Documentation / git.txton commit Sync with v2.2.1 (3f15098)
   1git(1)
   2======
   3
   4NAME
   5----
   6git - the stupid content tracker
   7
   8
   9SYNOPSIS
  10--------
  11[verse]
  12'git' [--version] [--help] [-C <path>] [-c <name>=<value>]
  13    [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]
  14    [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]
  15    [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]
  16    <command> [<args>]
  17
  18DESCRIPTION
  19-----------
  20Git is a fast, scalable, distributed revision control system with an
  21unusually rich command set that provides both high-level operations
  22and full access to internals.
  23
  24See linkgit:gittutorial[7] to get started, then see
  25linkgit:giteveryday[7] for a useful minimum set of
  26commands.  The link:user-manual.html[Git User's Manual] has a more
  27in-depth introduction.
  28
  29After you mastered the basic concepts, you can come back to this
  30page to learn what commands Git offers.  You can learn more about
  31individual Git commands with "git help command".  linkgit:gitcli[7]
  32manual page gives you an overview of the command-line command syntax.
  33
  34Formatted and hyperlinked version of the latest Git documentation
  35can be viewed at `http://git-htmldocs.googlecode.com/git/git.html`.
  36
  37ifdef::stalenotes[]
  38[NOTE]
  39============
  40
  41You are reading the documentation for the latest (possibly
  42unreleased) version of Git, that is available from the 'master'
  43branch of the `git.git` repository.
  44Documentation for older releases are available here:
  45
  46* link:v2.2.1/git.html[documentation for release 2.2.1]
  47
  48* release notes for
  49  link:RelNotes/2.2.1.txt[2.2.1],
  50  link:RelNotes/2.2.0.txt[2.2].
  51
  52* link:v2.1.4/git.html[documentation for release 2.1.4]
  53
  54* release notes for
  55  link:RelNotes/2.1.4.txt[2.1.4],
  56  link:RelNotes/2.1.3.txt[2.1.3],
  57  link:RelNotes/2.1.2.txt[2.1.2],
  58  link:RelNotes/2.1.1.txt[2.1.1],
  59  link:RelNotes/2.1.0.txt[2.1].
  60
  61* link:v2.0.5/git.html[documentation for release 2.0.5]
  62
  63* release notes for
  64  link:RelNotes/2.0.5.txt[2.0.5],
  65  link:RelNotes/2.0.4.txt[2.0.4],
  66  link:RelNotes/2.0.3.txt[2.0.3],
  67  link:RelNotes/2.0.2.txt[2.0.2],
  68  link:RelNotes/2.0.1.txt[2.0.1],
  69  link:RelNotes/2.0.0.txt[2.0.0].
  70
  71* link:v1.9.5/git.html[documentation for release 1.9.5]
  72
  73* release notes for
  74  link:RelNotes/1.9.5.txt[1.9.5],
  75  link:RelNotes/1.9.4.txt[1.9.4],
  76  link:RelNotes/1.9.3.txt[1.9.3],
  77  link:RelNotes/1.9.2.txt[1.9.2],
  78  link:RelNotes/1.9.1.txt[1.9.1],
  79  link:RelNotes/1.9.0.txt[1.9.0].
  80
  81* link:v1.8.5.6/git.html[documentation for release 1.8.5.6]
  82
  83* release notes for
  84  link:RelNotes/1.8.5.6.txt[1.8.5.6],
  85  link:RelNotes/1.8.5.5.txt[1.8.5.5],
  86  link:RelNotes/1.8.5.4.txt[1.8.5.4],
  87  link:RelNotes/1.8.5.3.txt[1.8.5.3],
  88  link:RelNotes/1.8.5.2.txt[1.8.5.2],
  89  link:RelNotes/1.8.5.1.txt[1.8.5.1],
  90  link:RelNotes/1.8.5.txt[1.8.5].
  91
  92* link:v1.8.4.5/git.html[documentation for release 1.8.4.5]
  93
  94* release notes for
  95  link:RelNotes/1.8.4.5.txt[1.8.4.5],
  96  link:RelNotes/1.8.4.4.txt[1.8.4.4],
  97  link:RelNotes/1.8.4.3.txt[1.8.4.3],
  98  link:RelNotes/1.8.4.2.txt[1.8.4.2],
  99  link:RelNotes/1.8.4.1.txt[1.8.4.1],
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 109  link:RelNotes/1.8.3.txt[1.8.3].
