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NAME

       git-checkout - Checkout a branch or paths to the working tree

SYNOPSIS

       git checkout [-q] [-f] [-m] [<branch>]
       git checkout [-q] [-f] [-m] [--detach] [<commit>]
       git checkout [-q] [-f] [-m] [[-b|-B|--orphan] <new_branch>] [<start_point>]
       git checkout [-f|--ours|--theirs|-m|--conflict=<style>] [<tree-ish>] [--] <paths>...
       git checkout [-p|--patch] [<tree-ish>] [--] [<paths>...]

DESCRIPTION

       Updates files in the working tree to match the version in the index or the specified tree.
       If no paths are given, git checkout will also update HEAD to set the specified branch as
       the current branch.

       git checkout [<branch>], git checkout -b|-B <new_branch> [<start point>], git checkout
       [--detach] [<commit>]
           This form switches branches by updating the index, working tree, and HEAD to reflect
           the specified branch or commit.

           If -b is given, a new branch is created as if git-branch(1) were called and then
           checked out; in this case you can use the --track or --no-track options, which will be
           passed to git branch. As a convenience, --track without -b implies branch creation;
           see the description of --track below.

           If -B is given, <new_branch> is created if it doesn’t exist; otherwise, it is reset.
           This is the transactional equivalent of

               $ git branch -f <branch> [<start point>]
               $ git checkout <branch>

           that is to say, the branch is not reset/created unless "git checkout" is successful.

       git checkout [-p|--patch] [<tree-ish>] [--] <pathspec>...
           When <paths> or --patch are given, git checkout does not switch branches. It updates
           the named paths in the working tree from the index file or from a named <tree-ish>
           (most often a commit). In this case, the -b and --track options are meaningless and
           giving either of them results in an error. The <tree-ish> argument can be used to
           specify a specific tree-ish (i.e. commit, tag or tree) to update the index for the
           given paths before updating the working tree.

           The index may contain unmerged entries because of a previous failed merge. By default,
           if you try to check out such an entry from the index, the checkout operation will fail
           and nothing will be checked out. Using -f will ignore these unmerged entries. The
           contents from a specific side of the merge can be checked out of the index by using
           --ours or --theirs. With -m, changes made to the working tree file can be discarded to
           re-create the original conflicted merge result.

OPTIONS

       -q, --quiet
           Quiet, suppress feedback messages.

       -f, --force
           When switching branches, proceed even if the index or the working tree differs from
           HEAD. This is used to throw away local changes.

           When checking out paths from the index, do not fail upon unmerged entries; instead,
           unmerged entries are ignored.

       --ours, --theirs
           When checking out paths from the index, check out stage #2 (ours) or #3 (theirs) for
           unmerged paths.

       -b
           Create a new branch named <new_branch> and start it at <start_point>; see git-
           branch(1) for details.

       -B
           Creates the branch <new_branch> and start it at <start_point>; if it already exists,
           then reset it to <start_point>. This is equivalent to running "git branch" with "-f";
           see git-branch(1) for details.

       -t, --track
           When creating a new branch, set up "upstream" configuration. See "--track" in git-
           branch(1) for details.

           If no -b option is given, the name of the new branch will be derived from the
           remote-tracking branch. If "remotes/" or "refs/remotes/" is prefixed it is stripped
           away, and then the part up to the next slash (which would be the nickname of the
           remote) is removed. This would tell us to use "hack" as the local branch when
           branching off of "origin/hack" (or "remotes/origin/hack", or even
           "refs/remotes/origin/hack"). If the given name has no slash, or the above guessing
           results in an empty name, the guessing is aborted. You can explicitly give a name with
           -b in such a case.

       --no-track
           Do not set up "upstream" configuration, even if the branch.autosetupmerge
           configuration variable is true.

       -l
           Create the new branch’s reflog; see git-branch(1) for details.

       --detach
           Rather than checking out a branch to work on it, check out a commit for inspection and
           discardable experiments. This is the default behavior of "git checkout <commit>" when
           <commit> is not a branch name. See the "DETACHED HEAD" section below for details.

