Documentation / git.txton commit Merge branch 'ak/use-hashmap-iter-first-in-submodule-config' (73385f2)
   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:v2.8.1/git.html[documentation for release 2.8.1]
  47
  48* release notes for
  49  link:RelNotes/2.8.1.txt[2.8.1].
  50  link:RelNotes/2.8.0.txt[2.8].
  51
  52* link:v2.7.3/git.html[documentation for release 2.7.3]
  53
  54* release notes for
  55  link:RelNotes/2.7.3.txt[2.7.3],
  56  link:RelNotes/2.7.2.txt[2.7.2],
  57  link:RelNotes/2.7.1.txt[2.7.1],
  58  link:RelNotes/2.7.0.txt[2.7].
  59
  60* link:v2.6.6/git.html[documentation for release 2.6.6]
  61
  62* release notes for
  63  link:RelNotes/2.6.6.txt[2.6.6],
  64  link:RelNotes/2.6.5.txt[2.6.5],
  65  link:RelNotes/2.6.4.txt[2.6.4],
  66  link:RelNotes/2.6.3.txt[2.6.3],
  67  link:RelNotes/2.6.2.txt[2.6.2],
  68  link:RelNotes/2.6.1.txt[2.6.1],
  69  link:RelNotes/2.6.0.txt[2.6].
  70
  71* link:v2.5.5/git.html[documentation for release 2.5.5]
  72
  73* release notes for
  74  link:RelNotes/2.5.5.txt[2.5.5],
  75  link:RelNotes/2.5.4.txt[2.5.4],
  76  link:RelNotes/2.5.3.txt[2.5.3],
  77  link:RelNotes/2.5.2.txt[2.5.2],
  78  link:RelNotes/2.5.1.txt[2.5.1],
  79  link:RelNotes/2.5.0.txt[2.5].
  80
  81* link:v2.4.11/git.html[documentation for release 2.4.11]
  82
  83* release notes for
  84  link:RelNotes/2.4.11.txt[2.4.11],
  85  link:RelNotes/2.4.10.txt[2.4.10],
  86  link:RelNotes/2.4.9.txt[2.4.9],
  87  link:RelNotes/2.4.8.txt[2.4.8],
  88  link:RelNotes/2.4.7.txt[2.4.7],
  89  link:RelNotes/2.4.6.txt[2.4.6],
  90  link:RelNotes/2.4.5.txt[2.4.5],
  91  link:RelNotes/2.4.4.txt[2.4.4],
  92  link:RelNotes/2.4.3.txt[2.4.3],
  93  link:RelNotes/2.4.2.txt[2.4.2],
  94  link:RelNotes/2.4.1.txt[2.4.1],
  95  link:RelNotes/2.4.0.txt[2.4].
  96
  97* link:v2.3.10/git.html[documentation for release 2.3.10]
  98
  99* release notes for
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 101  link:RelNotes/2.3.9.txt[2.3.9],
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 112* link:v2.2.3/git.html[documentation for release 2.2.3]
 113
 114* release notes for
 115  link:RelNotes/2.2.3.txt[2.2.3],
 116  link:RelNotes/2.2.2.txt[2.2.2],
 117  link:RelNotes/2.2.1.txt[2.2.1],
 118  link:RelNotes/2.2.0.txt[2.2].
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 120* link:v2.1.4/git.html[documentation for release 2.1.4]
 121
 122* release notes for
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 129* link:v2.0.5/git.html[documentation for release 2.0.5]
 130
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 137  link:RelNotes/2.0.0.txt[2.0.0].
 138
 139* link:v1.9.5/git.html[documentation for release 1.9.5]
 140
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 428  link:RelNotes/1.5.5.5.txt[1.5.5.5],
 429  link:RelNotes/1.5.5.4.txt[1.5.5.4],
 430  link:RelNotes/1.5.5.3.txt[1.5.5.3],
 431  link:RelNotes/1.5.5.2.txt[1.5.5.2],
 432  link:RelNotes/1.5.5.1.txt[1.5.5.1],
 433  link:RelNotes/1.5.5.txt[1.5.5].
