Documentation / git.txton commit Merge branch 'jk/http-walker-buffer-underflow-fix' (2af882b)
   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    [--super-prefix=<path>]
  17    <command> [<args>]
  18
  19DESCRIPTION
  20-----------
  21Git is a fast, scalable, distributed revision control system with an
  22unusually rich command set that provides both high-level operations
  23and full access to internals.
  24
  25See linkgit:gittutorial[7] to get started, then see
  26linkgit:giteveryday[7] for a useful minimum set of
  27commands.  The link:user-manual.html[Git User's Manual] has a more
  28in-depth introduction.
  29
  30After you mastered the basic concepts, you can come back to this
  31page to learn what commands Git offers.  You can learn more about
  32individual Git commands with "git help command".  linkgit:gitcli[7]
  33manual page gives you an overview of the command-line command syntax.
  34
  35A formatted and hyperlinked copy of the latest Git documentation
  36can be viewed at `https://git.github.io/htmldocs/git.html`.
  37
  38ifdef::stalenotes[]
  39[NOTE]
  40============
  41
  42You are reading the documentation for the latest (possibly
  43unreleased) version of Git, that is available from the 'master'
  44branch of the `git.git` repository.
  45Documentation for older releases are available here:
  46
  47* link:v2.12.0/git.html[documentation for release 2.12.0]
  48
  49* release notes for
  50  link:RelNotes/2.12.0.txt[2.12].
  51
  52* link:v2.11.1/git.html[documentation for release 2.11.1]
  53
  54* release notes for
  55  link:RelNotes/2.11.1.txt[2.11.1],
  56  link:RelNotes/2.11.0.txt[2.11].
  57
  58* link:v2.10.2/git.html[documentation for release 2.10.2]
  59
  60* release notes for
  61  link:RelNotes/2.10.2.txt[2.10.2],
  62  link:RelNotes/2.10.1.txt[2.10.1],
  63  link:RelNotes/2.10.0.txt[2.10].
  64
  65* link:v2.9.3/git.html[documentation for release 2.9.3]
  66
  67* release notes for
  68  link:RelNotes/2.9.3.txt[2.9.3],
  69  link:RelNotes/2.9.2.txt[2.9.2],
  70  link:RelNotes/2.9.1.txt[2.9.1],
  71  link:RelNotes/2.9.0.txt[2.9].
  72
  73* link:v2.8.4/git.html[documentation for release 2.8.4]
  74
  75* release notes for
  76  link:RelNotes/2.8.4.txt[2.8.4],
  77  link:RelNotes/2.8.3.txt[2.8.3],
  78  link:RelNotes/2.8.2.txt[2.8.2],
  79  link:RelNotes/2.8.1.txt[2.8.1],
  80  link:RelNotes/2.8.0.txt[2.8].
  81
  82* link:v2.7.3/git.html[documentation for release 2.7.3]
  83
  84* release notes for
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  86  link:RelNotes/2.7.2.txt[2.7.2],
  87  link:RelNotes/2.7.1.txt[2.7.1],
  88  link:RelNotes/2.7.0.txt[2.7].
  89
  90* link:v2.6.6/git.html[documentation for release 2.6.6]
  91
  92* release notes for
  93  link:RelNotes/2.6.6.txt[2.6.6],
  94  link:RelNotes/2.6.5.txt[2.6.5],
  95  link:RelNotes/2.6.4.txt[2.6.4],
  96  link:RelNotes/2.6.3.txt[2.6.3],
  97  link:RelNotes/2.6.2.txt[2.6.2],
  98  link:RelNotes/2.6.1.txt[2.6.1],
  99  link:RelNotes/2.6.0.txt[2.6].
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 102
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 148  link:RelNotes/2.2.0.txt[2.2].
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 150* link:v2.1.4/git.html[documentation for release 2.1.4]
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 436  link:RelNotes/1.6.0.5.txt[1.6.0.5],
 437  link:RelNotes/1.6.0.4.txt[1.6.0.4],
 438  link:RelNotes/1.6.0.3.txt[1.6.0.3],
 439  link:RelNotes/1.6.0.2.txt[1.6.0.2],
 440  link:RelNotes/1.6.0.1.txt[1.6.0.1],
 441  link:RelNotes/1.6.0.txt[1.6.0].
