Documentation / git.txton commit Sync with maint (ee88674)
   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:v2.8.2/git.html[documentation for release 2.8.2]
  47
  48* release notes for
  49  link:RelNotes/2.8.2.txt[2.8.2].
  50  link:RelNotes/2.8.1.txt[2.8.1].
  51  link:RelNotes/2.8.0.txt[2.8].
  52
  53* link:v2.7.3/git.html[documentation for release 2.7.3]
  54
  55* release notes for
  56  link:RelNotes/2.7.3.txt[2.7.3],
  57  link:RelNotes/2.7.2.txt[2.7.2],
  58  link:RelNotes/2.7.1.txt[2.7.1],
  59  link:RelNotes/2.7.0.txt[2.7].
  60
  61* link:v2.6.6/git.html[documentation for release 2.6.6]
  62
  63* release notes for
  64  link:RelNotes/2.6.6.txt[2.6.6],
  65  link:RelNotes/2.6.5.txt[2.6.5],
  66  link:RelNotes/2.6.4.txt[2.6.4],
  67  link:RelNotes/2.6.3.txt[2.6.3],
  68  link:RelNotes/2.6.2.txt[2.6.2],
  69  link:RelNotes/2.6.1.txt[2.6.1],
  70  link:RelNotes/2.6.0.txt[2.6].
  71
  72* link:v2.5.5/git.html[documentation for release 2.5.5]
  73
  74* release notes for
  75  link:RelNotes/2.5.5.txt[2.5.5],
  76  link:RelNotes/2.5.4.txt[2.5.4],
  77  link:RelNotes/2.5.3.txt[2.5.3],
  78  link:RelNotes/2.5.2.txt[2.5.2],
  79  link:RelNotes/2.5.1.txt[2.5.1],
  80  link:RelNotes/2.5.0.txt[2.5].
  81
  82* link:v2.4.11/git.html[documentation for release 2.4.11]
  83
  84* release notes for
  85  link:RelNotes/2.4.11.txt[2.4.11],
  86  link:RelNotes/2.4.10.txt[2.4.10],
  87  link:RelNotes/2.4.9.txt[2.4.9],
  88  link:RelNotes/2.4.8.txt[2.4.8],
  89  link:RelNotes/2.4.7.txt[2.4.7],
  90  link:RelNotes/2.4.6.txt[2.4.6],
  91  link:RelNotes/2.4.5.txt[2.4.5],
  92  link:RelNotes/2.4.4.txt[2.4.4],
  93  link:RelNotes/2.4.3.txt[2.4.3],
  94  link:RelNotes/2.4.2.txt[2.4.2],
  95  link:RelNotes/2.4.1.txt[2.4.1],
  96  link:RelNotes/2.4.0.txt[2.4].
  97
  98* link:v2.3.10/git.html[documentation for release 2.3.10]
  99
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 102  link:RelNotes/2.3.9.txt[2.3.9],
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 111  link:RelNotes/2.3.0.txt[2.3].
 112
 113* link:v2.2.3/git.html[documentation for release 2.2.3]
 114
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 116  link:RelNotes/2.2.3.txt[2.2.3],
 117  link:RelNotes/2.2.2.txt[2.2.2],
 118  link:RelNotes/2.2.1.txt[2.2.1],
 119  link:RelNotes/2.2.0.txt[2.2].
 120
 121* link:v2.1.4/git.html[documentation for release 2.1.4]
 122
 123* release notes for
 124  link:RelNotes/2.1.4.txt[2.1.4],
 125  link:RelNotes/2.1.3.txt[2.1.3],
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 128  link:RelNotes/2.1.0.txt[2.1].
 129
 130* link:v2.0.5/git.html[documentation for release 2.0.5]
 131
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 137  link:RelNotes/2.0.1.txt[2.0.1],
 138  link:RelNotes/2.0.0.txt[2.0.0].
 139
 140* link:v1.9.5/git.html[documentation for release 1.9.5]
 141
 142* release notes for
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 148  link:RelNotes/1.9.0.txt[1.9.0].