       --orphan
           Create a new orphan branch, named <new_branch>, started from <start_point> and switch
           to it. The first commit made on this new branch will have no parents and it will be
           the root of a new history totally disconnected from all the other branches and
           commits.

           The index and the working tree are adjusted as if you had previously run "git checkout
           <start_point>". This allows you to start a new history that records a set of paths
           similar to <start_point> by easily running "git commit -a" to make the root commit.

           This can be useful when you want to publish the tree from a commit without exposing
           its full history. You might want to do this to publish an open source branch of a
           project whose current tree is "clean", but whose full history contains proprietary or
           otherwise encumbered bits of code.

           If you want to start a disconnected history that records a set of paths that is
           totally different from the one of <start_point>, then you should clear the index and
           the working tree right after creating the orphan branch by running "git rm -rf ." from
           the top level of the working tree. Afterwards you will be ready to prepare your new
           files, repopulating the working tree, by copying them from elsewhere, extracting a
           tarball, etc.

       -m, --merge
           When switching branches, if you have local modifications to one or more files that are
           different between the current branch and the branch to which you are switching, the
           command refuses to switch branches in order to preserve your modifications in context.
           However, with this option, a three-way merge between the current branch, your working
           tree contents, and the new branch is done, and you will be on the new branch.

           When a merge conflict happens, the index entries for conflicting paths are left
           unmerged, and you need to resolve the conflicts and mark the resolved paths with git
           add (or git rm if the merge should result in deletion of the path).

           When checking out paths from the index, this option lets you recreate the conflicted
           merge in the specified paths.

       --conflict=<style>
           The same as --merge option above, but changes the way the conflicting hunks are
           presented, overriding the merge.conflictstyle configuration variable. Possible values
           are "merge" (default) and "diff3" (in addition to what is shown by "merge" style,
           shows the original contents).

       -p, --patch
           Interactively select hunks in the difference between the <tree-ish> (or the index, if
           unspecified) and the working tree. The chosen hunks are then applied in reverse to the
           working tree (and if a <tree-ish> was specified, the index).

           This means that you can use git checkout -p to selectively discard edits from your
           current working tree. See the “Interactive Mode” section of git-add(1) to learn how to
           operate the --patch mode.

       <branch>
           Branch to checkout; if it refers to a branch (i.e., a name that, when prepended with
           "refs/heads/", is a valid ref), then that branch is checked out. Otherwise, if it
           refers to a valid commit, your HEAD becomes "detached" and you are no longer on any
           branch (see below for details).

           As a special case, the "@{-N}" syntax for the N-th last branch checks out the branch
           (instead of detaching). You may also specify - which is synonymous with "@{-1}".

           As a further special case, you may use "A...B" as a shortcut for the merge base of A
           and B if there is exactly one merge base. You can leave out at most one of A and B, in
           which case it defaults to HEAD.

       <new_branch>
           Name for the new branch.

       <start_point>
           The name of a commit at which to start the new branch; see git-branch(1) for details.
           Defaults to HEAD.

       <tree-ish>
           Tree to checkout from (when paths are given). If not specified, the index will be
           used.

DETACHED HEAD

       HEAD normally refers to a named branch (e.g. master). Meanwhile, each branch refers to a
       specific commit. Let’s look at a repo with three commits, one of them tagged, and with
       branch master checked out:

                      HEAD (refers to branch 'master')
                       |
                       v
           a---b---c  branch 'master' (refers to commit 'c')
               ^
               |
             tag 'v2.0' (refers to commit 'b')

       When a commit is created in this state, the branch is updated to refer to the new commit.
       Specifically, git commit creates a new commit d, whose parent is commit c, and then
       updates branch master to refer to new commit d. HEAD still refers to branch master and so
       indirectly now refers to commit d:

           $ edit; git add; git commit

                          HEAD (refers to branch 'master')
                           |
                           v
           a---b---c---d  branch 'master' (refers to commit 'd')
               ^
               |
             tag 'v2.0' (refers to commit 'b')

       It is sometimes useful to be able to checkout a commit that is not at the tip of any named
       branch, or even to create a new commit that is not referenced by a named branch. Let’s
       look at what happens when we checkout commit b (here we show two ways this may be done):

