Documentation / git.txton commit Merge branch 'po/range-doc' (d0b61dc)
   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
  34A formatted and hyperlinked copy of the latest Git documentation
  35can be viewed at `https://git.github.io/htmldocs/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:v2.10.0/git.html[documentation for release 2.10]
  47
  48* release notes for
  49  link:RelNotes/2.10.0.txt[2.10].
  50
  51* link:v2.9.3/git.html[documentation for release 2.9.3]
  52
  53* release notes for
  54  link:RelNotes/2.9.3.txt[2.9.3],
  55  link:RelNotes/2.9.2.txt[2.9.2],
  56  link:RelNotes/2.9.1.txt[2.9.1],
  57  link:RelNotes/2.9.0.txt[2.9].
  58
  59* link:v2.8.4/git.html[documentation for release 2.8.4]
  60
  61* release notes for
  62  link:RelNotes/2.8.4.txt[2.8.4],
  63  link:RelNotes/2.8.3.txt[2.8.3],
  64  link:RelNotes/2.8.2.txt[2.8.2],
  65  link:RelNotes/2.8.1.txt[2.8.1],
  66  link:RelNotes/2.8.0.txt[2.8].
  67
  68* link:v2.7.3/git.html[documentation for release 2.7.3]
  69
  70* release notes for
  71  link:RelNotes/2.7.3.txt[2.7.3],
  72  link:RelNotes/2.7.2.txt[2.7.2],
  73  link:RelNotes/2.7.1.txt[2.7.1],
  74  link:RelNotes/2.7.0.txt[2.7].
  75
  76* link:v2.6.6/git.html[documentation for release 2.6.6]
  77
  78* release notes for
  79  link:RelNotes/2.6.6.txt[2.6.6],
  80  link:RelNotes/2.6.5.txt[2.6.5],
  81  link:RelNotes/2.6.4.txt[2.6.4],
  82  link:RelNotes/2.6.3.txt[2.6.3],
  83  link:RelNotes/2.6.2.txt[2.6.2],
  84  link:RelNotes/2.6.1.txt[2.6.1],
  85  link:RelNotes/2.6.0.txt[2.6].
  86
  87* link:v2.5.5/git.html[documentation for release 2.5.5]
  88
  89* release notes for
  90  link:RelNotes/2.5.5.txt[2.5.5],
  91  link:RelNotes/2.5.4.txt[2.5.4],
  92  link:RelNotes/2.5.3.txt[2.5.3],
  93  link:RelNotes/2.5.2.txt[2.5.2],
  94  link:RelNotes/2.5.1.txt[2.5.1],
  95  link:RelNotes/2.5.0.txt[2.5].
  96
  97* link:v2.4.11/git.html[documentation for release 2.4.11]
  98
  99* release notes for
 100  link:RelNotes/2.4.11.txt[2.4.11],
 101  link:RelNotes/2.4.10.txt[2.4.10],
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 111  link:RelNotes/2.4.0.txt[2.4].
 112
 113* link:v2.3.10/git.html[documentation for release 2.3.10]
 114
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 117  link:RelNotes/2.3.9.txt[2.3.9],
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 126  link:RelNotes/2.3.0.txt[2.3].
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 128* link:v2.2.3/git.html[documentation for release 2.2.3]
 129
 130* release notes for
 131  link:RelNotes/2.2.3.txt[2.2.3],
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 133  link:RelNotes/2.2.1.txt[2.2.1],
 134  link:RelNotes/2.2.0.txt[2.2].
 135
 136* link:v2.1.4/git.html[documentation for release 2.1.4]
 137
 138* release notes for
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 140  link:RelNotes/2.1.3.txt[2.1.3],
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 143  link:RelNotes/2.1.0.txt[2.1].
 144
 145* link:v2.0.5/git.html[documentation for release 2.0.5]
 146
 147* release notes for
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 149  link:RelNotes/2.0.4.txt[2.0.4],
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 153  link:RelNotes/2.0.0.txt[2.0.0].
 154
 155* link:v1.9.5/git.html[documentation for release 1.9.5]
 156
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 165* link:v1.8.5.6/git.html[documentation for release 1.8.5.6]
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 433  link:RelNotes/1.5.6.5.txt[1.5.6.5],
 434  link:RelNotes/1.5.6.4.txt[1.5.6.4],
 435  link:RelNotes/1.5.6.3.txt[1.5.6.3],
 436  link:RelNotes/1.5.6.2.txt[1.5.6.2],
 437  link:RelNotes/1.5.6.1.txt[1.5.6.1],
 438  link:RelNotes/1.5.6.txt[1.5.6].