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 150* link:v1.8.5.6/git.html[documentation for release 1.8.5.6]
 151
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 160
 161* link:v1.8.4.5/git.html[documentation for release 1.8.4.5]
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 163* release notes for
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 188* link:v1.8.1.6/git.html[documentation for release 1.8.1.6]
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 238* link:v1.7.9.7/git.html[documentation for release 1.7.9.7]
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 250* link:v1.7.8.6/git.html[documentation for release 1.7.8.6]
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 429  link:RelNotes/1.5.5.5.txt[1.5.5.5],
 430  link:RelNotes/1.5.5.4.txt[1.5.5.4],
 431  link:RelNotes/1.5.5.3.txt[1.5.5.3],
 432  link:RelNotes/1.5.5.2.txt[1.5.5.2],
 433  link:RelNotes/1.5.5.1.txt[1.5.5.1],
 434  link:RelNotes/1.5.5.txt[1.5.5].
 435
 436* link:v1.5.4.7/git.html[documentation for release 1.5.4.7]
 437
 438* release notes for
 439  link:RelNotes/1.5.4.7.txt[1.5.4.7],
 440  link:RelNotes/1.5.4.6.txt[1.5.4.6],
 441  link:RelNotes/1.5.4.5.txt[1.5.4.5],
 442  link:RelNotes/1.5.4.4.txt[1.5.4.4],
 443  link:RelNotes/1.5.4.3.txt[1.5.4.3],
 444  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 445  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 446  link:RelNotes/1.5.4.txt[1.5.4].
 447
 448* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 449
 450* release notes for
 451  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 452  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 453  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 454  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 455  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 456  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 457  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 458  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 459  link:RelNotes/1.5.3.txt[1.5.3].
 460
 461* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 462
 463* release notes for
 464  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 465  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 466  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 467  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 468  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 469  link:RelNotes/1.5.2.txt[1.5.2].
 470
 471* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 472
 473* release notes for
 474  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 475  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 476  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 477  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 478  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 479  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 480  link:RelNotes/1.5.1.txt[1.5.1].
 481
 482* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 483
 484* release notes for
 485  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 486  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 487  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 488  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 489  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 490  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 491  link:RelNotes/1.5.0.txt[1.5.0].
 492
 493* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 494  link:v1.3.3/git.html[1.3.3],
 495  link:v1.2.6/git.html[1.2.6],
 496  link:v1.0.13/git.html[1.0.13].
 497
 498============
 499
 500endif::stalenotes[]
 501
 502OPTIONS
 503-------
 504--version::
 505        Prints the Git suite version that the 'git' program came from.
 506
 507--help::
 508        Prints the synopsis and a list of the most commonly used
 509        commands. If the option '--all' or '-a' is given then all
 510        available commands are printed. If a Git command is named this
 511        option will bring up the manual page for that command.
 512+
 513Other options are available to control how the manual page is
 514displayed. See linkgit:git-help[1] for more information,
 515because `git --help ...` is converted internally into `git
 516help ...`.
 517
 518-C <path>::
 519        Run as if git was started in '<path>' instead of the current working
 520        directory.  When multiple `-C` options are given, each subsequent
 521        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 522        <path>`.
 523+
 524This option affects options that expect path name like `--git-dir` and
 525`--work-tree` in that their interpretations of the path names would be
 526made relative to the working directory caused by the `-C` option. For
 527example the following invocations are equivalent:
 528
 529    git --git-dir=a.git --work-tree=b -C c status
 530    git --git-dir=c/a.git --work-tree=c/b status
 531
 532-c <name>=<value>::
 533        Pass a configuration parameter to the command. The value
 534        given will override values from configuration files.
 535        The <name> is expected in the same format as listed by
 536        'git config' (subkeys separated by dots).
 537+
 538Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 539`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 540config file). Including the equals but with an empty value (like `git -c
 541foo.bar= ...`) sets `foo.bar` to the empty string.
 542
 543--exec-path[=<path>]::
 544        Path to wherever your core Git programs are installed.
 545        This can also be controlled by setting the GIT_EXEC_PATH
 546        environment variable. If no path is given, 'git' will print
 547        the current setting and then exit.
 548
 549--html-path::
 550        Print the path, without trailing slash, where Git's HTML
 551        documentation is installed and exit.
 552
 553--man-path::
 554        Print the manpath (see `man(1)`) for the man pages for
 555        this version of Git and exit.