 434
 435* link:v1.5.4.7/git.html[documentation for release 1.5.4.7]
 436
 437* release notes for
 438  link:RelNotes/1.5.4.7.txt[1.5.4.7],
 439  link:RelNotes/1.5.4.6.txt[1.5.4.6],
 440  link:RelNotes/1.5.4.5.txt[1.5.4.5],
 441  link:RelNotes/1.5.4.4.txt[1.5.4.4],
 442  link:RelNotes/1.5.4.3.txt[1.5.4.3],
 443  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 444  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 445  link:RelNotes/1.5.4.txt[1.5.4].
 446
 447* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 448
 449* release notes for
 450  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 451  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 452  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 453  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 454  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 455  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 456  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 457  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 458  link:RelNotes/1.5.3.txt[1.5.3].
 459
 460* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 461
 462* release notes for
 463  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 464  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 465  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 466  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 467  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 468  link:RelNotes/1.5.2.txt[1.5.2].
 469
 470* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 471
 472* release notes for
 473  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 474  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 475  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 476  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 477  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 478  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 479  link:RelNotes/1.5.1.txt[1.5.1].
 480
 481* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 482
 483* release notes for
 484  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 485  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 486  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 487  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 488  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 489  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 490  link:RelNotes/1.5.0.txt[1.5.0].
 491
 492* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 493  link:v1.3.3/git.html[1.3.3],
 494  link:v1.2.6/git.html[1.2.6],
 495  link:v1.0.13/git.html[1.0.13].
 496
 497============
 498
 499endif::stalenotes[]
 500
 501OPTIONS
 502-------
 503--version::
 504        Prints the Git suite version that the 'git' program came from.
 505
 506--help::
 507        Prints the synopsis and a list of the most commonly used
 508        commands. If the option '--all' or '-a' is given then all
 509        available commands are printed. If a Git command is named this
 510        option will bring up the manual page for that command.
 511+
 512Other options are available to control how the manual page is
 513displayed. See linkgit:git-help[1] for more information,
 514because `git --help ...` is converted internally into `git
 515help ...`.
 516
 517-C <path>::
 518        Run as if git was started in '<path>' instead of the current working
 519        directory.  When multiple `-C` options are given, each subsequent
 520        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 521        <path>`.
 522+
 523This option affects options that expect path name like `--git-dir` and
 524`--work-tree` in that their interpretations of the path names would be
 525made relative to the working directory caused by the `-C` option. For
 526example the following invocations are equivalent:
 527
 528    git --git-dir=a.git --work-tree=b -C c status
 529    git --git-dir=c/a.git --work-tree=c/b status
 530
 531-c <name>=<value>::
 532        Pass a configuration parameter to the command. The value
 533        given will override values from configuration files.
 534        The <name> is expected in the same format as listed by
 535        'git config' (subkeys separated by dots).
 536+
 537Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 538`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 539config file). Including the equals but with an empty value (like `git -c
 540foo.bar= ...`) sets `foo.bar` to the empty string.
 541
 542--exec-path[=<path>]::
 543        Path to wherever your core Git programs are installed.
 544        This can also be controlled by setting the GIT_EXEC_PATH
 545        environment variable. If no path is given, 'git' will print
 546        the current setting and then exit.
 547
 548--html-path::
 549        Print the path, without trailing slash, where Git's HTML
 550        documentation is installed and exit.
 551
 552--man-path::
 553        Print the manpath (see `man(1)`) for the man pages for
 554        this version of Git and exit.
 555
 556--info-path::
 557        Print the path where the Info files documenting this
 558        version of Git are installed and exit.
 559
 560-p::
 561--paginate::
 562        Pipe all output into 'less' (or if set, $PAGER) if standard
 563        output is a terminal.  This overrides the `pager.<cmd>`
 564        configuration options (see the "Configuration Mechanism" section
 565        below).
 566
 567--no-pager::
 568        Do not pipe Git output into a pager.
 569
 570--git-dir=<path>::
 571        Set the path to the repository. This can also be controlled by
 572        setting the GIT_DIR environment variable. It can be an absolute
 573        path or relative path to current working directory.