 439
 440* link:v1.5.5.6/git.html[documentation for release 1.5.5.6]
 441
 442* release notes for
 443  link:RelNotes/1.5.5.6.txt[1.5.5.6],
 444  link:RelNotes/1.5.5.5.txt[1.5.5.5],
 445  link:RelNotes/1.5.5.4.txt[1.5.5.4],
 446  link:RelNotes/1.5.5.3.txt[1.5.5.3],
 447  link:RelNotes/1.5.5.2.txt[1.5.5.2],
 448  link:RelNotes/1.5.5.1.txt[1.5.5.1],
 449  link:RelNotes/1.5.5.txt[1.5.5].
 450
 451* link:v1.5.4.7/git.html[documentation for release 1.5.4.7]
 452
 453* release notes for
 454  link:RelNotes/1.5.4.7.txt[1.5.4.7],
 455  link:RelNotes/1.5.4.6.txt[1.5.4.6],
 456  link:RelNotes/1.5.4.5.txt[1.5.4.5],
 457  link:RelNotes/1.5.4.4.txt[1.5.4.4],
 458  link:RelNotes/1.5.4.3.txt[1.5.4.3],
 459  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 460  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 461  link:RelNotes/1.5.4.txt[1.5.4].
 462
 463* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 464
 465* release notes for
 466  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 467  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 468  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 469  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 470  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 471  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 472  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 473  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 474  link:RelNotes/1.5.3.txt[1.5.3].
 475
 476* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 477
 478* release notes for
 479  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 480  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 481  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 482  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 483  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 484  link:RelNotes/1.5.2.txt[1.5.2].
 485
 486* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 487
 488* release notes for
 489  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 490  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 491  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 492  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 493  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 494  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 495  link:RelNotes/1.5.1.txt[1.5.1].
 496
 497* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 498
 499* release notes for
 500  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 501  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 502  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 503  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 504  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 505  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 506  link:RelNotes/1.5.0.txt[1.5.0].
 507
 508* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 509  link:v1.3.3/git.html[1.3.3],
 510  link:v1.2.6/git.html[1.2.6],
 511  link:v1.0.13/git.html[1.0.13].
 512
 513============
 514
 515endif::stalenotes[]
 516
 517OPTIONS
 518-------
 519--version::
 520        Prints the Git suite version that the 'git' program came from.
 521
 522--help::
 523        Prints the synopsis and a list of the most commonly used
 524        commands. If the option `--all` or `-a` is given then all
 525        available commands are printed. If a Git command is named this
 526        option will bring up the manual page for that command.
 527+
 528Other options are available to control how the manual page is
 529displayed. See linkgit:git-help[1] for more information,
 530because `git --help ...` is converted internally into `git
 531help ...`.
 532
 533-C <path>::
 534        Run as if git was started in '<path>' instead of the current working
 535        directory.  When multiple `-C` options are given, each subsequent
 536        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 537        <path>`.
 538+
 539This option affects options that expect path name like `--git-dir` and
 540`--work-tree` in that their interpretations of the path names would be
 541made relative to the working directory caused by the `-C` option. For
 542example the following invocations are equivalent:
 543
 544    git --git-dir=a.git --work-tree=b -C c status
 545    git --git-dir=c/a.git --work-tree=c/b status
 546
 547-c <name>=<value>::
 548        Pass a configuration parameter to the command. The value
 549        given will override values from configuration files.
 550        The <name> is expected in the same format as listed by
 551        'git config' (subkeys separated by dots).
 552+
 553Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 554`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 555config file). Including the equals but with an empty value (like `git -c
 556foo.bar= ...`) sets `foo.bar` to the empty string.
 557
 558--exec-path[=<path>]::
 559        Path to wherever your core Git programs are installed.
 560        This can also be controlled by setting the GIT_EXEC_PATH
 561        environment variable. If no path is given, 'git' will print
 562        the current setting and then exit.
 563
 564--html-path::
 565        Print the path, without trailing slash, where Git's HTML
 566        documentation is installed and exit.