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 419  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 420  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 421  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 422  link:RelNotes/1.5.0.txt[1.5.0].
 423
 424* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 425  link:v1.3.3/git.html[1.3.3],
 426  link:v1.2.6/git.html[1.2.6],
 427  link:v1.0.13/git.html[1.0.13].
 428
 429============
 430
 431endif::stalenotes[]
 432
 433OPTIONS
 434-------
 435--version::
 436        Prints the Git suite version that the 'git' program came from.
 437
 438--help::
 439        Prints the synopsis and a list of the most commonly used
 440        commands. If the option '--all' or '-a' is given then all
 441        available commands are printed. If a Git command is named this
 442        option will bring up the manual page for that command.
 443+
 444Other options are available to control how the manual page is
 445displayed. See linkgit:git-help[1] for more information,
 446because `git --help ...` is converted internally into `git
 447help ...`.
 448
 449-C <path>::
 450        Run as if git was started in '<path>' instead of the current working
 451        directory.  When multiple `-C` options are given, each subsequent
 452        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 453        <path>`.
 454+
 455This option affects options that expect path name like `--git-dir` and
 456`--work-tree` in that their interpretations of the path names would be
 457made relative to the working directory caused by the `-C` option. For
 458example the following invocations are equivalent:
 459
 460    git --git-dir=a.git --work-tree=b -C c status
 461    git --git-dir=c/a.git --work-tree=c/b status
 462
 463-c <name>=<value>::
 464        Pass a configuration parameter to the command. The value
 465        given will override values from configuration files.
 466        The <name> is expected in the same format as listed by
 467        'git config' (subkeys separated by dots).
 468+
 469Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 470`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 471config file). Including the equals but with an empty value (like `git -c
 472foo.bar= ...`) sets `foo.bar` to the empty string.
 473
 474--exec-path[=<path>]::
 475        Path to wherever your core Git programs are installed.
 476        This can also be controlled by setting the GIT_EXEC_PATH
 477        environment variable. If no path is given, 'git' will print
 478        the current setting and then exit.
 479
 480--html-path::
 481        Print the path, without trailing slash, where Git's HTML
 482        documentation is installed and exit.
 483
 484--man-path::
 485        Print the manpath (see `man(1)`) for the man pages for
 486        this version of Git and exit.
 487
 488--info-path::
 489        Print the path where the Info files documenting this
 490        version of Git are installed and exit.
 491
 492-p::
 493--paginate::
 494        Pipe all output into 'less' (or if set, $PAGER) if standard
 495        output is a terminal.  This overrides the `pager.<cmd>`
 496        configuration options (see the "Configuration Mechanism" section
 497        below).
 498
 499--no-pager::
 500        Do not pipe Git output into a pager.
 501
 502--git-dir=<path>::
 503        Set the path to the repository. This can also be controlled by
 504        setting the GIT_DIR environment variable. It can be an absolute
 505        path or relative path to current working directory.
 506
 507--work-tree=<path>::
 508        Set the path to the working tree. It can be an absolute path
 509        or a path relative to the current working directory.
 510        This can also be controlled by setting the GIT_WORK_TREE
 511        environment variable and the core.worktree configuration
 512        variable (see core.worktree in linkgit:git-config[1] for a
 513        more detailed discussion).
 514
 515--namespace=<path>::
 516        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 517        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 518        variable.
 519
 520--bare::
 521        Treat the repository as a bare repository.  If GIT_DIR
 522        environment is not set, it is set to the current working
 523        directory.
 524
 525--no-replace-objects::
 526        Do not use replacement refs to replace Git objects. See
 527        linkgit:git-replace[1] for more information.
 528
 529--literal-pathspecs::
 530        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 531        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 532        variable to `1`.