 556
 557--info-path::
 558        Print the path where the Info files documenting this
 559        version of Git are installed and exit.
 560
 561-p::
 562--paginate::
 563        Pipe all output into 'less' (or if set, $PAGER) if standard
 564        output is a terminal.  This overrides the `pager.<cmd>`
 565        configuration options (see the "Configuration Mechanism" section
 566        below).
 567
 568--no-pager::
 569        Do not pipe Git output into a pager.
 570
 571--git-dir=<path>::
 572        Set the path to the repository. This can also be controlled by
 573        setting the GIT_DIR environment variable. It can be an absolute
 574        path or relative path to current working directory.
 575
 576--work-tree=<path>::
 577        Set the path to the working tree. It can be an absolute path
 578        or a path relative to the current working directory.
 579        This can also be controlled by setting the GIT_WORK_TREE
 580        environment variable and the core.worktree configuration
 581        variable (see core.worktree in linkgit:git-config[1] for a
 582        more detailed discussion).
 583
 584--namespace=<path>::
 585        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 586        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 587        variable.
 588
 589--bare::
 590        Treat the repository as a bare repository.  If GIT_DIR
 591        environment is not set, it is set to the current working
 592        directory.
 593
 594--no-replace-objects::
 595        Do not use replacement refs to replace Git objects. See
 596        linkgit:git-replace[1] for more information.
 597
 598--literal-pathspecs::
 599        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 600        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 601        variable to `1`.
 602
 603--glob-pathspecs::
 604        Add "glob" magic to all pathspec. This is equivalent to setting
 605        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 606        globbing on individual pathspecs can be done using pathspec
 607        magic ":(literal)"
 608
 609--noglob-pathspecs::
 610        Add "literal" magic to all pathspec. This is equivalent to setting
 611        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 612        globbing on individual pathspecs can be done using pathspec
 613        magic ":(glob)"
 614
 615--icase-pathspecs::
 616        Add "icase" magic to all pathspec. This is equivalent to setting
 617        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 618
 619GIT COMMANDS
 620------------
 621
 622We divide Git into high level ("porcelain") commands and low level
 623("plumbing") commands.
 624
 625High-level commands (porcelain)
 626-------------------------------
 627
 628We separate the porcelain commands into the main commands and some
 629ancillary user utilities.
 630
 631Main porcelain commands
 632~~~~~~~~~~~~~~~~~~~~~~~
 633
 634include::cmds-mainporcelain.txt[]
 635
 636Ancillary Commands
 637~~~~~~~~~~~~~~~~~~
 638Manipulators:
 639
 640include::cmds-ancillarymanipulators.txt[]
 641
 642Interrogators:
 643
 644include::cmds-ancillaryinterrogators.txt[]
 645
 646
 647Interacting with Others
 648~~~~~~~~~~~~~~~~~~~~~~~
 649
 650These commands are to interact with foreign SCM and with other
 651people via patch over e-mail.
 652
 653include::cmds-foreignscminterface.txt[]
 654
 655
 656Low-level commands (plumbing)
 657-----------------------------
 658
 659Although Git includes its
 660own porcelain layer, its low-level commands are sufficient to support
 661development of alternative porcelains.  Developers of such porcelains
 662might start by reading about linkgit:git-update-index[1] and
 663linkgit:git-read-tree[1].
 664
 665The interface (input, output, set of options and the semantics)
 666to these low-level commands are meant to be a lot more stable
 667than Porcelain level commands, because these commands are
 668primarily for scripted use.  The interface to Porcelain commands
 669on the other hand are subject to change in order to improve the
 670end user experience.
 671
 672The following description divides
 673the low-level commands into commands that manipulate objects (in
 674the repository, index, and working tree), commands that interrogate and
 675compare objects, and commands that move objects and references between
 676repositories.
 677
 678
 679Manipulation commands
 680~~~~~~~~~~~~~~~~~~~~~
 681
 682include::cmds-plumbingmanipulators.txt[]
 683
 684
 685Interrogation commands
 686~~~~~~~~~~~~~~~~~~~~~~
 687
 688include::cmds-plumbinginterrogators.txt[]
 689
 690In general, the interrogate commands do not touch the files in
 691the working tree.
