squash.

       -s <strategy>, --strategy=<strategy>
	   Use the given merge strategy; can be supplied more than once to specify them in the order they should be tried. If there is no -s
	   option, a built-in list of strategies is used instead (git merge-recursive when merging a single head, git merge-octopus otherwise).

       -X <option>, --strategy-option=<option>
	   Pass merge strategy specific option through to the merge strategy.

       --verify-signatures, --no-verify-signatures
	   Verify that the tip commit of the side branch being merged is signed with a valid key, i.e. a key that has a valid uid: in the default
	   trust model, this means the signing key has been signed by a trusted key. If the tip commit of the side branch is not signed with a
	   valid key, the merge is aborted.

       --summary, --no-summary
	   Synonyms to --stat and --no-stat; these are deprecated and will be removed in the future.

       -q, --quiet
	   Operate quietly. Implies --no-progress.

       -v, --verbose
	   Be verbose.

       --progress, --no-progress
	   Turn progress on/off explicitly. If neither is specified, progress is shown if standard error is connected to a terminal. Note that not
	   all merge strategies may support progress reporting.

	   By default, git merge command refuses to merge histories that do not share a common ancestor. This option can be used to override this
	   safety when merging histories of two projects that started their lives independently. As that is a very rare occasion, no configuration
	   variable to enable this by default exists and will not be added.

       -m <msg>
	   Set the commit message to be used for the merge commit (in case one is created).

	   If --log is specified, a shortlog of the commits being merged will be appended to the specified message.

	   The git fmt-merge-msg command can be used to give a good default for automated git merge invocations. The automated message can include
	   the branch description.

	   Allow the rerere mechanism to update the index with the result of auto-conflict resolution if possible.

	   Abort the current conflict resolution process, and try to reconstruct the pre-merge state.

	   If there were uncommitted worktree changes present when the merge started, git merge --abort will in some cases be unable to
	   reconstruct these changes. It is therefore recommended to always commit or stash your changes before running git merge.

	   git merge --abort is equivalent to git reset --merge when MERGE_HEAD is present.

	   After a git merge stops due to conflicts you can conclude the merge by running git merge --continue (see "HOW TO RESOLVE CONFLICTS"
	   section below).

	   Commits, usually other branch heads, to merge into our branch. Specifying more than one commit will create a merge with more than two
	   parents (affectionately called an Octopus merge).

	   If no commit is given from the command line, merge the remote-tracking branches that the current branch is configured to use as its
	   upstream. See also the configuration section of this manual page.

	   When FETCH_HEAD (and no other commit) is specified, the branches recorded in the .git/FETCH_HEAD file by the previous invocation of git
	   fetch for merging are merged to the current branch.

       Before applying outside changes, you should get your own work in good shape and committed locally, so it will not be clobbered if there are
       conflicts. See also git-stash(1). git pull and git merge will stop without doing anything when local uncommitted changes overlap with files
       that git pull/git merge may need to update.

       To avoid recording unrelated changes in the merge commit, git pull and git merge will also abort if there are any changes registered in the
       index relative to the HEAD commit. (One exception is when the changed index entries are in the state that would result from the merge

       If all named commits are already ancestors of HEAD, git merge will exit early with the message "Already up to date."

       Often the current branch head is an ancestor of the named commit. This is the most common case especially when invoked from git pull: you
       are tracking an upstream repository, you have committed no local changes, and now you want to update to a newer upstream revision. In this
       case, a new commit is not needed to store the combined history; instead, the HEAD (along with the index) is updated to point at the named
       commit, without creating an extra merge commit.

       This behavior can be suppressed with the --no-ff option.

       Except in a fast-forward merge (see above), the branches to be merged must be tied together by a merge commit that has both of them as its

       A merged version reconciling the changes from all branches to be merged is committed, and your HEAD, index, and working tree are updated to
       it. It is possible to have modifications in the working tree as long as they do not overlap; the update will preserve them.

       When it is not obvious how to reconcile the changes, the following happens:

	1. The HEAD pointer stays the same.

	2. The MERGE_HEAD ref is set to point to the other branch head.

	3. Paths that merged cleanly are updated both in the index file and in your working tree.

	4. For conflicting paths, the index file records up to three versions: stage 1 stores the version from the common ancestor, stage 2 from
	   HEAD, and stage 3 from MERGE_HEAD (you can inspect the stages with git ls-files -u). The working tree files contain the result of the
	   "merge" program; i.e. 3-way merge results with familiar conflict markers <<< === >>>.