 533
 534--glob-pathspecs::
 535        Add "glob" magic to all pathspec. This is equivalent to setting
 536        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 537        globbing on individual pathspecs can be done using pathspec
 538        magic ":(literal)"
 539
 540--noglob-pathspecs::
 541        Add "literal" magic to all pathspec. This is equivalent to setting
 542        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 543        globbing on individual pathspecs can be done using pathspec
 544        magic ":(glob)"
 545
 546--icase-pathspecs::
 547        Add "icase" magic to all pathspec. This is equivalent to setting
 548        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 549
 550GIT COMMANDS
 551------------
 552
 553We divide Git into high level ("porcelain") commands and low level
 554("plumbing") commands.
 555
 556High-level commands (porcelain)
 557-------------------------------
 558
 559We separate the porcelain commands into the main commands and some
 560ancillary user utilities.
 561
 562Main porcelain commands
 563~~~~~~~~~~~~~~~~~~~~~~~
 564
 565include::cmds-mainporcelain.txt[]
 566
 567Ancillary Commands
 568~~~~~~~~~~~~~~~~~~
 569Manipulators:
 570
 571include::cmds-ancillarymanipulators.txt[]
 572
 573Interrogators:
 574
 575include::cmds-ancillaryinterrogators.txt[]
 576
 577
 578Interacting with Others
 579~~~~~~~~~~~~~~~~~~~~~~~
 580
 581These commands are to interact with foreign SCM and with other
 582people via patch over e-mail.
 583
 584include::cmds-foreignscminterface.txt[]
 585
 586
 587Low-level commands (plumbing)
 588-----------------------------
 589
 590Although Git includes its
 591own porcelain layer, its low-level commands are sufficient to support
 592development of alternative porcelains.  Developers of such porcelains
 593might start by reading about linkgit:git-update-index[1] and
 594linkgit:git-read-tree[1].
 595
 596The interface (input, output, set of options and the semantics)
 597to these low-level commands are meant to be a lot more stable
 598than Porcelain level commands, because these commands are
 599primarily for scripted use.  The interface to Porcelain commands
 600on the other hand are subject to change in order to improve the
 601end user experience.
 602
 603The following description divides
 604the low-level commands into commands that manipulate objects (in
 605the repository, index, and working tree), commands that interrogate and
 606compare objects, and commands that move objects and references between
 607repositories.
 608
 609
 610Manipulation commands
 611~~~~~~~~~~~~~~~~~~~~~
 612
 613include::cmds-plumbingmanipulators.txt[]
 614
 615
 616Interrogation commands
 617~~~~~~~~~~~~~~~~~~~~~~
 618
 619include::cmds-plumbinginterrogators.txt[]
 620
 621In general, the interrogate commands do not touch the files in
 622the working tree.
 623
 624
 625Synching repositories
 626~~~~~~~~~~~~~~~~~~~~~
 627
 628include::cmds-synchingrepositories.txt[]
 629
 630The following are helper commands used by the above; end users
 631typically do not use them directly.
 632
 633include::cmds-synchelpers.txt[]
 634
 635
 636Internal helper commands
 637~~~~~~~~~~~~~~~~~~~~~~~~
 638
 639These are internal helper commands used by other commands; end
 640users typically do not use them directly.
 641
 642include::cmds-purehelpers.txt[]
 643
 644
 645Configuration Mechanism
 646-----------------------
 647
 648Git uses a simple text format to store customizations that are per
 649repository and are per user.  Such a configuration file may look
 650like this:
 651
 652------------
 653#
 654# A '#' or ';' character indicates a comment.
 655#
 656
 657; core variables
 658[core]
 659        ; Don't trust file modes
 660        filemode = false
 661
 662; user identity
 663[user]
 664        name = "Junio C Hamano"
 665        email = "gitster@pobox.com"
 666
 667------------
 668
 669Various commands read from the configuration file and adjust
 670their operation accordingly.  See linkgit:git-config[1] for a
 671list and more details about the configuration mechanism.
 672
 673
 674Identifier Terminology
 675----------------------
 676<object>::
 677        Indicates the object name for any type of object.
 678
 679<blob>::
 680        Indicates a blob object name.
 681
 682<tree>::
 683        Indicates a tree object name.
 684
 685<commit>::
 686        Indicates a commit object name.
 687
 688<tree-ish>::
 689        Indicates a tree, commit or tag object name.  A
 690        command that takes a <tree-ish> argument ultimately wants to
 691        operate on a <tree> object but automatically dereferences
 692        <commit> and <tag> objects that point at a <tree>.