 574
 575--work-tree=<path>::
 576        Set the path to the working tree. It can be an absolute path
 577        or a path relative to the current working directory.
 578        This can also be controlled by setting the GIT_WORK_TREE
 579        environment variable and the core.worktree configuration
 580        variable (see core.worktree in linkgit:git-config[1] for a
 581        more detailed discussion).
 582
 583--namespace=<path>::
 584        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 585        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 586        variable.
 587
 588--bare::
 589        Treat the repository as a bare repository.  If GIT_DIR
 590        environment is not set, it is set to the current working
 591        directory.
 592
 593--no-replace-objects::
 594        Do not use replacement refs to replace Git objects. See
 595        linkgit:git-replace[1] for more information.
 596
 597--literal-pathspecs::
 598        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 599        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 600        variable to `1`.
 601
 602--glob-pathspecs::
 603        Add "glob" magic to all pathspec. This is equivalent to setting
 604        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 605        globbing on individual pathspecs can be done using pathspec
 606        magic ":(literal)"
 607
 608--noglob-pathspecs::
 609        Add "literal" magic to all pathspec. This is equivalent to setting
 610        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 611        globbing on individual pathspecs can be done using pathspec
 612        magic ":(glob)"
 613
 614--icase-pathspecs::
 615        Add "icase" magic to all pathspec. This is equivalent to setting
 616        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 617
 618GIT COMMANDS
 619------------
 620
 621We divide Git into high level ("porcelain") commands and low level
 622("plumbing") commands.
 623
 624High-level commands (porcelain)
 625-------------------------------
 626
 627We separate the porcelain commands into the main commands and some
 628ancillary user utilities.
 629
 630Main porcelain commands
 631~~~~~~~~~~~~~~~~~~~~~~~
 632
 633include::cmds-mainporcelain.txt[]
 634
 635Ancillary Commands
 636~~~~~~~~~~~~~~~~~~
 637Manipulators:
 638
 639include::cmds-ancillarymanipulators.txt[]
 640
 641Interrogators:
 642
 643include::cmds-ancillaryinterrogators.txt[]
 644
 645
 646Interacting with Others
 647~~~~~~~~~~~~~~~~~~~~~~~
 648
 649These commands are to interact with foreign SCM and with other
 650people via patch over e-mail.
 651
 652include::cmds-foreignscminterface.txt[]
 653
 654
 655Low-level commands (plumbing)
 656-----------------------------
 657
 658Although Git includes its
 659own porcelain layer, its low-level commands are sufficient to support
 660development of alternative porcelains.  Developers of such porcelains
 661might start by reading about linkgit:git-update-index[1] and
 662linkgit:git-read-tree[1].
 663
 664The interface (input, output, set of options and the semantics)
 665to these low-level commands are meant to be a lot more stable
 666than Porcelain level commands, because these commands are
 667primarily for scripted use.  The interface to Porcelain commands
 668on the other hand are subject to change in order to improve the
 669end user experience.
 670
 671The following description divides
 672the low-level commands into commands that manipulate objects (in
 673the repository, index, and working tree), commands that interrogate and
 674compare objects, and commands that move objects and references between
 675repositories.
 676
 677
 678Manipulation commands
 679~~~~~~~~~~~~~~~~~~~~~
 680
 681include::cmds-plumbingmanipulators.txt[]
 682
 683
 684Interrogation commands
 685~~~~~~~~~~~~~~~~~~~~~~
 686
 687include::cmds-plumbinginterrogators.txt[]
 688
 689In general, the interrogate commands do not touch the files in
 690the working tree.
 691
 692
 693Synching repositories
 694~~~~~~~~~~~~~~~~~~~~~
 695
 696include::cmds-synchingrepositories.txt[]
 697
 698The following are helper commands used by the above; end users
 699typically do not use them directly.
 700
 701include::cmds-synchelpers.txt[]
 702
 703
 704Internal helper commands
 705~~~~~~~~~~~~~~~~~~~~~~~~
 706
 707These are internal helper commands used by other commands; end
 708users typically do not use them directly.