 442
 443* link:v1.5.6.6/git.html[documentation for release 1.5.6.6]
 444
 445* release notes for
 446  link:RelNotes/1.5.6.6.txt[1.5.6.6],
 447  link:RelNotes/1.5.6.5.txt[1.5.6.5],
 448  link:RelNotes/1.5.6.4.txt[1.5.6.4],
 449  link:RelNotes/1.5.6.3.txt[1.5.6.3],
 450  link:RelNotes/1.5.6.2.txt[1.5.6.2],
 451  link:RelNotes/1.5.6.1.txt[1.5.6.1],
 452  link:RelNotes/1.5.6.txt[1.5.6].
 453
 454* link:v1.5.5.6/git.html[documentation for release 1.5.5.6]
 455
 456* release notes for
 457  link:RelNotes/1.5.5.6.txt[1.5.5.6],
 458  link:RelNotes/1.5.5.5.txt[1.5.5.5],
 459  link:RelNotes/1.5.5.4.txt[1.5.5.4],
 460  link:RelNotes/1.5.5.3.txt[1.5.5.3],
 461  link:RelNotes/1.5.5.2.txt[1.5.5.2],
 462  link:RelNotes/1.5.5.1.txt[1.5.5.1],
 463  link:RelNotes/1.5.5.txt[1.5.5].
 464
 465* link:v1.5.4.7/git.html[documentation for release 1.5.4.7]
 466
 467* release notes for
 468  link:RelNotes/1.5.4.7.txt[1.5.4.7],
 469  link:RelNotes/1.5.4.6.txt[1.5.4.6],
 470  link:RelNotes/1.5.4.5.txt[1.5.4.5],
 471  link:RelNotes/1.5.4.4.txt[1.5.4.4],
 472  link:RelNotes/1.5.4.3.txt[1.5.4.3],
 473  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 474  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 475  link:RelNotes/1.5.4.txt[1.5.4].
 476
 477* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 478
 479* release notes for
 480  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 481  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 482  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 483  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 484  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 485  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 486  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 487  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 488  link:RelNotes/1.5.3.txt[1.5.3].
 489
 490* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 491
 492* release notes for
 493  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 494  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 495  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 496  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 497  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 498  link:RelNotes/1.5.2.txt[1.5.2].
 499
 500* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 501
 502* release notes for
 503  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 504  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 505  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 506  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 507  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 508  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 509  link:RelNotes/1.5.1.txt[1.5.1].
 510
 511* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 512
 513* release notes for
 514  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 515  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 516  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 517  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 518  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 519  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 520  link:RelNotes/1.5.0.txt[1.5.0].
 521
 522* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 523  link:v1.3.3/git.html[1.3.3],
 524  link:v1.2.6/git.html[1.2.6],
 525  link:v1.0.13/git.html[1.0.13].
 526
 527============
 528
 529endif::stalenotes[]
 530
 531OPTIONS
 532-------
 533--version::
 534        Prints the Git suite version that the 'git' program came from.
 535
 536--help::
 537        Prints the synopsis and a list of the most commonly used
 538        commands. If the option `--all` or `-a` is given then all
 539        available commands are printed. If a Git command is named this
 540        option will bring up the manual page for that command.
 541+
 542Other options are available to control how the manual page is
 543displayed. See linkgit:git-help[1] for more information,
 544because `git --help ...` is converted internally into `git
 545help ...`.
 546
 547-C <path>::
 548        Run as if git was started in '<path>' instead of the current working
 549        directory.  When multiple `-C` options are given, each subsequent
 550        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 551        <path>`.
 552+
 553This option affects options that expect path name like `--git-dir` and
 554`--work-tree` in that their interpretations of the path names would be
 555made relative to the working directory caused by the `-C` option. For
 556example the following invocations are equivalent:
 557
 558    git --git-dir=a.git --work-tree=b -C c status
 559    git --git-dir=c/a.git --work-tree=c/b status
 560
 561-c <name>=<value>::
 562        Pass a configuration parameter to the command. The value
 563        given will override values from configuration files.
 564        The <name> is expected in the same format as listed by
 565        'git config' (subkeys separated by dots).
 566+
 567Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 568`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 569config file). Including the equals but with an empty value (like `git -c
 570foo.bar= ...`) sets `foo.bar` to the empty string.
 571
 572--exec-path[=<path>]::
 573        Path to wherever your core Git programs are installed.
 574        This can also be controlled by setting the GIT_EXEC_PATH
 575        environment variable. If no path is given, 'git' will print
 576        the current setting and then exit.
 577
 578--html-path::
 579        Print the path, without trailing slash, where Git's HTML
 580        documentation is installed and exit.