           $ git checkout v2.0  # or
           $ git checkout master^^

              HEAD (refers to commit 'b')
               |
               v
           a---b---c---d  branch 'master' (refers to commit 'd')
               ^
               |
             tag 'v2.0' (refers to commit 'b')

       Notice that regardless of which checkout command we use, HEAD now refers directly to
       commit b. This is known as being in detached HEAD state. It means simply that HEAD refers
       to a specific commit, as opposed to referring to a named branch. Let’s see what happens
       when we create a commit:

           $ edit; git add; git commit

                HEAD (refers to commit 'e')
                 |
                 v
                 e
                /
           a---b---c---d  branch 'master' (refers to commit 'd')
               ^
               |
             tag 'v2.0' (refers to commit 'b')

       There is now a new commit e, but it is referenced only by HEAD. We can of course add yet
       another commit in this state:

           $ edit; git add; git commit

                    HEAD (refers to commit 'f')
                     |
                     v
                 e---f
                /
           a---b---c---d  branch 'master' (refers to commit 'd')
               ^
               |
             tag 'v2.0' (refers to commit 'b')

       In fact, we can perform all the normal git operations. But, let’s look at what happens
       when we then checkout master:

           $ git checkout master

                          HEAD (refers to branch 'master')
                 e---f     |
                /          v
           a---b---c---d  branch 'master' (refers to commit 'd')
               ^
               |
             tag 'v2.0' (refers to commit 'b')

       It is important to realize that at this point nothing refers to commit f. Eventually
       commit f (and by extension commit e) will be deleted by the routine git garbage collection
       process, unless we create a reference before that happens. If we have not yet moved away
       from commit f, any of these will create a reference to it:

           $ git checkout -b foo   (1)
           $ git branch foo        (2)
           $ git tag foo           (3)

       1. creates a new branch foo, which refers to commit f, and then updates HEAD to refer to
       branch foo. In other words, we’ll no longer be in detached HEAD state after this command.
       2. similarly creates a new branch foo, which refers to commit f, but leaves HEAD detached.
       3. creates a new tag foo, which refers to commit f, leaving HEAD detached.

       If we have moved away from commit f, then we must first recover its object name (typically
       by using git reflog), and then we can create a reference to it. For example, to see the
       last two commits to which HEAD referred, we can use either of these commands:

           $ git reflog -2 HEAD # or
           $ git log -g -2 HEAD

EXAMPLES

        1. The following sequence checks out the master branch, reverts the Makefile to two
           revisions back, deletes hello.c by mistake, and gets it back from the index.

               $ git checkout master             (1)
               $ git checkout master~2 Makefile  (2)
               $ rm -f hello.c
               $ git checkout hello.c            (3)

           1. switch branch
           2. take a file out of another commit
           3. restore hello.c from the index

           If you have an unfortunate branch that is named hello.c, this step would be confused
           as an instruction to switch to that branch. You should instead write:

               $ git checkout -- hello.c

        2. After working in the wrong branch, switching to the correct branch would be done
           using:

               $ git checkout mytopic

           However, your "wrong" branch and correct "mytopic" branch may differ in files that you
           have modified locally, in which case the above checkout would fail like this:

               $ git checkout mytopic
               error: You have local changes to 'frotz'; not switching branches.

           You can give the -m flag to the command, which would try a three-way merge:

               $ git checkout -m mytopic
               Auto-merging frotz

           After this three-way merge, the local modifications are not registered in your index
           file, so git diff would show you what changes you made since the tip of the new
           branch.

        3. When a merge conflict happens during switching branches with the -m option, you would
           see something like this:

               $ git checkout -m mytopic
               Auto-merging frotz
               ERROR: Merge conflict in frotz
               fatal: merge program failed

           At this point, git diff shows the changes cleanly merged as in the previous example,
           as well as the changes in the conflicted files. Edit and resolve the conflict and mark
           it resolved with git add as usual:

               $ edit frotz
               $ git add frotz

GIT

       Part of the git(1) suite