 709
 710include::cmds-purehelpers.txt[]
 711
 712
 713Configuration Mechanism
 714-----------------------
 715
 716Git uses a simple text format to store customizations that are per
 717repository and are per user.  Such a configuration file may look
 718like this:
 719
 720------------
 721#
 722# A '#' or ';' character indicates a comment.
 723#
 724
 725; core variables
 726[core]
 727        ; Don't trust file modes
 728        filemode = false
 729
 730; user identity
 731[user]
 732        name = "Junio C Hamano"
 733        email = "gitster@pobox.com"
 734
 735------------
 736
 737Various commands read from the configuration file and adjust
 738their operation accordingly.  See linkgit:git-config[1] for a
 739list and more details about the configuration mechanism.
 740
 741
 742Identifier Terminology
 743----------------------
 744<object>::
 745        Indicates the object name for any type of object.
 746
 747<blob>::
 748        Indicates a blob object name.
 749
 750<tree>::
 751        Indicates a tree object name.
 752
 753<commit>::
 754        Indicates a commit object name.
 755
 756<tree-ish>::
 757        Indicates a tree, commit or tag object name.  A
 758        command that takes a <tree-ish> argument ultimately wants to
 759        operate on a <tree> object but automatically dereferences
 760        <commit> and <tag> objects that point at a <tree>.
 761
 762<commit-ish>::
 763        Indicates a commit or tag object name.  A
 764        command that takes a <commit-ish> argument ultimately wants to
 765        operate on a <commit> object but automatically dereferences
 766        <tag> objects that point at a <commit>.
 767
 768<type>::
 769        Indicates that an object type is required.
 770        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 771
 772<file>::
 773        Indicates a filename - almost always relative to the
 774        root of the tree structure `GIT_INDEX_FILE` describes.
 775
 776Symbolic Identifiers
 777--------------------
 778Any Git command accepting any <object> can also use the following
 779symbolic notation:
 780
 781HEAD::
 782        indicates the head of the current branch.
 783
 784<tag>::
 785        a valid tag 'name'
 786        (i.e. a `refs/tags/<tag>` reference).
 787
 788<head>::
 789        a valid head 'name'
 790        (i.e. a `refs/heads/<head>` reference).
 791
 792For a more complete list of ways to spell object names, see
 793"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 794
 795
 796File/Directory Structure
 797------------------------
 798
 799Please see the linkgit:gitrepository-layout[5] document.
 800
 801Read linkgit:githooks[5] for more details about each hook.
 802
 803Higher level SCMs may provide and manage additional information in the
 804`$GIT_DIR`.
 805
 806
 807Terminology
 808-----------
 809Please see linkgit:gitglossary[7].
 810
 811
 812Environment Variables
 813---------------------
 814Various Git commands use the following environment variables:
 815
 816The Git Repository
 817~~~~~~~~~~~~~~~~~~
 818These environment variables apply to 'all' core Git commands. Nb: it
 819is worth noting that they may be used/overridden by SCMS sitting above
 820Git so take care if using a foreign front-end.
 821
 822'GIT_INDEX_FILE'::
 823        This environment allows the specification of an alternate
 824        index file. If not specified, the default of `$GIT_DIR/index`
 825        is used.
 826
 827'GIT_INDEX_VERSION'::
 828        This environment variable allows the specification of an index
 829        version for new repositories.  It won't affect existing index
 830        files.  By default index file version 2 or 3 is used. See
 831        linkgit:git-update-index[1] for more information.
 832
 833'GIT_OBJECT_DIRECTORY'::
 834        If the object storage directory is specified via this
 835        environment variable then the sha1 directories are created
 836        underneath - otherwise the default `$GIT_DIR/objects`
 837        directory is used.
 838
 839'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
 840        Due to the immutable nature of Git objects, old objects can be
 841        archived into shared, read-only directories. This variable
 842        specifies a ":" separated (on Windows ";" separated) list
 843        of Git object directories which can be used to search for Git
 844        objects. New objects will not be written to these directories.