 581
 582--man-path::
 583        Print the manpath (see `man(1)`) for the man pages for
 584        this version of Git and exit.
 585
 586--info-path::
 587        Print the path where the Info files documenting this
 588        version of Git are installed and exit.
 589
 590-p::
 591--paginate::
 592        Pipe all output into 'less' (or if set, $PAGER) if standard
 593        output is a terminal.  This overrides the `pager.<cmd>`
 594        configuration options (see the "Configuration Mechanism" section
 595        below).
 596
 597--no-pager::
 598        Do not pipe Git output into a pager.
 599
 600--git-dir=<path>::
 601        Set the path to the repository. This can also be controlled by
 602        setting the `GIT_DIR` environment variable. It can be an absolute
 603        path or relative path to current working directory.
 604
 605--work-tree=<path>::
 606        Set the path to the working tree. It can be an absolute path
 607        or a path relative to the current working directory.
 608        This can also be controlled by setting the GIT_WORK_TREE
 609        environment variable and the core.worktree configuration
 610        variable (see core.worktree in linkgit:git-config[1] for a
 611        more detailed discussion).
 612
 613--namespace=<path>::
 614        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 615        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 616        variable.
 617
 618--super-prefix=<path>::
 619        Currently for internal use only.  Set a prefix which gives a path from
 620        above a repository down to its root.  One use is to give submodules
 621        context about the superproject that invoked it.
 622
 623--bare::
 624        Treat the repository as a bare repository.  If GIT_DIR
 625        environment is not set, it is set to the current working
 626        directory.
 627
 628--no-replace-objects::
 629        Do not use replacement refs to replace Git objects. See
 630        linkgit:git-replace[1] for more information.
 631
 632--literal-pathspecs::
 633        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 634        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 635        variable to `1`.
 636
 637--glob-pathspecs::
 638        Add "glob" magic to all pathspec. This is equivalent to setting
 639        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 640        globbing on individual pathspecs can be done using pathspec
 641        magic ":(literal)"
 642
 643--noglob-pathspecs::
 644        Add "literal" magic to all pathspec. This is equivalent to setting
 645        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 646        globbing on individual pathspecs can be done using pathspec
 647        magic ":(glob)"
 648
 649--icase-pathspecs::
 650        Add "icase" magic to all pathspec. This is equivalent to setting
 651        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 652
 653GIT COMMANDS
 654------------
 655
 656We divide Git into high level ("porcelain") commands and low level
 657("plumbing") commands.
 658
 659High-level commands (porcelain)
 660-------------------------------
 661
 662We separate the porcelain commands into the main commands and some
 663ancillary user utilities.
 664
 665Main porcelain commands
 666~~~~~~~~~~~~~~~~~~~~~~~
 667
 668include::cmds-mainporcelain.txt[]
 669
 670Ancillary Commands
 671~~~~~~~~~~~~~~~~~~
 672Manipulators:
 673
 674include::cmds-ancillarymanipulators.txt[]
 675
 676Interrogators:
 677
 678include::cmds-ancillaryinterrogators.txt[]
 679
 680
 681Interacting with Others
 682~~~~~~~~~~~~~~~~~~~~~~~
 683
 684These commands are to interact with foreign SCM and with other
 685people via patch over e-mail.
 686
 687include::cmds-foreignscminterface.txt[]
 688
 689
 690Low-level commands (plumbing)
 691-----------------------------
 692
 693Although Git includes its
 694own porcelain layer, its low-level commands are sufficient to support
 695development of alternative porcelains.  Developers of such porcelains
 696might start by reading about linkgit:git-update-index[1] and
 697linkgit:git-read-tree[1].
 698
 699The interface (input, output, set of options and the semantics)
 700to these low-level commands are meant to be a lot more stable
 701than Porcelain level commands, because these commands are
 702primarily for scripted use.  The interface to Porcelain commands
 703on the other hand are subject to change in order to improve the
 704end user experience.
 705
 706The following description divides
 707the low-level commands into commands that manipulate objects (in
 708the repository, index, and working tree), commands that interrogate and
 709compare objects, and commands that move objects and references between
 710repositories.
 711
 712
 713Manipulation commands
 714~~~~~~~~~~~~~~~~~~~~~
 715
 716include::cmds-plumbingmanipulators.txt[]
 717
 718
 719Interrogation commands
 720~~~~~~~~~~~~~~~~~~~~~~
 721
 722include::cmds-plumbinginterrogators.txt[]
 723
 724In general, the interrogate commands do not touch the files in
 725the working tree.