	5. No other changes are made. In particular, the local modifications you had before you started merge will stay the same and the index
	   entries for them stay as they were, i.e. matching HEAD.

       If you tried a merge which resulted in complex conflicts and want to start over, you can recover with git merge --abort.

       When merging an annotated (and possibly signed) tag, Git always creates a merge commit even if a fast-forward merge is possible, and the
       commit message template is prepared with the tag message. Additionally, if the tag is signed, the signature check is reported as a comment
       in the message template. See also git-tag(1).

       When you want to just integrate with the work leading to the commit that happens to be tagged, e.g. synchronizing with an upstream release
       point, you may not want to make an unnecessary merge commit.

       In such a case, you can "unwrap" the tag yourself before feeding it to git merge, or pass --ff-only when you do not have any work on your
       own. e.g.

	   git fetch origin
	   git merge v1.2.3^0
	   git merge --ff-only v1.2.3

       During a merge, the working tree files are updated to reflect the result of the merge. Among the changes made to the common ancestor's
       version, non-overlapping ones (that is, you changed an area of the file while the other side left that area intact, or vice versa) are
       incorporated in the final result verbatim. When both sides made changes to the same area, however, Git cannot randomly pick one side over
       the other, and asks you to resolve it by leaving what both sides did to that area.

       By default, Git uses the same style as the one used by the "merge" program from the RCS suite to present such a conflicted hunk, like this:

	   Here are lines that are either unchanged from the common
	   ancestor, or cleanly resolved because only one side changed.
	   <<<<<<< yours:sample.txt
	   Conflict resolution is hard;
	   let's go shopping.
	   Git makes conflict resolution easy.
	   >>>>>>> theirs:sample.txt
	   And here is another line that is cleanly resolved or unmodified.

       The area where a pair of conflicting changes happened is marked with markers <<<<<<<, =======, and >>>>>>>. The part before the ======= is
       typically your side, and the part afterwards is typically their side.

       The default format does not show what the original said in the conflicting area. You cannot tell how many lines are deleted and replaced
       with Barbie's remark on your side. The only thing you can tell is that your side wants to say it is hard and you'd prefer to go shopping,
       while the other side wants to claim it is easy.

       An alternative style can be used by setting the "merge.conflictStyle" configuration variable to "diff3". In "diff3" style, the above
       conflict may look like this:

	   Here are lines that are either unchanged from the common
	   ancestor, or cleanly resolved because only one side changed.
	   <<<<<<< yours:sample.txt
	   Conflict resolution is hard;
	   let's go shopping.
	   Conflict resolution is hard.
	   Git makes conflict resolution easy.
	   >>>>>>> theirs:sample.txt
	   And here is another line that is cleanly resolved or unmodified.

       In addition to the <<<<<<<, =======, and >>>>>>> markers, it uses another ||||||| marker that is followed by the original text. You can
       tell that the original just stated a fact, and your side simply gave in to that statement and gave up, while the other side tried to have a
       more positive attitude. You can sometimes come up with a better resolution by viewing the original.

       After seeing a conflict, you can do two things:

       o   Decide not to merge. The only clean-ups you need are to reset the index file to the HEAD commit to reverse 2. and to clean up working
	   tree changes made by 2. and 3.; git merge --abort can be used for this.

       o   Resolve the conflicts. Git will mark the conflicts in the working tree. Edit the files into shape and git add them to the index. Use
	   git commit or git merge --continue to seal the deal. The latter command checks whether there is a (interrupted) merge in progress
	   before calling git commit.

       You can work through the conflict with a number of tools:

       o   Use a mergetool.  git mergetool to launch a graphical mergetool which will work you through the merge.

       o   Look at the diffs.  git diff will show a three-way diff, highlighting changes from both the HEAD and MERGE_HEAD versions.

       o   Look at the diffs from each branch.	git log --merge -p <path> will show diffs first for the HEAD version and then the MERGE_HEAD

       o   Look at the originals.  git show :1:filename shows the common ancestor, git show :2:filename shows the HEAD version, and git show
	   :3:filename shows the MERGE_HEAD version.

       o   Merge branches fixes and enhancements on top of the current branch, making an octopus merge:

	       $ git merge fixes enhancements

       o   Merge branch obsolete into the current branch, using ours merge strategy:

	       $ git merge -s ours obsolete

       o   Merge branch maint into the current branch, but do not make a new commit automatically:

	       $ git merge --no-commit maint

	   This can be used when you want to include further changes to the merge, or want to write your own merge commit message.