 692
 693
 694Synching repositories
 695~~~~~~~~~~~~~~~~~~~~~
 696
 697include::cmds-synchingrepositories.txt[]
 698
 699The following are helper commands used by the above; end users
 700typically do not use them directly.
 701
 702include::cmds-synchelpers.txt[]
 703
 704
 705Internal helper commands
 706~~~~~~~~~~~~~~~~~~~~~~~~
 707
 708These are internal helper commands used by other commands; end
 709users typically do not use them directly.
 710
 711include::cmds-purehelpers.txt[]
 712
 713
 714Configuration Mechanism
 715-----------------------
 716
 717Git uses a simple text format to store customizations that are per
 718repository and are per user.  Such a configuration file may look
 719like this:
 720
 721------------
 722#
 723# A '#' or ';' character indicates a comment.
 724#
 725
 726; core variables
 727[core]
 728        ; Don't trust file modes
 729        filemode = false
 730
 731; user identity
 732[user]
 733        name = "Junio C Hamano"
 734        email = "gitster@pobox.com"
 735
 736------------
 737
 738Various commands read from the configuration file and adjust
 739their operation accordingly.  See linkgit:git-config[1] for a
 740list and more details about the configuration mechanism.
 741
 742
 743Identifier Terminology
 744----------------------
 745<object>::
 746        Indicates the object name for any type of object.
 747
 748<blob>::
 749        Indicates a blob object name.
 750
 751<tree>::
 752        Indicates a tree object name.
 753
 754<commit>::
 755        Indicates a commit object name.
 756
 757<tree-ish>::
 758        Indicates a tree, commit or tag object name.  A
 759        command that takes a <tree-ish> argument ultimately wants to
 760        operate on a <tree> object but automatically dereferences
 761        <commit> and <tag> objects that point at a <tree>.
 762
 763<commit-ish>::
 764        Indicates a commit or tag object name.  A
 765        command that takes a <commit-ish> argument ultimately wants to
 766        operate on a <commit> object but automatically dereferences
 767        <tag> objects that point at a <commit>.
 768
 769<type>::
 770        Indicates that an object type is required.
 771        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 772
 773<file>::
 774        Indicates a filename - almost always relative to the
 775        root of the tree structure `GIT_INDEX_FILE` describes.
 776
 777Symbolic Identifiers
 778--------------------
 779Any Git command accepting any <object> can also use the following
 780symbolic notation:
 781
 782HEAD::
 783        indicates the head of the current branch.
 784
 785<tag>::
 786        a valid tag 'name'
 787        (i.e. a `refs/tags/<tag>` reference).
 788
 789<head>::
 790        a valid head 'name'
 791        (i.e. a `refs/heads/<head>` reference).
 792
 793For a more complete list of ways to spell object names, see
 794"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 795
 796
 797File/Directory Structure
 798------------------------
 799
 800Please see the linkgit:gitrepository-layout[5] document.
 801
 802Read linkgit:githooks[5] for more details about each hook.
 803
 804Higher level SCMs may provide and manage additional information in the
 805`$GIT_DIR`.
 806
 807
 808Terminology
 809-----------
 810Please see linkgit:gitglossary[7].
 811
 812
 813Environment Variables
 814---------------------
 815Various Git commands use the following environment variables:
 816
 817The Git Repository
 818~~~~~~~~~~~~~~~~~~
 819These environment variables apply to 'all' core Git commands. Nb: it
 820is worth noting that they may be used/overridden by SCMS sitting above
 821Git so take care if using a foreign front-end.
 822
 823'GIT_INDEX_FILE'::
 824        This environment allows the specification of an alternate
 825        index file. If not specified, the default of `$GIT_DIR/index`
 826        is used.
 827
 828'GIT_INDEX_VERSION'::
 829        This environment variable allows the specification of an index
 830        version for new repositories.  It won't affect existing index
 831        files.  By default index file version 2 or 3 is used. See
 832        linkgit:git-update-index[1] for more information.
 833
 834'GIT_OBJECT_DIRECTORY'::
 835        If the object storage directory is specified via this
 836        environment variable then the sha1 directories are created
 837        underneath - otherwise the default `$GIT_DIR/objects`
 838        directory is used.