 693
 694<commit-ish>::
 695        Indicates a commit or tag object name.  A
 696        command that takes a <commit-ish> argument ultimately wants to
 697        operate on a <commit> object but automatically dereferences
 698        <tag> objects that point at a <commit>.
 699
 700<type>::
 701        Indicates that an object type is required.
 702        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 703
 704<file>::
 705        Indicates a filename - almost always relative to the
 706        root of the tree structure `GIT_INDEX_FILE` describes.
 707
 708Symbolic Identifiers
 709--------------------
 710Any Git command accepting any <object> can also use the following
 711symbolic notation:
 712
 713HEAD::
 714        indicates the head of the current branch.
 715
 716<tag>::
 717        a valid tag 'name'
 718        (i.e. a `refs/tags/<tag>` reference).
 719
 720<head>::
 721        a valid head 'name'
 722        (i.e. a `refs/heads/<head>` reference).
 723
 724For a more complete list of ways to spell object names, see
 725"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 726
 727
 728File/Directory Structure
 729------------------------
 730
 731Please see the linkgit:gitrepository-layout[5] document.
 732
 733Read linkgit:githooks[5] for more details about each hook.
 734
 735Higher level SCMs may provide and manage additional information in the
 736`$GIT_DIR`.
 737
 738
 739Terminology
 740-----------
 741Please see linkgit:gitglossary[7].
 742
 743
 744Environment Variables
 745---------------------
 746Various Git commands use the following environment variables:
 747
 748The Git Repository
 749~~~~~~~~~~~~~~~~~~
 750These environment variables apply to 'all' core Git commands. Nb: it
 751is worth noting that they may be used/overridden by SCMS sitting above
 752Git so take care if using Cogito etc.
 753
 754'GIT_INDEX_FILE'::
 755        This environment allows the specification of an alternate
 756        index file. If not specified, the default of `$GIT_DIR/index`
 757        is used.
 758
 759'GIT_INDEX_VERSION'::
 760        This environment variable allows the specification of an index
 761        version for new repositories.  It won't affect existing index
 762        files.  By default index file version [23] is used.
 763
 764'GIT_OBJECT_DIRECTORY'::
 765        If the object storage directory is specified via this
 766        environment variable then the sha1 directories are created
 767        underneath - otherwise the default `$GIT_DIR/objects`
 768        directory is used.
 769
 770'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
 771        Due to the immutable nature of Git objects, old objects can be
 772        archived into shared, read-only directories. This variable
 773        specifies a ":" separated (on Windows ";" separated) list
 774        of Git object directories which can be used to search for Git
 775        objects. New objects will not be written to these directories.
 776
 777'GIT_DIR'::
 778        If the 'GIT_DIR' environment variable is set then it
 779        specifies a path to use instead of the default `.git`
 780        for the base of the repository.
 781        The '--git-dir' command-line option also sets this value.
 782
 783'GIT_WORK_TREE'::
 784        Set the path to the root of the working tree.
 785        This can also be controlled by the '--work-tree' command-line
 786        option and the core.worktree configuration variable.
 787
 788'GIT_NAMESPACE'::
 789        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 790        The '--namespace' command-line option also sets this value.
 791
 792'GIT_CEILING_DIRECTORIES'::
 793        This should be a colon-separated list of absolute paths.  If
 794        set, it is a list of directories that Git should not chdir up
 795        into while looking for a repository directory (useful for
 796        excluding slow-loading network directories).  It will not
 797        exclude the current working directory or a GIT_DIR set on the
 798        command line or in the environment.  Normally, Git has to read
 799        the entries in this list and resolve any symlink that
 800        might be present in order to compare them with the current
 801        directory.  However, if even this access is slow, you
 802        can add an empty entry to the list to tell Git that the
 803        subsequent entries are not symlinks and needn't be resolved;
 804        e.g.,
 805        'GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink'.