 726
 727
 728Synching repositories
 729~~~~~~~~~~~~~~~~~~~~~
 730
 731include::cmds-synchingrepositories.txt[]
 732
 733The following are helper commands used by the above; end users
 734typically do not use them directly.
 735
 736include::cmds-synchelpers.txt[]
 737
 738
 739Internal helper commands
 740~~~~~~~~~~~~~~~~~~~~~~~~
 741
 742These are internal helper commands used by other commands; end
 743users typically do not use them directly.
 744
 745include::cmds-purehelpers.txt[]
 746
 747
 748Configuration Mechanism
 749-----------------------
 750
 751Git uses a simple text format to store customizations that are per
 752repository and are per user.  Such a configuration file may look
 753like this:
 754
 755------------
 756#
 757# A '#' or ';' character indicates a comment.
 758#
 759
 760; core variables
 761[core]
 762        ; Don't trust file modes
 763        filemode = false
 764
 765; user identity
 766[user]
 767        name = "Junio C Hamano"
 768        email = "gitster@pobox.com"
 769
 770------------
 771
 772Various commands read from the configuration file and adjust
 773their operation accordingly.  See linkgit:git-config[1] for a
 774list and more details about the configuration mechanism.
 775
 776
 777Identifier Terminology
 778----------------------
 779<object>::
 780        Indicates the object name for any type of object.
 781
 782<blob>::
 783        Indicates a blob object name.
 784
 785<tree>::
 786        Indicates a tree object name.
 787
 788<commit>::
 789        Indicates a commit object name.
 790
 791<tree-ish>::
 792        Indicates a tree, commit or tag object name.  A
 793        command that takes a <tree-ish> argument ultimately wants to
 794        operate on a <tree> object but automatically dereferences
 795        <commit> and <tag> objects that point at a <tree>.
 796
 797<commit-ish>::
 798        Indicates a commit or tag object name.  A
 799        command that takes a <commit-ish> argument ultimately wants to
 800        operate on a <commit> object but automatically dereferences
 801        <tag> objects that point at a <commit>.
 802
 803<type>::
 804        Indicates that an object type is required.
 805        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 806
 807<file>::
 808        Indicates a filename - almost always relative to the
 809        root of the tree structure `GIT_INDEX_FILE` describes.
 810
 811Symbolic Identifiers
 812--------------------
 813Any Git command accepting any <object> can also use the following
 814symbolic notation:
 815
 816HEAD::
 817        indicates the head of the current branch.
 818
 819<tag>::
 820        a valid tag 'name'
 821        (i.e. a `refs/tags/<tag>` reference).
 822
 823<head>::
 824        a valid head 'name'
 825        (i.e. a `refs/heads/<head>` reference).
 826
 827For a more complete list of ways to spell object names, see
 828"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 829
 830
 831File/Directory Structure
 832------------------------
 833
 834Please see the linkgit:gitrepository-layout[5] document.
 835
 836Read linkgit:githooks[5] for more details about each hook.
 837
 838Higher level SCMs may provide and manage additional information in the
 839`$GIT_DIR`.
 840
 841
 842Terminology
 843-----------
 844Please see linkgit:gitglossary[7].
 845
 846
 847Environment Variables
 848---------------------
 849Various Git commands use the following environment variables:
 850
 851The Git Repository
 852~~~~~~~~~~~~~~~~~~
 853These environment variables apply to 'all' core Git commands. Nb: it
 854is worth noting that they may be used/overridden by SCMS sitting above
 855Git so take care if using a foreign front-end.
 856
 857`GIT_INDEX_FILE`::
 858        This environment allows the specification of an alternate
 859        index file. If not specified, the default of `$GIT_DIR/index`
 860        is used.
 861
 862`GIT_INDEX_VERSION`::
 863        This environment variable allows the specification of an index
 864        version for new repositories.  It won't affect existing index
 865        files.  By default index file version 2 or 3 is used. See
 866        linkgit:git-update-index[1] for more information.
 867
 868`GIT_OBJECT_DIRECTORY`::
 869        If the object storage directory is specified via this
 870        environment variable then the sha1 directories are created
 871        underneath - otherwise the default `$GIT_DIR/objects`
 872        directory is used.