 567
 568--man-path::
 569        Print the manpath (see `man(1)`) for the man pages for
 570        this version of Git and exit.
 571
 572--info-path::
 573        Print the path where the Info files documenting this
 574        version of Git are installed and exit.
 575
 576-p::
 577--paginate::
 578        Pipe all output into 'less' (or if set, $PAGER) if standard
 579        output is a terminal.  This overrides the `pager.<cmd>`
 580        configuration options (see the "Configuration Mechanism" section
 581        below).
 582
 583--no-pager::
 584        Do not pipe Git output into a pager.
 585
 586--git-dir=<path>::
 587        Set the path to the repository. This can also be controlled by
 588        setting the `GIT_DIR` environment variable. It can be an absolute
 589        path or relative path to current working directory.
 590
 591--work-tree=<path>::
 592        Set the path to the working tree. It can be an absolute path
 593        or a path relative to the current working directory.
 594        This can also be controlled by setting the GIT_WORK_TREE
 595        environment variable and the core.worktree configuration
 596        variable (see core.worktree in linkgit:git-config[1] for a
 597        more detailed discussion).
 598
 599--namespace=<path>::
 600        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 601        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 602        variable.
 603
 604--bare::
 605        Treat the repository as a bare repository.  If GIT_DIR
 606        environment is not set, it is set to the current working
 607        directory.
 608
 609--no-replace-objects::
 610        Do not use replacement refs to replace Git objects. See
 611        linkgit:git-replace[1] for more information.
 612
 613--literal-pathspecs::
 614        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 615        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 616        variable to `1`.
 617
 618--glob-pathspecs::
 619        Add "glob" magic to all pathspec. This is equivalent to setting
 620        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 621        globbing on individual pathspecs can be done using pathspec
 622        magic ":(literal)"
 623
 624--noglob-pathspecs::
 625        Add "literal" magic to all pathspec. This is equivalent to setting
 626        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 627        globbing on individual pathspecs can be done using pathspec
 628        magic ":(glob)"
 629
 630--icase-pathspecs::
 631        Add "icase" magic to all pathspec. This is equivalent to setting
 632        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 633
 634GIT COMMANDS
 635------------
 636
 637We divide Git into high level ("porcelain") commands and low level
 638("plumbing") commands.
 639
 640High-level commands (porcelain)
 641-------------------------------
 642
 643We separate the porcelain commands into the main commands and some
 644ancillary user utilities.
 645
 646Main porcelain commands
 647~~~~~~~~~~~~~~~~~~~~~~~
 648
 649include::cmds-mainporcelain.txt[]
 650
 651Ancillary Commands
 652~~~~~~~~~~~~~~~~~~
 653Manipulators:
 654
 655include::cmds-ancillarymanipulators.txt[]
 656
 657Interrogators:
 658
 659include::cmds-ancillaryinterrogators.txt[]
 660
 661
 662Interacting with Others
 663~~~~~~~~~~~~~~~~~~~~~~~
 664
 665These commands are to interact with foreign SCM and with other
 666people via patch over e-mail.
 667
 668include::cmds-foreignscminterface.txt[]
 669
 670
 671Low-level commands (plumbing)
 672-----------------------------
 673
 674Although Git includes its
 675own porcelain layer, its low-level commands are sufficient to support
 676development of alternative porcelains.  Developers of such porcelains
 677might start by reading about linkgit:git-update-index[1] and
 678linkgit:git-read-tree[1].
 679
 680The interface (input, output, set of options and the semantics)
 681to these low-level commands are meant to be a lot more stable
 682than Porcelain level commands, because these commands are
 683primarily for scripted use.  The interface to Porcelain commands
 684on the other hand are subject to change in order to improve the
 685end user experience.
 686
 687The following description divides
 688the low-level commands into commands that manipulate objects (in
 689the repository, index, and working tree), commands that interrogate and
 690compare objects, and commands that move objects and references between
 691repositories.
 692
 693
 694Manipulation commands
 695~~~~~~~~~~~~~~~~~~~~~
 696
 697include::cmds-plumbingmanipulators.txt[]
 698
 699
 700Interrogation commands
 701~~~~~~~~~~~~~~~~~~~~~~
 702
 703include::cmds-plumbinginterrogators.txt[]
 704
 705In general, the interrogate commands do not touch the files in
 706the working tree.