 845
 846'GIT_DIR'::
 847        If the 'GIT_DIR' environment variable is set then it
 848        specifies a path to use instead of the default `.git`
 849        for the base of the repository.
 850        The '--git-dir' command-line option also sets this value.
 851
 852'GIT_WORK_TREE'::
 853        Set the path to the root of the working tree.
 854        This can also be controlled by the '--work-tree' command-line
 855        option and the core.worktree configuration variable.
 856
 857'GIT_NAMESPACE'::
 858        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 859        The '--namespace' command-line option also sets this value.
 860
 861'GIT_CEILING_DIRECTORIES'::
 862        This should be a colon-separated list of absolute paths.  If
 863        set, it is a list of directories that Git should not chdir up
 864        into while looking for a repository directory (useful for
 865        excluding slow-loading network directories).  It will not
 866        exclude the current working directory or a GIT_DIR set on the
 867        command line or in the environment.  Normally, Git has to read
 868        the entries in this list and resolve any symlink that
 869        might be present in order to compare them with the current
 870        directory.  However, if even this access is slow, you
 871        can add an empty entry to the list to tell Git that the
 872        subsequent entries are not symlinks and needn't be resolved;
 873        e.g.,
 874        'GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink'.
 875
 876'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
 877        When run in a directory that does not have ".git" repository
 878        directory, Git tries to find such a directory in the parent
 879        directories to find the top of the working tree, but by default it
 880        does not cross filesystem boundaries.  This environment variable
 881        can be set to true to tell Git not to stop at filesystem
 882        boundaries.  Like 'GIT_CEILING_DIRECTORIES', this will not affect
 883        an explicit repository directory set via 'GIT_DIR' or on the
 884        command line.
 885
 886'GIT_COMMON_DIR'::
 887        If this variable is set to a path, non-worktree files that are
 888        normally in $GIT_DIR will be taken from this path
 889        instead. Worktree-specific files such as HEAD or index are
 890        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 891        linkgit:git-worktree[1] for
 892        details. This variable has lower precedence than other path
 893        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 894
 895Git Commits
 896~~~~~~~~~~~
 897'GIT_AUTHOR_NAME'::
 898'GIT_AUTHOR_EMAIL'::
 899'GIT_AUTHOR_DATE'::
 900'GIT_COMMITTER_NAME'::
 901'GIT_COMMITTER_EMAIL'::
 902'GIT_COMMITTER_DATE'::
 903'EMAIL'::
 904        see linkgit:git-commit-tree[1]
 905
 906Git Diffs
 907~~~~~~~~~
 908'GIT_DIFF_OPTS'::
 909        Only valid setting is "--unified=??" or "-u??" to set the
 910        number of context lines shown when a unified diff is created.
 911        This takes precedence over any "-U" or "--unified" option
 912        value passed on the Git diff command line.
 913
 914'GIT_EXTERNAL_DIFF'::
 915        When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
 916        program named by it is called, instead of the diff invocation
 917        described above.  For a path that is added, removed, or modified,
 918        'GIT_EXTERNAL_DIFF' is called with 7 parameters:
 919
 920        path old-file old-hex old-mode new-file new-hex new-mode
 921+
 922where:
 923
 924        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 925                         contents of <old|new>,
 926        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 927        <old|new>-mode:: are the octal representation of the file modes.
 928+
 929The file parameters can point at the user's working file
 930(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 931when a new file is added), or a temporary file (e.g. `old-file` in the
 932index).  'GIT_EXTERNAL_DIFF' should not worry about unlinking the
 933temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 934+
 935For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 936parameter, <path>.
 937+
 938For each path 'GIT_EXTERNAL_DIFF' is called, two environment variables,
 939'GIT_DIFF_PATH_COUNTER' and 'GIT_DIFF_PATH_TOTAL' are set.
 940
 941'GIT_DIFF_PATH_COUNTER'::
 942        A 1-based counter incremented by one for every path.
 943
 944'GIT_DIFF_PATH_TOTAL'::
 945        The total number of paths.
 946
 947other
 948~~~~~
 949'GIT_MERGE_VERBOSITY'::
 950        A number controlling the amount of output shown by
 951        the recursive merge strategy.  Overrides merge.verbosity.