 839
 840'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
 841        Due to the immutable nature of Git objects, old objects can be
 842        archived into shared, read-only directories. This variable
 843        specifies a ":" separated (on Windows ";" separated) list
 844        of Git object directories which can be used to search for Git
 845        objects. New objects will not be written to these directories.
 846
 847'GIT_DIR'::
 848        If the 'GIT_DIR' environment variable is set then it
 849        specifies a path to use instead of the default `.git`
 850        for the base of the repository.
 851        The '--git-dir' command-line option also sets this value.
 852
 853'GIT_WORK_TREE'::
 854        Set the path to the root of the working tree.
 855        This can also be controlled by the '--work-tree' command-line
 856        option and the core.worktree configuration variable.
 857
 858'GIT_NAMESPACE'::
 859        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 860        The '--namespace' command-line option also sets this value.
 861
 862'GIT_CEILING_DIRECTORIES'::
 863        This should be a colon-separated list of absolute paths.  If
 864        set, it is a list of directories that Git should not chdir up
 865        into while looking for a repository directory (useful for
 866        excluding slow-loading network directories).  It will not
 867        exclude the current working directory or a GIT_DIR set on the
 868        command line or in the environment.  Normally, Git has to read
 869        the entries in this list and resolve any symlink that
 870        might be present in order to compare them with the current
 871        directory.  However, if even this access is slow, you
 872        can add an empty entry to the list to tell Git that the
 873        subsequent entries are not symlinks and needn't be resolved;
 874        e.g.,
 875        'GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink'.
 876
 877'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
 878        When run in a directory that does not have ".git" repository
 879        directory, Git tries to find such a directory in the parent
 880        directories to find the top of the working tree, but by default it
 881        does not cross filesystem boundaries.  This environment variable
 882        can be set to true to tell Git not to stop at filesystem
 883        boundaries.  Like 'GIT_CEILING_DIRECTORIES', this will not affect
 884        an explicit repository directory set via 'GIT_DIR' or on the
 885        command line.
 886
 887'GIT_COMMON_DIR'::
 888        If this variable is set to a path, non-worktree files that are
 889        normally in $GIT_DIR will be taken from this path
 890        instead. Worktree-specific files such as HEAD or index are
 891        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 892        linkgit:git-worktree[1] for
 893        details. This variable has lower precedence than other path
 894        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 895
 896Git Commits
 897~~~~~~~~~~~
 898'GIT_AUTHOR_NAME'::
 899'GIT_AUTHOR_EMAIL'::
 900'GIT_AUTHOR_DATE'::
 901'GIT_COMMITTER_NAME'::
 902'GIT_COMMITTER_EMAIL'::
 903'GIT_COMMITTER_DATE'::
 904'EMAIL'::
 905        see linkgit:git-commit-tree[1]
 906
 907Git Diffs
 908~~~~~~~~~
 909'GIT_DIFF_OPTS'::
 910        Only valid setting is "--unified=??" or "-u??" to set the
 911        number of context lines shown when a unified diff is created.
 912        This takes precedence over any "-U" or "--unified" option
 913        value passed on the Git diff command line.
 914
 915'GIT_EXTERNAL_DIFF'::
 916        When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
 917        program named by it is called, instead of the diff invocation
 918        described above.  For a path that is added, removed, or modified,
 919        'GIT_EXTERNAL_DIFF' is called with 7 parameters:
 920
 921        path old-file old-hex old-mode new-file new-hex new-mode
 922+
 923where:
 924
 925        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 926                         contents of <old|new>,
 927        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 928        <old|new>-mode:: are the octal representation of the file modes.
 929+
 930The file parameters can point at the user's working file
 931(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 932when a new file is added), or a temporary file (e.g. `old-file` in the
 933index).  'GIT_EXTERNAL_DIFF' should not worry about unlinking the
 934temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 935+
 936For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 937parameter, <path>.
 938+
 939For each path 'GIT_EXTERNAL_DIFF' is called, two environment variables,
 940'GIT_DIFF_PATH_COUNTER' and 'GIT_DIFF_PATH_TOTAL' are set.