 707
 708
 709Synching repositories
 710~~~~~~~~~~~~~~~~~~~~~
 711
 712include::cmds-synchingrepositories.txt[]
 713
 714The following are helper commands used by the above; end users
 715typically do not use them directly.
 716
 717include::cmds-synchelpers.txt[]
 718
 719
 720Internal helper commands
 721~~~~~~~~~~~~~~~~~~~~~~~~
 722
 723These are internal helper commands used by other commands; end
 724users typically do not use them directly.
 725
 726include::cmds-purehelpers.txt[]
 727
 728
 729Configuration Mechanism
 730-----------------------
 731
 732Git uses a simple text format to store customizations that are per
 733repository and are per user.  Such a configuration file may look
 734like this:
 735
 736------------
 737#
 738# A '#' or ';' character indicates a comment.
 739#
 740
 741; core variables
 742[core]
 743        ; Don't trust file modes
 744        filemode = false
 745
 746; user identity
 747[user]
 748        name = "Junio C Hamano"
 749        email = "gitster@pobox.com"
 750
 751------------
 752
 753Various commands read from the configuration file and adjust
 754their operation accordingly.  See linkgit:git-config[1] for a
 755list and more details about the configuration mechanism.
 756
 757
 758Identifier Terminology
 759----------------------
 760<object>::
 761        Indicates the object name for any type of object.
 762
 763<blob>::
 764        Indicates a blob object name.
 765
 766<tree>::
 767        Indicates a tree object name.
 768
 769<commit>::
 770        Indicates a commit object name.
 771
 772<tree-ish>::
 773        Indicates a tree, commit or tag object name.  A
 774        command that takes a <tree-ish> argument ultimately wants to
 775        operate on a <tree> object but automatically dereferences
 776        <commit> and <tag> objects that point at a <tree>.
 777
 778<commit-ish>::
 779        Indicates a commit or tag object name.  A
 780        command that takes a <commit-ish> argument ultimately wants to
 781        operate on a <commit> object but automatically dereferences
 782        <tag> objects that point at a <commit>.
 783
 784<type>::
 785        Indicates that an object type is required.
 786        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 787
 788<file>::
 789        Indicates a filename - almost always relative to the
 790        root of the tree structure `GIT_INDEX_FILE` describes.
 791
 792Symbolic Identifiers
 793--------------------
 794Any Git command accepting any <object> can also use the following
 795symbolic notation:
 796
 797HEAD::
 798        indicates the head of the current branch.
 799
 800<tag>::
 801        a valid tag 'name'
 802        (i.e. a `refs/tags/<tag>` reference).
 803
 804<head>::
 805        a valid head 'name'
 806        (i.e. a `refs/heads/<head>` reference).
 807
 808For a more complete list of ways to spell object names, see
 809"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 810
 811
 812File/Directory Structure
 813------------------------
 814
 815Please see the linkgit:gitrepository-layout[5] document.
 816
 817Read linkgit:githooks[5] for more details about each hook.
 818
 819Higher level SCMs may provide and manage additional information in the
 820`$GIT_DIR`.
 821
 822
 823Terminology
 824-----------
 825Please see linkgit:gitglossary[7].
 826
 827
 828Environment Variables
 829---------------------
 830Various Git commands use the following environment variables:
 831
 832The Git Repository
 833~~~~~~~~~~~~~~~~~~
 834These environment variables apply to 'all' core Git commands. Nb: it
 835is worth noting that they may be used/overridden by SCMS sitting above
 836Git so take care if using a foreign front-end.
 837
 838`GIT_INDEX_FILE`::
 839        This environment allows the specification of an alternate
 840        index file. If not specified, the default of `$GIT_DIR/index`
 841        is used.
 842
 843`GIT_INDEX_VERSION`::
 844        This environment variable allows the specification of an index
 845        version for new repositories.  It won't affect existing index
 846        files.  By default index file version 2 or 3 is used. See
 847        linkgit:git-update-index[1] for more information.
 848
 849`GIT_OBJECT_DIRECTORY`::
 850        If the object storage directory is specified via this
 851        environment variable then the sha1 directories are created
 852        underneath - otherwise the default `$GIT_DIR/objects`
 853        directory is used.