 952        See linkgit:git-merge[1]
 953
 954'GIT_PAGER'::
 955        This environment variable overrides `$PAGER`. If it is set
 956        to an empty string or to the value "cat", Git will not launch
 957        a pager.  See also the `core.pager` option in
 958        linkgit:git-config[1].
 959
 960'GIT_EDITOR'::
 961        This environment variable overrides `$EDITOR` and `$VISUAL`.
 962        It is used by several Git commands when, on interactive mode,
 963        an editor is to be launched. See also linkgit:git-var[1]
 964        and the `core.editor` option in linkgit:git-config[1].
 965
 966'GIT_SSH'::
 967'GIT_SSH_COMMAND'::
 968        If either of these environment variables is set then 'git fetch'
 969        and 'git push' will use the specified command instead of 'ssh'
 970        when they need to connect to a remote system.
 971        The command will be given exactly two or four arguments: the
 972        'username@host' (or just 'host') from the URL and the shell
 973        command to execute on that remote system, optionally preceded by
 974        '-p' (literally) and the 'port' from the URL when it specifies
 975        something other than the default SSH port.
 976+
 977`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 978by the shell, which allows additional arguments to be included.
 979`$GIT_SSH` on the other hand must be just the path to a program
 980(which can be a wrapper shell script, if additional arguments are
 981needed).
 982+
 983Usually it is easier to configure any desired options through your
 984personal `.ssh/config` file.  Please consult your ssh documentation
 985for further details.
 986
 987'GIT_ASKPASS'::
 988        If this environment variable is set, then Git commands which need to
 989        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
 990        will call this program with a suitable prompt as command-line argument
 991        and read the password from its STDOUT. See also the 'core.askPass'
 992        option in linkgit:git-config[1].
 993
 994'GIT_TERMINAL_PROMPT'::
 995        If this environment variable is set to `0`, git will not prompt
 996        on the terminal (e.g., when asking for HTTP authentication).
 997
 998'GIT_CONFIG_NOSYSTEM'::
 999        Whether to skip reading settings from the system-wide
1000        `$(prefix)/etc/gitconfig` file.  This environment variable can
1001        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
1002        predictable environment for a picky script, or you can set it
1003        temporarily to avoid using a buggy `/etc/gitconfig` file while
1004        waiting for someone with sufficient permissions to fix it.
1005
1006'GIT_FLUSH'::
1007        If this environment variable is set to "1", then commands such
1008        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
1009        'git check-attr' and 'git check-ignore' will
1010        force a flush of the output stream after each record have been
1011        flushed. If this
1012        variable is set to "0", the output of these commands will be done
1013        using completely buffered I/O.   If this environment variable is
1014        not set, Git will choose buffered or record-oriented flushing
1015        based on whether stdout appears to be redirected to a file or not.
1016
1017'GIT_TRACE'::
1018        Enables general trace messages, e.g. alias expansion, built-in
1019        command execution and external command execution.
1020+
1021If this variable is set to "1", "2" or "true" (comparison
1022is case insensitive), trace messages will be printed to
1023stderr.
1024+
1025If the variable is set to an integer value greater than 2
1026and lower than 10 (strictly) then Git will interpret this
1027value as an open file descriptor and will try to write the
1028trace messages into this file descriptor.
1029+
1030Alternatively, if the variable is set to an absolute path
1031(starting with a '/' character), Git will interpret this
1032as a file path and will try to write the trace messages
1033into it.
1034+
1035Unsetting the variable, or setting it to empty, "0" or
1036"false" (case insensitive) disables trace messages.
1037
1038'GIT_TRACE_PACK_ACCESS'::
1039        Enables trace messages for all accesses to any packs. For each
1040        access, the pack file name and an offset in the pack is
1041        recorded. This may be helpful for troubleshooting some
1042        pack-related performance problems.
1043        See 'GIT_TRACE' for available trace output options.
1044
1045'GIT_TRACE_PACKET'::
1046        Enables trace messages for all packets coming in or out of a
1047        given program. This can help with debugging object negotiation
1048        or other protocol issues. Tracing is turned off at a packet
1049        starting with "PACK" (but see 'GIT_TRACE_PACKFILE' below).