	   You should refrain from abusing this option to sneak substantial changes into a merge commit. Small fixups like bumping release/version
	   name would be acceptable.

       The merge mechanism (git merge and git pull commands) allows the backend merge strategies to be chosen with -s option. Some strategies can
       also take their own options, which can be passed by giving -X<option> arguments to git merge and/or git pull.

	   This can only resolve two heads (i.e. the current branch and another branch you pulled from) using a 3-way merge algorithm. It tries to
	   carefully detect criss-cross merge ambiguities and is considered generally safe and fast.

	   This can only resolve two heads using a 3-way merge algorithm. When there is more than one common ancestor that can be used for 3-way
	   merge, it creates a merged tree of the common ancestors and uses that as the reference tree for the 3-way merge. This has been reported
	   to result in fewer merge conflicts without causing mismerges by tests done on actual merge commits taken from Linux 2.6 kernel
	   development history. Additionally this can detect and handle merges involving renames. This is the default merge strategy when pulling
	   or merging one branch.

	   The recursive strategy can take the following options:

	       This option forces conflicting hunks to be auto-resolved cleanly by favoring our version. Changes from the other tree that do not
	       conflict with our side are reflected to the merge result. For a binary file, the entire contents are taken from our side.

	       This should not be confused with the ours merge strategy, which does not even look at what the other tree contains at all. It
	       discards everything the other tree did, declaring our history contains all that happened in it.

	       This is the opposite of ours; note that, unlike ours, there is no theirs merge strategy to confuse this merge option with.

	       With this option, merge-recursive spends a little extra time to avoid mismerges that sometimes occur due to unimportant matching
	       lines (e.g., braces from distinct functions). Use this when the branches to be merged have diverged wildly. See also git-diff(1)

	       Tells merge-recursive to use a different diff algorithm, which can help avoid mismerges that occur due to unimportant matching
	       lines (such as braces from distinct functions). See also git-diff(1) --diff-algorithm.

	   ignore-space-change, ignore-all-space, ignore-space-at-eol, ignore-cr-at-eol
	       Treats lines with the indicated type of whitespace change as unchanged for the sake of a three-way merge. Whitespace changes mixed
	       with other changes to a line are not ignored. See also git-diff(1) -b, -w, --ignore-space-at-eol, and --ignore-cr-at-eol.

	       o   If their version only introduces whitespace changes to a line, our version is used;

	       o   If our version introduces whitespace changes but their version includes a substantial change, their version is used;

	       o   Otherwise, the merge proceeds in the usual way.

	       This runs a virtual check-out and check-in of all three stages of a file when resolving a three-way merge. This option is meant to
	       be used when merging branches with different clean filters or end-of-line normalization rules. See "Merging branches with differing
	       checkin/checkout attributes" in gitattributes(5) for details.

	       Disables the renormalize option. This overrides the merge.renormalize configuration variable.

	       Turn off rename detection. See also git-diff(1) --no-renames.

	       Turn on rename detection, optionally setting the similarity threshold. This is the default. See also git-diff(1) --find-renames.

	       Deprecated synonym for find-renames=<n>.

	       This option is a more advanced form of subtree strategy, where the strategy makes a guess on how two trees must be shifted to match
	       with each other when merging. Instead, the specified path is prefixed (or stripped from the beginning) to make the shape of two
	       trees to match.

	   This resolves cases with more than two heads, but refuses to do a complex merge that needs manual resolution. It is primarily meant to
	   be used for bundling topic branch heads together. This is the default merge strategy when pulling or merging more than one branch.

	   This resolves any number of heads, but the resulting tree of the merge is always that of the current branch head, effectively ignoring
	   all changes from all other branches. It is meant to be used to supersede old development history of side branches. Note that this is
	   different from the -Xours option to the recursive merge strategy.