 854
 855`GIT_ALTERNATE_OBJECT_DIRECTORIES`::
 856        Due to the immutable nature of Git objects, old objects can be
 857        archived into shared, read-only directories. This variable
 858        specifies a ":" separated (on Windows ";" separated) list
 859        of Git object directories which can be used to search for Git
 860        objects. New objects will not be written to these directories.
 861
 862`GIT_DIR`::
 863        If the `GIT_DIR` environment variable is set then it
 864        specifies a path to use instead of the default `.git`
 865        for the base of the repository.
 866        The `--git-dir` command-line option also sets this value.
 867
 868`GIT_WORK_TREE`::
 869        Set the path to the root of the working tree.
 870        This can also be controlled by the `--work-tree` command-line
 871        option and the core.worktree configuration variable.
 872
 873`GIT_NAMESPACE`::
 874        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 875        The `--namespace` command-line option also sets this value.
 876
 877`GIT_CEILING_DIRECTORIES`::
 878        This should be a colon-separated list of absolute paths.  If
 879        set, it is a list of directories that Git should not chdir up
 880        into while looking for a repository directory (useful for
 881        excluding slow-loading network directories).  It will not
 882        exclude the current working directory or a GIT_DIR set on the
 883        command line or in the environment.  Normally, Git has to read
 884        the entries in this list and resolve any symlink that
 885        might be present in order to compare them with the current
 886        directory.  However, if even this access is slow, you
 887        can add an empty entry to the list to tell Git that the
 888        subsequent entries are not symlinks and needn't be resolved;
 889        e.g.,
 890        `GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink`.
 891
 892`GIT_DISCOVERY_ACROSS_FILESYSTEM`::
 893        When run in a directory that does not have ".git" repository
 894        directory, Git tries to find such a directory in the parent
 895        directories to find the top of the working tree, but by default it
 896        does not cross filesystem boundaries.  This environment variable
 897        can be set to true to tell Git not to stop at filesystem
 898        boundaries.  Like `GIT_CEILING_DIRECTORIES`, this will not affect
 899        an explicit repository directory set via `GIT_DIR` or on the
 900        command line.
 901
 902`GIT_COMMON_DIR`::
 903        If this variable is set to a path, non-worktree files that are
 904        normally in $GIT_DIR will be taken from this path
 905        instead. Worktree-specific files such as HEAD or index are
 906        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 907        linkgit:git-worktree[1] for
 908        details. This variable has lower precedence than other path
 909        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 910
 911Git Commits
 912~~~~~~~~~~~
 913`GIT_AUTHOR_NAME`::
 914`GIT_AUTHOR_EMAIL`::
 915`GIT_AUTHOR_DATE`::
 916`GIT_COMMITTER_NAME`::
 917`GIT_COMMITTER_EMAIL`::
 918`GIT_COMMITTER_DATE`::
 919'EMAIL'::
 920        see linkgit:git-commit-tree[1]
 921
 922Git Diffs
 923~~~~~~~~~
 924`GIT_DIFF_OPTS`::
 925        Only valid setting is "--unified=??" or "-u??" to set the
 926        number of context lines shown when a unified diff is created.
 927        This takes precedence over any "-U" or "--unified" option
 928        value passed on the Git diff command line.
 929
 930`GIT_EXTERNAL_DIFF`::
 931        When the environment variable `GIT_EXTERNAL_DIFF` is set, the
 932        program named by it is called, instead of the diff invocation
 933        described above.  For a path that is added, removed, or modified,
 934        `GIT_EXTERNAL_DIFF` is called with 7 parameters:
 935
 936        path old-file old-hex old-mode new-file new-hex new-mode
 937+
 938where:
 939
 940        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 941                         contents of <old|new>,
 942        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 943        <old|new>-mode:: are the octal representation of the file modes.
 944+
 945The file parameters can point at the user's working file
 946(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 947when a new file is added), or a temporary file (e.g. `old-file` in the
 948index).  `GIT_EXTERNAL_DIFF` should not worry about unlinking the
 949temporary file --- it is removed when `GIT_EXTERNAL_DIFF` exits.
 950+
 951For a path that is unmerged, `GIT_EXTERNAL_DIFF` is called with 1
 952parameter, <path>.
 953+
 954For each path `GIT_EXTERNAL_DIFF` is called, two environment variables,
 955`GIT_DIFF_PATH_COUNTER` and `GIT_DIFF_PATH_TOTAL` are set.