 941
 942'GIT_DIFF_PATH_COUNTER'::
 943        A 1-based counter incremented by one for every path.
 944
 945'GIT_DIFF_PATH_TOTAL'::
 946        The total number of paths.
 947
 948other
 949~~~~~
 950'GIT_MERGE_VERBOSITY'::
 951        A number controlling the amount of output shown by
 952        the recursive merge strategy.  Overrides merge.verbosity.
 953        See linkgit:git-merge[1]
 954
 955'GIT_PAGER'::
 956        This environment variable overrides `$PAGER`. If it is set
 957        to an empty string or to the value "cat", Git will not launch
 958        a pager.  See also the `core.pager` option in
 959        linkgit:git-config[1].
 960
 961'GIT_EDITOR'::
 962        This environment variable overrides `$EDITOR` and `$VISUAL`.
 963        It is used by several Git commands when, on interactive mode,
 964        an editor is to be launched. See also linkgit:git-var[1]
 965        and the `core.editor` option in linkgit:git-config[1].
 966
 967'GIT_SSH'::
 968'GIT_SSH_COMMAND'::
 969        If either of these environment variables is set then 'git fetch'
 970        and 'git push' will use the specified command instead of 'ssh'
 971        when they need to connect to a remote system.
 972        The command will be given exactly two or four arguments: the
 973        'username@host' (or just 'host') from the URL and the shell
 974        command to execute on that remote system, optionally preceded by
 975        '-p' (literally) and the 'port' from the URL when it specifies
 976        something other than the default SSH port.
 977+
 978`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 979by the shell, which allows additional arguments to be included.
 980`$GIT_SSH` on the other hand must be just the path to a program
 981(which can be a wrapper shell script, if additional arguments are
 982needed).
 983+
 984Usually it is easier to configure any desired options through your
 985personal `.ssh/config` file.  Please consult your ssh documentation
 986for further details.
 987
 988'GIT_ASKPASS'::
 989        If this environment variable is set, then Git commands which need to
 990        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
 991        will call this program with a suitable prompt as command-line argument
 992        and read the password from its STDOUT. See also the 'core.askPass'
 993        option in linkgit:git-config[1].
 994
 995'GIT_TERMINAL_PROMPT'::
 996        If this environment variable is set to `0`, git will not prompt
 997        on the terminal (e.g., when asking for HTTP authentication).
 998
 999'GIT_CONFIG_NOSYSTEM'::
1000        Whether to skip reading settings from the system-wide
1001        `$(prefix)/etc/gitconfig` file.  This environment variable can
1002        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
1003        predictable environment for a picky script, or you can set it
1004        temporarily to avoid using a buggy `/etc/gitconfig` file while
1005        waiting for someone with sufficient permissions to fix it.
1006
1007'GIT_FLUSH'::
1008        If this environment variable is set to "1", then commands such
1009        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
1010        'git check-attr' and 'git check-ignore' will
1011        force a flush of the output stream after each record have been
1012        flushed. If this
1013        variable is set to "0", the output of these commands will be done
1014        using completely buffered I/O.   If this environment variable is
1015        not set, Git will choose buffered or record-oriented flushing
1016        based on whether stdout appears to be redirected to a file or not.
1017
1018'GIT_TRACE'::
1019        Enables general trace messages, e.g. alias expansion, built-in
1020        command execution and external command execution.
1021+
1022If this variable is set to "1", "2" or "true" (comparison
1023is case insensitive), trace messages will be printed to
1024stderr.
1025+
1026If the variable is set to an integer value greater than 2
1027and lower than 10 (strictly) then Git will interpret this
1028value as an open file descriptor and will try to write the
1029trace messages into this file descriptor.
1030+
1031Alternatively, if the variable is set to an absolute path
1032(starting with a '/' character), Git will interpret this
1033as a file path and will try to write the trace messages
1034into it.
1035+
1036Unsetting the variable, or setting it to empty, "0" or
1037"false" (case insensitive) disables trace messages.
1038
1039'GIT_TRACE_PACK_ACCESS'::
1040        Enables trace messages for all accesses to any packs. For each
1041        access, the pack file name and an offset in the pack is
1042        recorded. This may be helpful for troubleshooting some
1043        pack-related performance problems.