 806
 807'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
 808        When run in a directory that does not have ".git" repository
 809        directory, Git tries to find such a directory in the parent
 810        directories to find the top of the working tree, but by default it
 811        does not cross filesystem boundaries.  This environment variable
 812        can be set to true to tell Git not to stop at filesystem
 813        boundaries.  Like 'GIT_CEILING_DIRECTORIES', this will not affect
 814        an explicit repository directory set via 'GIT_DIR' or on the
 815        command line.
 816
 817Git Commits
 818~~~~~~~~~~~
 819'GIT_AUTHOR_NAME'::
 820'GIT_AUTHOR_EMAIL'::
 821'GIT_AUTHOR_DATE'::
 822'GIT_COMMITTER_NAME'::
 823'GIT_COMMITTER_EMAIL'::
 824'GIT_COMMITTER_DATE'::
 825'EMAIL'::
 826        see linkgit:git-commit-tree[1]
 827
 828Git Diffs
 829~~~~~~~~~
 830'GIT_DIFF_OPTS'::
 831        Only valid setting is "--unified=??" or "-u??" to set the
 832        number of context lines shown when a unified diff is created.
 833        This takes precedence over any "-U" or "--unified" option
 834        value passed on the Git diff command line.
 835
 836'GIT_EXTERNAL_DIFF'::
 837        When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
 838        program named by it is called, instead of the diff invocation
 839        described above.  For a path that is added, removed, or modified,
 840        'GIT_EXTERNAL_DIFF' is called with 7 parameters:
 841
 842        path old-file old-hex old-mode new-file new-hex new-mode
 843+
 844where:
 845
 846        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 847                         contents of <old|new>,
 848        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 849        <old|new>-mode:: are the octal representation of the file modes.
 850+
 851The file parameters can point at the user's working file
 852(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 853when a new file is added), or a temporary file (e.g. `old-file` in the
 854index).  'GIT_EXTERNAL_DIFF' should not worry about unlinking the
 855temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 856+
 857For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 858parameter, <path>.
 859+
 860For each path 'GIT_EXTERNAL_DIFF' is called, two environment variables,
 861'GIT_DIFF_PATH_COUNTER' and 'GIT_DIFF_PATH_TOTAL' are set.
 862
 863'GIT_DIFF_PATH_COUNTER'::
 864        A 1-based counter incremented by one for every path.
 865
 866'GIT_DIFF_PATH_TOTAL'::
 867        The total number of paths.
 868
 869other
 870~~~~~
 871'GIT_MERGE_VERBOSITY'::
 872        A number controlling the amount of output shown by
 873        the recursive merge strategy.  Overrides merge.verbosity.
 874        See linkgit:git-merge[1]
 875
 876'GIT_PAGER'::
 877        This environment variable overrides `$PAGER`. If it is set
 878        to an empty string or to the value "cat", Git will not launch
 879        a pager.  See also the `core.pager` option in
 880        linkgit:git-config[1].
 881
 882'GIT_EDITOR'::
 883        This environment variable overrides `$EDITOR` and `$VISUAL`.
 884        It is used by several Git commands when, on interactive mode,
 885        an editor is to be launched. See also linkgit:git-var[1]
 886        and the `core.editor` option in linkgit:git-config[1].
 887
 888'GIT_SSH'::
 889'GIT_SSH_COMMAND'::
 890        If either of these environment variables is set then 'git fetch'
 891        and 'git push' will use the specified command instead of 'ssh'
 892        when they need to connect to a remote system.
 893        The command will be given exactly two or four arguments: the
 894        'username@host' (or just 'host') from the URL and the shell
 895        command to execute on that remote system, optionally preceded by
 896        '-p' (literally) and the 'port' from the URL when it specifies
 897        something other than the default SSH port.
 898+
 899`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 900by the shell, which allows additional arguments to be included.
 901`$GIT_SSH` on the other hand must be just the path to a program
 902(which can be a wrapper shell script, if additional arguments are
 903needed).
 904+
 905Usually it is easier to configure any desired options through your
 906personal `.ssh/config` file.  Please consult your ssh documentation
 907for further details.