 956
 957`GIT_DIFF_PATH_COUNTER`::
 958        A 1-based counter incremented by one for every path.
 959
 960`GIT_DIFF_PATH_TOTAL`::
 961        The total number of paths.
 962
 963other
 964~~~~~
 965`GIT_MERGE_VERBOSITY`::
 966        A number controlling the amount of output shown by
 967        the recursive merge strategy.  Overrides merge.verbosity.
 968        See linkgit:git-merge[1]
 969
 970`GIT_PAGER`::
 971        This environment variable overrides `$PAGER`. If it is set
 972        to an empty string or to the value "cat", Git will not launch
 973        a pager.  See also the `core.pager` option in
 974        linkgit:git-config[1].
 975
 976`GIT_EDITOR`::
 977        This environment variable overrides `$EDITOR` and `$VISUAL`.
 978        It is used by several Git commands when, on interactive mode,
 979        an editor is to be launched. See also linkgit:git-var[1]
 980        and the `core.editor` option in linkgit:git-config[1].
 981
 982`GIT_SSH`::
 983`GIT_SSH_COMMAND`::
 984        If either of these environment variables is set then 'git fetch'
 985        and 'git push' will use the specified command instead of 'ssh'
 986        when they need to connect to a remote system.
 987        The command will be given exactly two or four arguments: the
 988        'username@host' (or just 'host') from the URL and the shell
 989        command to execute on that remote system, optionally preceded by
 990        `-p` (literally) and the 'port' from the URL when it specifies
 991        something other than the default SSH port.
 992+
 993`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 994by the shell, which allows additional arguments to be included.
 995`$GIT_SSH` on the other hand must be just the path to a program
 996(which can be a wrapper shell script, if additional arguments are
 997needed).
 998+
 999Usually it is easier to configure any desired options through your
1000personal `.ssh/config` file.  Please consult your ssh documentation
1001for further details.
1002
1003`GIT_ASKPASS`::
1004        If this environment variable is set, then Git commands which need to
1005        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
1006        will call this program with a suitable prompt as command-line argument
1007        and read the password from its STDOUT. See also the `core.askPass`
1008        option in linkgit:git-config[1].
1009
1010`GIT_TERMINAL_PROMPT`::
1011        If this environment variable is set to `0`, git will not prompt
1012        on the terminal (e.g., when asking for HTTP authentication).
1013
1014`GIT_CONFIG_NOSYSTEM`::
1015        Whether to skip reading settings from the system-wide
1016        `$(prefix)/etc/gitconfig` file.  This environment variable can
1017        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
1018        predictable environment for a picky script, or you can set it
1019        temporarily to avoid using a buggy `/etc/gitconfig` file while
1020        waiting for someone with sufficient permissions to fix it.
1021
1022`GIT_FLUSH`::
1023        If this environment variable is set to "1", then commands such
1024        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
1025        'git check-attr' and 'git check-ignore' will
1026        force a flush of the output stream after each record have been
1027        flushed. If this
1028        variable is set to "0", the output of these commands will be done
1029        using completely buffered I/O.   If this environment variable is
1030        not set, Git will choose buffered or record-oriented flushing
1031        based on whether stdout appears to be redirected to a file or not.
1032
1033`GIT_TRACE`::
1034        Enables general trace messages, e.g. alias expansion, built-in
1035        command execution and external command execution.
1036+
1037If this variable is set to "1", "2" or "true" (comparison
1038is case insensitive), trace messages will be printed to
1039stderr.
1040+
1041If the variable is set to an integer value greater than 2
1042and lower than 10 (strictly) then Git will interpret this
1043value as an open file descriptor and will try to write the
1044trace messages into this file descriptor.
1045+
1046Alternatively, if the variable is set to an absolute path
1047(starting with a '/' character), Git will interpret this
1048as a file path and will try to write the trace messages
1049into it.
1050+
1051Unsetting the variable, or setting it to empty, "0" or
1052"false" (case insensitive) disables trace messages.
1053
1054`GIT_TRACE_PACK_ACCESS`::
1055        Enables trace messages for all accesses to any packs. For each
1056        access, the pack file name and an offset in the pack is
1057        recorded. This may be helpful for troubleshooting some
1058        pack-related performance problems.