 873
 874`GIT_ALTERNATE_OBJECT_DIRECTORIES`::
 875        Due to the immutable nature of Git objects, old objects can be
 876        archived into shared, read-only directories. This variable
 877        specifies a ":" separated (on Windows ";" separated) list
 878        of Git object directories which can be used to search for Git
 879        objects. New objects will not be written to these directories.
 880+
 881        Entries that begin with `"` (double-quote) will be interpreted
 882        as C-style quoted paths, removing leading and trailing
 883        double-quotes and respecting backslash escapes. E.g., the value
 884        `"path-with-\"-and-:-in-it":vanilla-path` has two paths:
 885        `path-with-"-and-:-in-it` and `vanilla-path`.
 886
 887`GIT_DIR`::
 888        If the `GIT_DIR` environment variable is set then it
 889        specifies a path to use instead of the default `.git`
 890        for the base of the repository.
 891        The `--git-dir` command-line option also sets this value.
 892
 893`GIT_WORK_TREE`::
 894        Set the path to the root of the working tree.
 895        This can also be controlled by the `--work-tree` command-line
 896        option and the core.worktree configuration variable.
 897
 898`GIT_NAMESPACE`::
 899        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 900        The `--namespace` command-line option also sets this value.
 901
 902`GIT_CEILING_DIRECTORIES`::
 903        This should be a colon-separated list of absolute paths.  If
 904        set, it is a list of directories that Git should not chdir up
 905        into while looking for a repository directory (useful for
 906        excluding slow-loading network directories).  It will not
 907        exclude the current working directory or a GIT_DIR set on the
 908        command line or in the environment.  Normally, Git has to read
 909        the entries in this list and resolve any symlink that
 910        might be present in order to compare them with the current
 911        directory.  However, if even this access is slow, you
 912        can add an empty entry to the list to tell Git that the
 913        subsequent entries are not symlinks and needn't be resolved;
 914        e.g.,
 915        `GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink`.
 916
 917`GIT_DISCOVERY_ACROSS_FILESYSTEM`::
 918        When run in a directory that does not have ".git" repository
 919        directory, Git tries to find such a directory in the parent
 920        directories to find the top of the working tree, but by default it
 921        does not cross filesystem boundaries.  This environment variable
 922        can be set to true to tell Git not to stop at filesystem
 923        boundaries.  Like `GIT_CEILING_DIRECTORIES`, this will not affect
 924        an explicit repository directory set via `GIT_DIR` or on the
 925        command line.
 926
 927`GIT_COMMON_DIR`::
 928        If this variable is set to a path, non-worktree files that are
 929        normally in $GIT_DIR will be taken from this path
 930        instead. Worktree-specific files such as HEAD or index are
 931        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 932        linkgit:git-worktree[1] for
 933        details. This variable has lower precedence than other path
 934        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 935
 936Git Commits
 937~~~~~~~~~~~
 938`GIT_AUTHOR_NAME`::
 939`GIT_AUTHOR_EMAIL`::
 940`GIT_AUTHOR_DATE`::
 941`GIT_COMMITTER_NAME`::
 942`GIT_COMMITTER_EMAIL`::
 943`GIT_COMMITTER_DATE`::
 944'EMAIL'::
 945        see linkgit:git-commit-tree[1]
 946
 947Git Diffs
 948~~~~~~~~~
 949`GIT_DIFF_OPTS`::
 950        Only valid setting is "--unified=??" or "-u??" to set the
 951        number of context lines shown when a unified diff is created.
 952        This takes precedence over any "-U" or "--unified" option
 953        value passed on the Git diff command line.
 954
 955`GIT_EXTERNAL_DIFF`::
 956        When the environment variable `GIT_EXTERNAL_DIFF` is set, the
 957        program named by it is called, instead of the diff invocation
 958        described above.  For a path that is added, removed, or modified,
 959        `GIT_EXTERNAL_DIFF` is called with 7 parameters:
 960
 961        path old-file old-hex old-mode new-file new-hex new-mode
 962+
 963where:
 964
 965        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 966                         contents of <old|new>,
 967        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 968        <old|new>-mode:: are the octal representation of the file modes.
 969+
 970The file parameters can point at the user's working file
 971(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 972when a new file is added), or a temporary file (e.g. `old-file` in the
 973index).  `GIT_EXTERNAL_DIFF` should not worry about unlinking the
 974temporary file --- it is removed when `GIT_EXTERNAL_DIFF` exits.
 975+
 976For a path that is unmerged, `GIT_EXTERNAL_DIFF` is called with 1
 977parameter, <path>.