 908
 909'GIT_ASKPASS'::
 910        If this environment variable is set, then Git commands which need to
 911        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
 912        will call this program with a suitable prompt as command-line argument
 913        and read the password from its STDOUT. See also the 'core.askpass'
 914        option in linkgit:git-config[1].
 915
 916'GIT_CONFIG_NOSYSTEM'::
 917        Whether to skip reading settings from the system-wide
 918        `$(prefix)/etc/gitconfig` file.  This environment variable can
 919        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
 920        predictable environment for a picky script, or you can set it
 921        temporarily to avoid using a buggy `/etc/gitconfig` file while
 922        waiting for someone with sufficient permissions to fix it.
 923
 924'GIT_FLUSH'::
 925        If this environment variable is set to "1", then commands such
 926        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
 927        'git check-attr' and 'git check-ignore' will
 928        force a flush of the output stream after each record have been
 929        flushed. If this
 930        variable is set to "0", the output of these commands will be done
 931        using completely buffered I/O.   If this environment variable is
 932        not set, Git will choose buffered or record-oriented flushing
 933        based on whether stdout appears to be redirected to a file or not.
 934
 935'GIT_TRACE'::
 936        Enables general trace messages, e.g. alias expansion, built-in
 937        command execution and external command execution.
 938+
 939If this variable is set to "1", "2" or "true" (comparison
 940is case insensitive), trace messages will be printed to
 941stderr.
 942+
 943If the variable is set to an integer value greater than 2
 944and lower than 10 (strictly) then Git will interpret this
 945value as an open file descriptor and will try to write the
 946trace messages into this file descriptor.
 947+
 948Alternatively, if the variable is set to an absolute path
 949(starting with a '/' character), Git will interpret this
 950as a file path and will try to write the trace messages
 951into it.
 952+
 953Unsetting the variable, or setting it to empty, "0" or
 954"false" (case insensitive) disables trace messages.
 955
 956'GIT_TRACE_PACK_ACCESS'::
 957        Enables trace messages for all accesses to any packs. For each
 958        access, the pack file name and an offset in the pack is
 959        recorded. This may be helpful for troubleshooting some
 960        pack-related performance problems.
 961        See 'GIT_TRACE' for available trace output options.
 962
 963'GIT_TRACE_PACKET'::
 964        Enables trace messages for all packets coming in or out of a
 965        given program. This can help with debugging object negotiation
 966        or other protocol issues. Tracing is turned off at a packet
 967        starting with "PACK".
 968        See 'GIT_TRACE' for available trace output options.
 969
 970'GIT_TRACE_PERFORMANCE'::
 971        Enables performance related trace messages, e.g. total execution
 972        time of each Git command.
 973        See 'GIT_TRACE' for available trace output options.
 974
 975'GIT_TRACE_SETUP'::
 976        Enables trace messages printing the .git, working tree and current
 977        working directory after Git has completed its setup phase.
 978        See 'GIT_TRACE' for available trace output options.
 979
 980'GIT_TRACE_SHALLOW'::
 981        Enables trace messages that can help debugging fetching /
 982        cloning of shallow repositories.
 983        See 'GIT_TRACE' for available trace output options.
 984
 985GIT_LITERAL_PATHSPECS::
 986        Setting this variable to `1` will cause Git to treat all
 987        pathspecs literally, rather than as glob patterns. For example,
 988        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
 989        for commits that touch the path `*.c`, not any paths that the
 990        glob `*.c` matches. You might want this if you are feeding
 991        literal paths to Git (e.g., paths previously given to you by
 992        `git ls-tree`, `--raw` diff output, etc).
 993
 994GIT_GLOB_PATHSPECS::
 995        Setting this variable to `1` will cause Git to treat all
 996        pathspecs as glob patterns (aka "glob" magic).
 997
 998GIT_NOGLOB_PATHSPECS::
 999        Setting this variable to `1` will cause Git to treat all
1000        pathspecs as literal (aka "literal" magic).
1001
1002GIT_ICASE_PATHSPECS::
1003        Setting this variable to `1` will cause Git to treat all
1004        pathspecs as case-insensitive.
1005
1006'GIT_REFLOG_ACTION'::
1007        When a ref is updated, reflog entries are created to keep
1008        track of the reason why the ref was updated (which is
1009        typically the name of the high-level command that updated
1010        the ref), in addition to the old and new values of the ref.