1044        See 'GIT_TRACE' for available trace output options.
1045
1046'GIT_TRACE_PACKET'::
1047        Enables trace messages for all packets coming in or out of a
1048        given program. This can help with debugging object negotiation
1049        or other protocol issues. Tracing is turned off at a packet
1050        starting with "PACK" (but see 'GIT_TRACE_PACKFILE' below).
1051        See 'GIT_TRACE' for available trace output options.
1052
1053'GIT_TRACE_PACKFILE'::
1054        Enables tracing of packfiles sent or received by a
1055        given program. Unlike other trace output, this trace is
1056        verbatim: no headers, and no quoting of binary data. You almost
1057        certainly want to direct into a file (e.g.,
1058        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1059        the terminal or mixing it with other trace output.
1060+
1061Note that this is currently only implemented for the client side
1062of clones and fetches.
1063
1064'GIT_TRACE_PERFORMANCE'::
1065        Enables performance related trace messages, e.g. total execution
1066        time of each Git command.
1067        See 'GIT_TRACE' for available trace output options.
1068
1069'GIT_TRACE_SETUP'::
1070        Enables trace messages printing the .git, working tree and current
1071        working directory after Git has completed its setup phase.
1072        See 'GIT_TRACE' for available trace output options.
1073
1074'GIT_TRACE_SHALLOW'::
1075        Enables trace messages that can help debugging fetching /
1076        cloning of shallow repositories.
1077        See 'GIT_TRACE' for available trace output options.
1078
1079'GIT_LITERAL_PATHSPECS'::
1080        Setting this variable to `1` will cause Git to treat all
1081        pathspecs literally, rather than as glob patterns. For example,
1082        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1083        for commits that touch the path `*.c`, not any paths that the
1084        glob `*.c` matches. You might want this if you are feeding
1085        literal paths to Git (e.g., paths previously given to you by
1086        `git ls-tree`, `--raw` diff output, etc).
1087
1088'GIT_GLOB_PATHSPECS'::
1089        Setting this variable to `1` will cause Git to treat all
1090        pathspecs as glob patterns (aka "glob" magic).
1091
1092'GIT_NOGLOB_PATHSPECS'::
1093        Setting this variable to `1` will cause Git to treat all
1094        pathspecs as literal (aka "literal" magic).
1095
1096'GIT_ICASE_PATHSPECS'::
1097        Setting this variable to `1` will cause Git to treat all
1098        pathspecs as case-insensitive.
1099
1100'GIT_REFLOG_ACTION'::
1101        When a ref is updated, reflog entries are created to keep
1102        track of the reason why the ref was updated (which is
1103        typically the name of the high-level command that updated
1104        the ref), in addition to the old and new values of the ref.
1105        A scripted Porcelain command can use set_reflog_action
1106        helper function in `git-sh-setup` to set its name to this
1107        variable when it is invoked as the top level command by the
1108        end user, to be recorded in the body of the reflog.
1109
1110'GIT_REF_PARANOIA'::
1111        If set to `1`, include broken or badly named refs when iterating
1112        over lists of refs. In a normal, non-corrupted repository, this
1113        does nothing. However, enabling it may help git to detect and
1114        abort some operations in the presence of broken refs. Git sets
1115        this variable automatically when performing destructive
1116        operations like linkgit:git-prune[1]. You should not need to set
1117        it yourself unless you want to be paranoid about making sure
1118        an operation has touched every ref (e.g., because you are
1119        cloning a repository to make a backup).
1120
1121'GIT_ALLOW_PROTOCOL'::
1122        If set, provide a colon-separated list of protocols which are
1123        allowed to be used with fetch/push/clone. This is useful to
1124        restrict recursive submodule initialization from an untrusted
1125        repository. Any protocol not mentioned will be disallowed (i.e.,
1126        this is a whitelist, not a blacklist). If the variable is not
1127        set at all, all protocols are enabled.  The protocol names
1128        currently used by git are:
1129
1130          - `file`: any local file-based path (including `file://` URLs,
1131            or local paths)
1132
1133          - `git`: the anonymous git protocol over a direct TCP
1134            connection (or proxy, if configured)
1135
1136          - `ssh`: git over ssh (including `host:path` syntax,
1137            `ssh://`, etc).