 978+
 979For each path `GIT_EXTERNAL_DIFF` is called, two environment variables,
 980`GIT_DIFF_PATH_COUNTER` and `GIT_DIFF_PATH_TOTAL` are set.
 981
 982`GIT_DIFF_PATH_COUNTER`::
 983        A 1-based counter incremented by one for every path.
 984
 985`GIT_DIFF_PATH_TOTAL`::
 986        The total number of paths.
 987
 988other
 989~~~~~
 990`GIT_MERGE_VERBOSITY`::
 991        A number controlling the amount of output shown by
 992        the recursive merge strategy.  Overrides merge.verbosity.
 993        See linkgit:git-merge[1]
 994
 995`GIT_PAGER`::
 996        This environment variable overrides `$PAGER`. If it is set
 997        to an empty string or to the value "cat", Git will not launch
 998        a pager.  See also the `core.pager` option in
 999        linkgit:git-config[1].
1000
1001`GIT_EDITOR`::
1002        This environment variable overrides `$EDITOR` and `$VISUAL`.
1003        It is used by several Git commands when, on interactive mode,
1004        an editor is to be launched. See also linkgit:git-var[1]
1005        and the `core.editor` option in linkgit:git-config[1].
1006
1007`GIT_SSH`::
1008`GIT_SSH_COMMAND`::
1009        If either of these environment variables is set then 'git fetch'
1010        and 'git push' will use the specified command instead of 'ssh'
1011        when they need to connect to a remote system.
1012        The command will be given exactly two or four arguments: the
1013        'username@host' (or just 'host') from the URL and the shell
1014        command to execute on that remote system, optionally preceded by
1015        `-p` (literally) and the 'port' from the URL when it specifies
1016        something other than the default SSH port.
1017+
1018`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
1019by the shell, which allows additional arguments to be included.
1020`$GIT_SSH` on the other hand must be just the path to a program
1021(which can be a wrapper shell script, if additional arguments are
1022needed).
1023+
1024Usually it is easier to configure any desired options through your
1025personal `.ssh/config` file.  Please consult your ssh documentation
1026for further details.
1027
1028`GIT_SSH_VARIANT`::
1029        If this environment variable is set, it overrides Git's autodetection
1030        whether `GIT_SSH`/`GIT_SSH_COMMAND`/`core.sshCommand` refer to OpenSSH,
1031        plink or tortoiseplink. This variable overrides the config setting
1032        `ssh.variant` that serves the same purpose.
1033
1034`GIT_ASKPASS`::
1035        If this environment variable is set, then Git commands which need to
1036        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
1037        will call this program with a suitable prompt as command-line argument
1038        and read the password from its STDOUT. See also the `core.askPass`
1039        option in linkgit:git-config[1].
1040
1041`GIT_TERMINAL_PROMPT`::
1042        If this environment variable is set to `0`, git will not prompt
1043        on the terminal (e.g., when asking for HTTP authentication).
1044
1045`GIT_CONFIG_NOSYSTEM`::
1046        Whether to skip reading settings from the system-wide
1047        `$(prefix)/etc/gitconfig` file.  This environment variable can
1048        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
1049        predictable environment for a picky script, or you can set it
1050        temporarily to avoid using a buggy `/etc/gitconfig` file while
1051        waiting for someone with sufficient permissions to fix it.
1052
1053`GIT_FLUSH`::
1054        If this environment variable is set to "1", then commands such
1055        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
1056        'git check-attr' and 'git check-ignore' will
1057        force a flush of the output stream after each record have been
1058        flushed. If this
1059        variable is set to "0", the output of these commands will be done
1060        using completely buffered I/O.   If this environment variable is
1061        not set, Git will choose buffered or record-oriented flushing
1062        based on whether stdout appears to be redirected to a file or not.
1063
1064`GIT_TRACE`::
1065        Enables general trace messages, e.g. alias expansion, built-in
1066        command execution and external command execution.
1067+
1068If this variable is set to "1", "2" or "true" (comparison
1069is case insensitive), trace messages will be printed to
1070stderr.
1071+
1072If the variable is set to an integer value greater than 2
1073and lower than 10 (strictly) then Git will interpret this
1074value as an open file descriptor and will try to write the
1075trace messages into this file descriptor.
1076+
1077Alternatively, if the variable is set to an absolute path
1078(starting with a '/' character), Git will interpret this
1079as a file path and will try to write the trace messages
1080into it.