1011        A scripted Porcelain command can use set_reflog_action
1012        helper function in `git-sh-setup` to set its name to this
1013        variable when it is invoked as the top level command by the
1014        end user, to be recorded in the body of the reflog.
1015
1016
1017Discussion[[Discussion]]
1018------------------------
1019
1020More detail on the following is available from the
1021link:user-manual.html#git-concepts[Git concepts chapter of the
1022user-manual] and linkgit:gitcore-tutorial[7].
1023
1024A Git project normally consists of a working directory with a ".git"
1025subdirectory at the top level.  The .git directory contains, among other
1026things, a compressed object database representing the complete history
1027of the project, an "index" file which links that history to the current
1028contents of the working tree, and named pointers into that history such
1029as tags and branch heads.
1030
1031The object database contains objects of three main types: blobs, which
1032hold file data; trees, which point to blobs and other trees to build up
1033directory hierarchies; and commits, which each reference a single tree
1034and some number of parent commits.
1035
1036The commit, equivalent to what other systems call a "changeset" or
1037"version", represents a step in the project's history, and each parent
1038represents an immediately preceding step.  Commits with more than one
1039parent represent merges of independent lines of development.
1040
1041All objects are named by the SHA-1 hash of their contents, normally
1042written as a string of 40 hex digits.  Such names are globally unique.
1043The entire history leading up to a commit can be vouched for by signing
1044just that commit.  A fourth object type, the tag, is provided for this
1045purpose.
1046
1047When first created, objects are stored in individual files, but for
1048efficiency may later be compressed together into "pack files".
1049
1050Named pointers called refs mark interesting points in history.  A ref
1051may contain the SHA-1 name of an object or the name of another ref.  Refs
1052with names beginning `ref/head/` contain the SHA-1 name of the most
1053recent commit (or "head") of a branch under development.  SHA-1 names of
1054tags of interest are stored under `ref/tags/`.  A special ref named
1055`HEAD` contains the name of the currently checked-out branch.
1056
1057The index file is initialized with a list of all paths and, for each
1058path, a blob object and a set of attributes.  The blob object represents
1059the contents of the file as of the head of the current branch.  The
1060attributes (last modified time, size, etc.) are taken from the
1061corresponding file in the working tree.  Subsequent changes to the
1062working tree can be found by comparing these attributes.  The index may
1063be updated with new content, and new commits may be created from the
1064content stored in the index.
1065
1066The index is also capable of storing multiple entries (called "stages")
1067for a given pathname.  These stages are used to hold the various
1068unmerged version of a file when a merge is in progress.
1069
1070FURTHER DOCUMENTATION
1071---------------------
1072
1073See the references in the "description" section to get started
1074using Git.  The following is probably more detail than necessary
1075for a first-time user.
1076
1077The link:user-manual.html#git-concepts[Git concepts chapter of the
1078user-manual] and linkgit:gitcore-tutorial[7] both provide
1079introductions to the underlying Git architecture.
1080
1081See linkgit:gitworkflows[7] for an overview of recommended workflows.
1082
1083See also the link:howto-index.html[howto] documents for some useful
1084examples.
1085
1086The internals are documented in the
1087link:technical/api-index.html[Git API documentation].
1088
1089Users migrating from CVS may also want to
1090read linkgit:gitcvs-migration[7].
1091
1092
1093Authors
1094-------
1095Git was started by Linus Torvalds, and is currently maintained by Junio
1096C Hamano. Numerous contributions have come from the Git mailing list
1097<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1098gives you a more complete list of contributors.
1099
1100If you have a clone of git.git itself, the
1101output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1102the authors for specific parts of the project.
1103
1104Reporting Bugs
1105--------------
1106
1107Report bugs to the Git mailing list <git@vger.kernel.org> where the
1108development and maintenance is primarily done.  You do not have to be
1109subscribed to the list to send a message there.
1110
1111SEE ALSO
1112--------
1113linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1114linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1115linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1116linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1117linkgit:gitworkflows[7]
1118
1119GIT
1120---
1121Part of the linkgit:git[1] suite