1050        See 'GIT_TRACE' for available trace output options.
1051
1052'GIT_TRACE_PACKFILE'::
1053        Enables tracing of packfiles sent or received by a
1054        given program. Unlike other trace output, this trace is
1055        verbatim: no headers, and no quoting of binary data. You almost
1056        certainly want to direct into a file (e.g.,
1057        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1058        the terminal or mixing it with other trace output.
1059+
1060Note that this is currently only implemented for the client side
1061of clones and fetches.
1062
1063'GIT_TRACE_PERFORMANCE'::
1064        Enables performance related trace messages, e.g. total execution
1065        time of each Git command.
1066        See 'GIT_TRACE' for available trace output options.
1067
1068'GIT_TRACE_SETUP'::
1069        Enables trace messages printing the .git, working tree and current
1070        working directory after Git has completed its setup phase.
1071        See 'GIT_TRACE' for available trace output options.
1072
1073'GIT_TRACE_SHALLOW'::
1074        Enables trace messages that can help debugging fetching /
1075        cloning of shallow repositories.
1076        See 'GIT_TRACE' for available trace output options.
1077
1078'GIT_LITERAL_PATHSPECS'::
1079        Setting this variable to `1` will cause Git to treat all
1080        pathspecs literally, rather than as glob patterns. For example,
1081        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1082        for commits that touch the path `*.c`, not any paths that the
1083        glob `*.c` matches. You might want this if you are feeding
1084        literal paths to Git (e.g., paths previously given to you by
1085        `git ls-tree`, `--raw` diff output, etc).
1086
1087'GIT_GLOB_PATHSPECS'::
1088        Setting this variable to `1` will cause Git to treat all
1089        pathspecs as glob patterns (aka "glob" magic).
1090
1091'GIT_NOGLOB_PATHSPECS'::
1092        Setting this variable to `1` will cause Git to treat all
1093        pathspecs as literal (aka "literal" magic).
1094
1095'GIT_ICASE_PATHSPECS'::
1096        Setting this variable to `1` will cause Git to treat all
1097        pathspecs as case-insensitive.
1098
1099'GIT_REFLOG_ACTION'::
1100        When a ref is updated, reflog entries are created to keep
1101        track of the reason why the ref was updated (which is
1102        typically the name of the high-level command that updated
1103        the ref), in addition to the old and new values of the ref.
1104        A scripted Porcelain command can use set_reflog_action
1105        helper function in `git-sh-setup` to set its name to this
1106        variable when it is invoked as the top level command by the
1107        end user, to be recorded in the body of the reflog.
1108
1109'GIT_REF_PARANOIA'::
1110        If set to `1`, include broken or badly named refs when iterating
1111        over lists of refs. In a normal, non-corrupted repository, this
1112        does nothing. However, enabling it may help git to detect and
1113        abort some operations in the presence of broken refs. Git sets
1114        this variable automatically when performing destructive
1115        operations like linkgit:git-prune[1]. You should not need to set
1116        it yourself unless you want to be paranoid about making sure
1117        an operation has touched every ref (e.g., because you are
1118        cloning a repository to make a backup).
1119
1120'GIT_ALLOW_PROTOCOL'::
1121        If set, provide a colon-separated list of protocols which are
1122        allowed to be used with fetch/push/clone. This is useful to
1123        restrict recursive submodule initialization from an untrusted
1124        repository. Any protocol not mentioned will be disallowed (i.e.,
1125        this is a whitelist, not a blacklist). If the variable is not
1126        set at all, all protocols are enabled.  The protocol names
1127        currently used by git are:
1128
1129          - `file`: any local file-based path (including `file://` URLs,
1130            or local paths)
1131
1132          - `git`: the anonymous git protocol over a direct TCP
1133            connection (or proxy, if configured)
1134
1135          - `ssh`: git over ssh (including `host:path` syntax,
1136            `ssh://`, etc).
1137
1138          - `http`: git over http, both "smart http" and "dumb http".