1059        See `GIT_TRACE` for available trace output options.
1060
1061`GIT_TRACE_PACKET`::
1062        Enables trace messages for all packets coming in or out of a
1063        given program. This can help with debugging object negotiation
1064        or other protocol issues. Tracing is turned off at a packet
1065        starting with "PACK" (but see `GIT_TRACE_PACKFILE` below).
1066        See `GIT_TRACE` for available trace output options.
1067
1068`GIT_TRACE_PACKFILE`::
1069        Enables tracing of packfiles sent or received by a
1070        given program. Unlike other trace output, this trace is
1071        verbatim: no headers, and no quoting of binary data. You almost
1072        certainly want to direct into a file (e.g.,
1073        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1074        the terminal or mixing it with other trace output.
1075+
1076Note that this is currently only implemented for the client side
1077of clones and fetches.
1078
1079`GIT_TRACE_PERFORMANCE`::
1080        Enables performance related trace messages, e.g. total execution
1081        time of each Git command.
1082        See `GIT_TRACE` for available trace output options.
1083
1084`GIT_TRACE_SETUP`::
1085        Enables trace messages printing the .git, working tree and current
1086        working directory after Git has completed its setup phase.
1087        See `GIT_TRACE` for available trace output options.
1088
1089`GIT_TRACE_SHALLOW`::
1090        Enables trace messages that can help debugging fetching /
1091        cloning of shallow repositories.
1092        See `GIT_TRACE` for available trace output options.
1093
1094`GIT_TRACE_CURL`::
1095        Enables a curl full trace dump of all incoming and outgoing data,
1096        including descriptive information, of the git transport protocol.
1097        This is similar to doing curl `--trace-ascii` on the command line.
1098        This option overrides setting the `GIT_CURL_VERBOSE` environment
1099        variable.
1100        See `GIT_TRACE` for available trace output options.
1101
1102`GIT_LITERAL_PATHSPECS`::
1103        Setting this variable to `1` will cause Git to treat all
1104        pathspecs literally, rather than as glob patterns. For example,
1105        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1106        for commits that touch the path `*.c`, not any paths that the
1107        glob `*.c` matches. You might want this if you are feeding
1108        literal paths to Git (e.g., paths previously given to you by
1109        `git ls-tree`, `--raw` diff output, etc).
1110
1111`GIT_GLOB_PATHSPECS`::
1112        Setting this variable to `1` will cause Git to treat all
1113        pathspecs as glob patterns (aka "glob" magic).
1114
1115`GIT_NOGLOB_PATHSPECS`::
1116        Setting this variable to `1` will cause Git to treat all
1117        pathspecs as literal (aka "literal" magic).
1118
1119`GIT_ICASE_PATHSPECS`::
1120        Setting this variable to `1` will cause Git to treat all
1121        pathspecs as case-insensitive.
1122
1123`GIT_REFLOG_ACTION`::
1124        When a ref is updated, reflog entries are created to keep
1125        track of the reason why the ref was updated (which is
1126        typically the name of the high-level command that updated
1127        the ref), in addition to the old and new values of the ref.
1128        A scripted Porcelain command can use set_reflog_action
1129        helper function in `git-sh-setup` to set its name to this
1130        variable when it is invoked as the top level command by the
1131        end user, to be recorded in the body of the reflog.
1132
1133`GIT_REF_PARANOIA`::
1134        If set to `1`, include broken or badly named refs when iterating
1135        over lists of refs. In a normal, non-corrupted repository, this
1136        does nothing. However, enabling it may help git to detect and
1137        abort some operations in the presence of broken refs. Git sets
1138        this variable automatically when performing destructive
1139        operations like linkgit:git-prune[1]. You should not need to set
1140        it yourself unless you want to be paranoid about making sure
1141        an operation has touched every ref (e.g., because you are
1142        cloning a repository to make a backup).
1143
1144`GIT_ALLOW_PROTOCOL`::
1145        If set, provide a colon-separated list of protocols which are
1146        allowed to be used with fetch/push/clone. This is useful to
1147        restrict recursive submodule initialization from an untrusted
1148        repository. Any protocol not mentioned will be disallowed (i.e.,
1149        this is a whitelist, not a blacklist). If the variable is not
1150        set at all, all protocols are enabled.  The protocol names
1151        currently used by git are:
1152
1153          - `file`: any local file-based path (including `file://` URLs,
1154            or local paths)
1155
1156          - `git`: the anonymous git protocol over a direct TCP
1157            connection (or proxy, if configured)
1158
1159          - `ssh`: git over ssh (including `host:path` syntax,
1160            `ssh://`, etc).