	   This is a modified recursive strategy. When merging trees A and B, if B corresponds to a subtree of A, B is first adjusted to match the
	   tree structure of A, instead of reading the trees at the same level. This adjustment is also done to the common ancestor tree.

       With the strategies that use 3-way merge (including the default, recursive), if a change is made on both branches, but later reverted on
       one of the branches, that change will be present in the merged result; some people find this behavior confusing. It occurs because only the
       heads and the merge base are considered when performing a merge, not the individual commits. The merge algorithm therefore considers the
       reverted change as no change at all, and substitutes the changed version instead.

	   Specify the style in which conflicted hunks are written out to working tree files upon merge. The default is "merge", which shows a
	   <<<<<<< conflict marker, changes made by one side, a ======= marker, changes made by the other side, and then a >>>>>>> marker. An
	   alternate style, "diff3", adds a ||||||| marker and the original text before the ======= marker.

	   If merge is called without any commit argument, merge the upstream branches configured for the current branch by using their last
	   observed values stored in their remote-tracking branches. The values of the branch.<current branch>.merge that name the branches at the
	   remote named by branch.<current branch>.remote are consulted, and then they are mapped via remote.<remote>.fetch to their corresponding
	   remote-tracking branches, and the tips of these tracking branches are merged.

	   By default, Git does not create an extra merge commit when merging a commit that is a descendant of the current commit. Instead, the
	   tip of the current branch is fast-forwarded. When set to false, this variable tells Git to create an extra merge commit in such a case
	   (equivalent to giving the --no-ff option from the command line). When set to only, only such fast-forward merges are allowed
	   (equivalent to giving the --ff-only option from the command line).

	   If true, this is equivalent to the --verify-signatures command line option. See git-merge(1) for details.

	   In addition to branch names, populate the log message with the branch description text associated with them. Defaults to false.

	   In addition to branch names, populate the log message with at most the specified number of one-line descriptions from the actual
	   commits that are being merged. Defaults to false, and true is a synonym for 20.

	   The number of files to consider when performing rename detection during a merge; if not specified, defaults to the value of

	   Tell Git that canonical representation of files in the repository has changed over time (e.g. earlier commits record text files with
	   CRLF line endings, but recent ones use LF line endings). In such a repository, Git can convert the data recorded in commits to a
	   canonical form before performing a merge to reduce unnecessary conflicts. For more information, see section "Merging branches with
	   differing checkin/checkout attributes" in gitattributes(5).

	   Whether to print the diffstat between ORIG_HEAD and the merge result at the end of the merge. True by default.

	   Controls which merge tool is used by git-mergetool(1). The list below shows the valid built-in values. Any other value is treated as a
	   custom merge tool and requires that a corresponding mergetool.<tool>.cmd variable is defined.

	   o   araxis

	   o   bc

	   o   bc3

	   o   codecompare

	   o   deltawalker

	   o   diffmerge

	   o   diffuse

	   o   ecmerge

	   o   emerge

	   o   examdiff

	   o   gvimdiff

	   o   gvimdiff2

	   o   gvimdiff3

	   o   kdiff3

	   o   meld

	   o   opendiff

	   o   p4merge

	   o   tkdiff

	   o   tortoisemerge

	   o   vimdiff

	   o   vimdiff2

	   o   vimdiff3

	   o   winmerge

	   o   xxdiff

	   Controls the amount of output shown by the recursive merge strategy. Level 0 outputs nothing except a final error message if conflicts
	   were detected. Level 1 outputs only conflicts, 2 outputs conflicts and file changes. Level 5 and above outputs debugging information.
	   The default is level 2. Can be overridden by the GIT_MERGE_VERBOSITY environment variable.

	   Defines a human-readable name for a custom low-level merge driver. See gitattributes(5) for details.

	   Defines the command that implements a custom low-level merge driver. See gitattributes(5) for details.

	   Names a low-level merge driver to be used when performing an internal merge between common ancestors. See gitattributes(5) for details.

	   Sets default options for merging into branch <name>. The syntax and supported options are the same as those of git merge, but option
	   values containing whitespace characters are currently not supported.

       git-fmt-merge-msg(1), git-pull(1), gitattributes(5), git-reset(1), git-diff(1), git-ls-files(1), git-add(1), git-rm(1), git-mergetool(1)

       Part of the git(1) suite

Git 2.17.1							    10/05/2018							      GIT-MERGE(1)

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