1081+
1082Unsetting the variable, or setting it to empty, "0" or
1083"false" (case insensitive) disables trace messages.
1084
1085`GIT_TRACE_PACK_ACCESS`::
1086        Enables trace messages for all accesses to any packs. For each
1087        access, the pack file name and an offset in the pack is
1088        recorded. This may be helpful for troubleshooting some
1089        pack-related performance problems.
1090        See `GIT_TRACE` for available trace output options.
1091
1092`GIT_TRACE_PACKET`::
1093        Enables trace messages for all packets coming in or out of a
1094        given program. This can help with debugging object negotiation
1095        or other protocol issues. Tracing is turned off at a packet
1096        starting with "PACK" (but see `GIT_TRACE_PACKFILE` below).
1097        See `GIT_TRACE` for available trace output options.
1098
1099`GIT_TRACE_PACKFILE`::
1100        Enables tracing of packfiles sent or received by a
1101        given program. Unlike other trace output, this trace is
1102        verbatim: no headers, and no quoting of binary data. You almost
1103        certainly want to direct into a file (e.g.,
1104        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1105        the terminal or mixing it with other trace output.
1106+
1107Note that this is currently only implemented for the client side
1108of clones and fetches.
1109
1110`GIT_TRACE_PERFORMANCE`::
1111        Enables performance related trace messages, e.g. total execution
1112        time of each Git command.
1113        See `GIT_TRACE` for available trace output options.
1114
1115`GIT_TRACE_SETUP`::
1116        Enables trace messages printing the .git, working tree and current
1117        working directory after Git has completed its setup phase.
1118        See `GIT_TRACE` for available trace output options.
1119
1120`GIT_TRACE_SHALLOW`::
1121        Enables trace messages that can help debugging fetching /
1122        cloning of shallow repositories.
1123        See `GIT_TRACE` for available trace output options.
1124
1125`GIT_TRACE_CURL`::
1126        Enables a curl full trace dump of all incoming and outgoing data,
1127        including descriptive information, of the git transport protocol.
1128        This is similar to doing curl `--trace-ascii` on the command line.
1129        This option overrides setting the `GIT_CURL_VERBOSE` environment
1130        variable.
1131        See `GIT_TRACE` for available trace output options.
1132
1133`GIT_LITERAL_PATHSPECS`::
1134        Setting this variable to `1` will cause Git to treat all
1135        pathspecs literally, rather than as glob patterns. For example,
1136        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1137        for commits that touch the path `*.c`, not any paths that the
1138        glob `*.c` matches. You might want this if you are feeding
1139        literal paths to Git (e.g., paths previously given to you by
1140        `git ls-tree`, `--raw` diff output, etc).
1141
1142`GIT_GLOB_PATHSPECS`::
1143        Setting this variable to `1` will cause Git to treat all
1144        pathspecs as glob patterns (aka "glob" magic).
1145
1146`GIT_NOGLOB_PATHSPECS`::
1147        Setting this variable to `1` will cause Git to treat all
1148        pathspecs as literal (aka "literal" magic).
1149
1150`GIT_ICASE_PATHSPECS`::
1151        Setting this variable to `1` will cause Git to treat all
1152        pathspecs as case-insensitive.
1153
1154`GIT_REFLOG_ACTION`::
1155        When a ref is updated, reflog entries are created to keep
1156        track of the reason why the ref was updated (which is
1157        typically the name of the high-level command that updated
1158        the ref), in addition to the old and new values of the ref.
1159        A scripted Porcelain command can use set_reflog_action
1160        helper function in `git-sh-setup` to set its name to this
1161        variable when it is invoked as the top level command by the
1162        end user, to be recorded in the body of the reflog.
1163
1164`GIT_REF_PARANOIA`::
1165        If set to `1`, include broken or badly named refs when iterating
1166        over lists of refs. In a normal, non-corrupted repository, this
1167        does nothing. However, enabling it may help git to detect and
1168        abort some operations in the presence of broken refs. Git sets
1169        this variable automatically when performing destructive
1170        operations like linkgit:git-prune[1]. You should not need to set
1171        it yourself unless you want to be paranoid about making sure
1172        an operation has touched every ref (e.g., because you are
1173        cloning a repository to make a backup).
1174
1175`GIT_ALLOW_PROTOCOL`::
1176        If set to a colon-separated list of protocols, behave as if
1177        `protocol.allow` is set to `never`, and each of the listed
1178        protocols has `protocol.<name>.allow` set to `always`
1179        (overriding any existing configuration). In other words, any
1180        protocol not mentioned will be disallowed (i.e., this is a
1181        whitelist, not a blacklist). See the description of
1182        `protocol.allow` in linkgit:git-config[1] for more details.