1161
1162          - `http`: git over http, both "smart http" and "dumb http".
1163            Note that this does _not_ include `https`; if you want both,
1164            you should specify both as `http:https`.
1165
1166          - any external helpers are named by their protocol (e.g., use
1167            `hg` to allow the `git-remote-hg` helper)
1168
1169
1170Discussion[[Discussion]]
1171------------------------
1172
1173More detail on the following is available from the
1174link:user-manual.html#git-concepts[Git concepts chapter of the
1175user-manual] and linkgit:gitcore-tutorial[7].
1176
1177A Git project normally consists of a working directory with a ".git"
1178subdirectory at the top level.  The .git directory contains, among other
1179things, a compressed object database representing the complete history
1180of the project, an "index" file which links that history to the current
1181contents of the working tree, and named pointers into that history such
1182as tags and branch heads.
1183
1184The object database contains objects of three main types: blobs, which
1185hold file data; trees, which point to blobs and other trees to build up
1186directory hierarchies; and commits, which each reference a single tree
1187and some number of parent commits.
1188
1189The commit, equivalent to what other systems call a "changeset" or
1190"version", represents a step in the project's history, and each parent
1191represents an immediately preceding step.  Commits with more than one
1192parent represent merges of independent lines of development.
1193
1194All objects are named by the SHA-1 hash of their contents, normally
1195written as a string of 40 hex digits.  Such names are globally unique.
1196The entire history leading up to a commit can be vouched for by signing
1197just that commit.  A fourth object type, the tag, is provided for this
1198purpose.
1199
1200When first created, objects are stored in individual files, but for
1201efficiency may later be compressed together into "pack files".
1202
1203Named pointers called refs mark interesting points in history.  A ref
1204may contain the SHA-1 name of an object or the name of another ref.  Refs
1205with names beginning `ref/head/` contain the SHA-1 name of the most
1206recent commit (or "head") of a branch under development.  SHA-1 names of
1207tags of interest are stored under `ref/tags/`.  A special ref named
1208`HEAD` contains the name of the currently checked-out branch.
1209
1210The index file is initialized with a list of all paths and, for each
1211path, a blob object and a set of attributes.  The blob object represents
1212the contents of the file as of the head of the current branch.  The
1213attributes (last modified time, size, etc.) are taken from the
1214corresponding file in the working tree.  Subsequent changes to the
1215working tree can be found by comparing these attributes.  The index may
1216be updated with new content, and new commits may be created from the
1217content stored in the index.
1218
1219The index is also capable of storing multiple entries (called "stages")
1220for a given pathname.  These stages are used to hold the various
1221unmerged version of a file when a merge is in progress.
1222
1223FURTHER DOCUMENTATION
1224---------------------
1225
1226See the references in the "description" section to get started
1227using Git.  The following is probably more detail than necessary
1228for a first-time user.
1229
1230The link:user-manual.html#git-concepts[Git concepts chapter of the
1231user-manual] and linkgit:gitcore-tutorial[7] both provide
1232introductions to the underlying Git architecture.
1233
1234See linkgit:gitworkflows[7] for an overview of recommended workflows.
1235
1236See also the link:howto-index.html[howto] documents for some useful
1237examples.
1238
1239The internals are documented in the
1240link:technical/api-index.html[Git API documentation].
1241
1242Users migrating from CVS may also want to
1243read linkgit:gitcvs-migration[7].
1244
1245
1246Authors
1247-------
1248Git was started by Linus Torvalds, and is currently maintained by Junio
1249C Hamano. Numerous contributions have come from the Git mailing list
1250<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1251gives you a more complete list of contributors.
1252
1253If you have a clone of git.git itself, the
1254output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1255the authors for specific parts of the project.
1256
1257Reporting Bugs
1258--------------
1259
1260Report bugs to the Git mailing list <git@vger.kernel.org> where the
1261development and maintenance is primarily done.  You do not have to be
1262subscribed to the list to send a message there.
1263
1264SEE ALSO
1265--------
1266linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1267linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1268linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1269linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1270linkgit:gitworkflows[7]
1271
1272GIT
1273---
1274Part of the linkgit:git[1] suite