1139            Note that this does _not_ include `https`; if you want both,
1140            you should specify both as `http:https`.
1141
1142          - any external helpers are named by their protocol (e.g., use
1143            `hg` to allow the `git-remote-hg` helper)
1144
1145
1146Discussion[[Discussion]]
1147------------------------
1148
1149More detail on the following is available from the
1150link:user-manual.html#git-concepts[Git concepts chapter of the
1151user-manual] and linkgit:gitcore-tutorial[7].
1152
1153A Git project normally consists of a working directory with a ".git"
1154subdirectory at the top level.  The .git directory contains, among other
1155things, a compressed object database representing the complete history
1156of the project, an "index" file which links that history to the current
1157contents of the working tree, and named pointers into that history such
1158as tags and branch heads.
1159
1160The object database contains objects of three main types: blobs, which
1161hold file data; trees, which point to blobs and other trees to build up
1162directory hierarchies; and commits, which each reference a single tree
1163and some number of parent commits.
1164
1165The commit, equivalent to what other systems call a "changeset" or
1166"version", represents a step in the project's history, and each parent
1167represents an immediately preceding step.  Commits with more than one
1168parent represent merges of independent lines of development.
1169
1170All objects are named by the SHA-1 hash of their contents, normally
1171written as a string of 40 hex digits.  Such names are globally unique.
1172The entire history leading up to a commit can be vouched for by signing
1173just that commit.  A fourth object type, the tag, is provided for this
1174purpose.
1175
1176When first created, objects are stored in individual files, but for
1177efficiency may later be compressed together into "pack files".
1178
1179Named pointers called refs mark interesting points in history.  A ref
1180may contain the SHA-1 name of an object or the name of another ref.  Refs
1181with names beginning `ref/head/` contain the SHA-1 name of the most
1182recent commit (or "head") of a branch under development.  SHA-1 names of
1183tags of interest are stored under `ref/tags/`.  A special ref named
1184`HEAD` contains the name of the currently checked-out branch.
1185
1186The index file is initialized with a list of all paths and, for each
1187path, a blob object and a set of attributes.  The blob object represents
1188the contents of the file as of the head of the current branch.  The
1189attributes (last modified time, size, etc.) are taken from the
1190corresponding file in the working tree.  Subsequent changes to the
1191working tree can be found by comparing these attributes.  The index may
1192be updated with new content, and new commits may be created from the
1193content stored in the index.
1194
1195The index is also capable of storing multiple entries (called "stages")
1196for a given pathname.  These stages are used to hold the various
1197unmerged version of a file when a merge is in progress.
1198
1199FURTHER DOCUMENTATION
1200---------------------
1201
1202See the references in the "description" section to get started
1203using Git.  The following is probably more detail than necessary
1204for a first-time user.
1205
1206The link:user-manual.html#git-concepts[Git concepts chapter of the
1207user-manual] and linkgit:gitcore-tutorial[7] both provide
1208introductions to the underlying Git architecture.
1209
1210See linkgit:gitworkflows[7] for an overview of recommended workflows.
1211
1212See also the link:howto-index.html[howto] documents for some useful
1213examples.
1214
1215The internals are documented in the
1216link:technical/api-index.html[Git API documentation].
1217
1218Users migrating from CVS may also want to
1219read linkgit:gitcvs-migration[7].
1220
1221
1222Authors
1223-------
1224Git was started by Linus Torvalds, and is currently maintained by Junio
1225C Hamano. Numerous contributions have come from the Git mailing list
1226<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1227gives you a more complete list of contributors.
1228
1229If you have a clone of git.git itself, the
1230output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1231the authors for specific parts of the project.
1232
1233Reporting Bugs
1234--------------
1235
1236Report bugs to the Git mailing list <git@vger.kernel.org> where the
1237development and maintenance is primarily done.  You do not have to be
1238subscribed to the list to send a message there.
1239
1240SEE ALSO
1241--------
1242linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1243linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1244linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1245linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1246linkgit:gitworkflows[7]
1247
1248GIT
1249---
1250Part of the linkgit:git[1] suite