1183
1184`GIT_PROTOCOL_FROM_USER`::
1185        Set to 0 to prevent protocols used by fetch/push/clone which are
1186        configured to the `user` state.  This is useful to restrict recursive
1187        submodule initialization from an untrusted repository or for programs
1188        which feed potentially-untrusted URLS to git commands.  See
1189        linkgit:git-config[1] for more details.
1190
1191Discussion[[Discussion]]
1192------------------------
1193
1194More detail on the following is available from the
1195link:user-manual.html#git-concepts[Git concepts chapter of the
1196user-manual] and linkgit:gitcore-tutorial[7].
1197
1198A Git project normally consists of a working directory with a ".git"
1199subdirectory at the top level.  The .git directory contains, among other
1200things, a compressed object database representing the complete history
1201of the project, an "index" file which links that history to the current
1202contents of the working tree, and named pointers into that history such
1203as tags and branch heads.
1204
1205The object database contains objects of three main types: blobs, which
1206hold file data; trees, which point to blobs and other trees to build up
1207directory hierarchies; and commits, which each reference a single tree
1208and some number of parent commits.
1209
1210The commit, equivalent to what other systems call a "changeset" or
1211"version", represents a step in the project's history, and each parent
1212represents an immediately preceding step.  Commits with more than one
1213parent represent merges of independent lines of development.
1214
1215All objects are named by the SHA-1 hash of their contents, normally
1216written as a string of 40 hex digits.  Such names are globally unique.
1217The entire history leading up to a commit can be vouched for by signing
1218just that commit.  A fourth object type, the tag, is provided for this
1219purpose.
1220
1221When first created, objects are stored in individual files, but for
1222efficiency may later be compressed together into "pack files".
1223
1224Named pointers called refs mark interesting points in history.  A ref
1225may contain the SHA-1 name of an object or the name of another ref.  Refs
1226with names beginning `ref/head/` contain the SHA-1 name of the most
1227recent commit (or "head") of a branch under development.  SHA-1 names of
1228tags of interest are stored under `ref/tags/`.  A special ref named
1229`HEAD` contains the name of the currently checked-out branch.
1230
1231The index file is initialized with a list of all paths and, for each
1232path, a blob object and a set of attributes.  The blob object represents
1233the contents of the file as of the head of the current branch.  The
1234attributes (last modified time, size, etc.) are taken from the
1235corresponding file in the working tree.  Subsequent changes to the
1236working tree can be found by comparing these attributes.  The index may
1237be updated with new content, and new commits may be created from the
1238content stored in the index.
1239
1240The index is also capable of storing multiple entries (called "stages")
1241for a given pathname.  These stages are used to hold the various
1242unmerged version of a file when a merge is in progress.
1243
1244FURTHER DOCUMENTATION
1245---------------------
1246
1247See the references in the "description" section to get started
1248using Git.  The following is probably more detail than necessary
1249for a first-time user.
1250
1251The link:user-manual.html#git-concepts[Git concepts chapter of the
1252user-manual] and linkgit:gitcore-tutorial[7] both provide
1253introductions to the underlying Git architecture.
1254
1255See linkgit:gitworkflows[7] for an overview of recommended workflows.
1256
1257See also the link:howto-index.html[howto] documents for some useful
1258examples.
1259
1260The internals are documented in the
1261link:technical/api-index.html[Git API documentation].
1262
1263Users migrating from CVS may also want to
1264read linkgit:gitcvs-migration[7].
1265
1266
1267Authors
1268-------
1269Git was started by Linus Torvalds, and is currently maintained by Junio
1270C Hamano. Numerous contributions have come from the Git mailing list
1271<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1272gives you a more complete list of contributors.
1273
1274If you have a clone of git.git itself, the
1275output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1276the authors for specific parts of the project.
1277
1278Reporting Bugs
1279--------------
1280
1281Report bugs to the Git mailing list <git@vger.kernel.org> where the
1282development and maintenance is primarily done.  You do not have to be
1283subscribed to the list to send a message there.
1284
1285SEE ALSO
1286--------
1287linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1288linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1289linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1290linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1291linkgit:gitworkflows[7]
1292
1293GIT
1294---
1295Part of the linkgit:git[1] suite