1138
1139          - `http`: git over http, both "smart http" and "dumb http".
1140            Note that this does _not_ include `https`; if you want both,
1141            you should specify both as `http:https`.
1142
1143          - any external helpers are named by their protocol (e.g., use
1144            `hg` to allow the `git-remote-hg` helper)
1145
1146
1147Discussion[[Discussion]]
1148------------------------
1149
1150More detail on the following is available from the
1151link:user-manual.html#git-concepts[Git concepts chapter of the
1152user-manual] and linkgit:gitcore-tutorial[7].
1153
1154A Git project normally consists of a working directory with a ".git"
1155subdirectory at the top level.  The .git directory contains, among other
1156things, a compressed object database representing the complete history
1157of the project, an "index" file which links that history to the current
1158contents of the working tree, and named pointers into that history such
1159as tags and branch heads.
1160
1161The object database contains objects of three main types: blobs, which
1162hold file data; trees, which point to blobs and other trees to build up
1163directory hierarchies; and commits, which each reference a single tree
1164and some number of parent commits.
1165
1166The commit, equivalent to what other systems call a "changeset" or
1167"version", represents a step in the project's history, and each parent
1168represents an immediately preceding step.  Commits with more than one
1169parent represent merges of independent lines of development.
1170
1171All objects are named by the SHA-1 hash of their contents, normally
1172written as a string of 40 hex digits.  Such names are globally unique.
1173The entire history leading up to a commit can be vouched for by signing
1174just that commit.  A fourth object type, the tag, is provided for this
1175purpose.
1176
1177When first created, objects are stored in individual files, but for
1178efficiency may later be compressed together into "pack files".
1179
1180Named pointers called refs mark interesting points in history.  A ref
1181may contain the SHA-1 name of an object or the name of another ref.  Refs
1182with names beginning `ref/head/` contain the SHA-1 name of the most
1183recent commit (or "head") of a branch under development.  SHA-1 names of
1184tags of interest are stored under `ref/tags/`.  A special ref named
1185`HEAD` contains the name of the currently checked-out branch.
1186
1187The index file is initialized with a list of all paths and, for each
1188path, a blob object and a set of attributes.  The blob object represents
1189the contents of the file as of the head of the current branch.  The
1190attributes (last modified time, size, etc.) are taken from the
1191corresponding file in the working tree.  Subsequent changes to the
1192working tree can be found by comparing these attributes.  The index may
1193be updated with new content, and new commits may be created from the
1194content stored in the index.
1195
1196The index is also capable of storing multiple entries (called "stages")
1197for a given pathname.  These stages are used to hold the various
1198unmerged version of a file when a merge is in progress.
1199
1200FURTHER DOCUMENTATION
1201---------------------
1202
1203See the references in the "description" section to get started
1204using Git.  The following is probably more detail than necessary
1205for a first-time user.
1206
1207The link:user-manual.html#git-concepts[Git concepts chapter of the
1208user-manual] and linkgit:gitcore-tutorial[7] both provide
1209introductions to the underlying Git architecture.
1210
1211See linkgit:gitworkflows[7] for an overview of recommended workflows.
1212
1213See also the link:howto-index.html[howto] documents for some useful
1214examples.
1215
1216The internals are documented in the
1217link:technical/api-index.html[Git API documentation].
1218
1219Users migrating from CVS may also want to
1220read linkgit:gitcvs-migration[7].
1221
1222
1223Authors
1224-------
1225Git was started by Linus Torvalds, and is currently maintained by Junio
1226C Hamano. Numerous contributions have come from the Git mailing list
1227<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1228gives you a more complete list of contributors.
1229
1230If you have a clone of git.git itself, the
1231output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1232the authors for specific parts of the project.
1233
1234Reporting Bugs
1235--------------
1236
1237Report bugs to the Git mailing list <git@vger.kernel.org> where the
1238development and maintenance is primarily done.  You do not have to be
1239subscribed to the list to send a message there.
1240
1241SEE ALSO
1242--------
1243linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1244linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1245linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1246linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1247linkgit:gitworkflows[7]
1248
1249GIT
1250---
1251Part of the linkgit:git[1] suite