Documentation / git.txton commit Merge branch 'ak/git-strip-extension-from-dashed-command' into maint (08e21c9)
   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:v2.7.2/git.html[documentation for release 2.7.2]
  47
  48* release notes for
  49  link:RelNotes/2.7.2.txt[2.7.2],
  50  link:RelNotes/2.7.1.txt[2.7.1],
  51  link:RelNotes/2.7.0.txt[2.7].
  52
  53* link:v2.6.5/git.html[documentation for release 2.6.5]
  54
  55* release notes for
  56  link:RelNotes/2.6.5.txt[2.6.5],
  57  link:RelNotes/2.6.4.txt[2.6.4],
  58  link:RelNotes/2.6.3.txt[2.6.3],
  59  link:RelNotes/2.6.2.txt[2.6.2],
  60  link:RelNotes/2.6.1.txt[2.6.1],
  61  link:RelNotes/2.6.0.txt[2.6].
  62
  63* link:v2.5.4/git.html[documentation for release 2.5.4]
  64
  65* release notes for
  66  link:RelNotes/2.5.4.txt[2.5.4],
  67  link:RelNotes/2.5.3.txt[2.5.3],
  68  link:RelNotes/2.5.2.txt[2.5.2],
  69  link:RelNotes/2.5.1.txt[2.5.1],
  70  link:RelNotes/2.5.0.txt[2.5].
  71
  72* link:v2.4.10/git.html[documentation for release 2.4.10]
  73
  74* release notes for
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  76  link:RelNotes/2.4.9.txt[2.4.9],
  77  link:RelNotes/2.4.8.txt[2.4.8],
  78  link:RelNotes/2.4.7.txt[2.4.7],
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  80  link:RelNotes/2.4.5.txt[2.4.5],
  81  link:RelNotes/2.4.4.txt[2.4.4],
  82  link:RelNotes/2.4.3.txt[2.4.3],
  83  link:RelNotes/2.4.2.txt[2.4.2],
  84  link:RelNotes/2.4.1.txt[2.4.1],
  85  link:RelNotes/2.4.0.txt[2.4].
  86
  87* link:v2.3.10/git.html[documentation for release 2.3.10]
  88
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 427* release notes for
 428  link:RelNotes/1.5.4.7.txt[1.5.4.7],
 429  link:RelNotes/1.5.4.6.txt[1.5.4.6],
 430  link:RelNotes/1.5.4.5.txt[1.5.4.5],
 431  link:RelNotes/1.5.4.4.txt[1.5.4.4],
 432  link:RelNotes/1.5.4.3.txt[1.5.4.3],
 433  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 434  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 435  link:RelNotes/1.5.4.txt[1.5.4].
 436
 437* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 438
 439* release notes for
 440  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 441  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 442  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 443  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 444  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 445  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 446  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 447  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 448  link:RelNotes/1.5.3.txt[1.5.3].
 449
 450* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 451
 452* release notes for
 453  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 454  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 455  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 456  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 457  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 458  link:RelNotes/1.5.2.txt[1.5.2].
 459
 460* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 461
 462* release notes for
 463  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 464  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 465  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 466  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 467  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 468  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 469  link:RelNotes/1.5.1.txt[1.5.1].
 470
 471* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 472
 473* release notes for
 474  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 475  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 476  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 477  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 478  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 479  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 480  link:RelNotes/1.5.0.txt[1.5.0].
 481
 482* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 483  link:v1.3.3/git.html[1.3.3],
 484  link:v1.2.6/git.html[1.2.6],
 485  link:v1.0.13/git.html[1.0.13].
 486
 487============
 488
 489endif::stalenotes[]
 490
 491OPTIONS
 492-------
 493--version::
 494        Prints the Git suite version that the 'git' program came from.
 495
 496--help::
 497        Prints the synopsis and a list of the most commonly used
 498        commands. If the option '--all' or '-a' is given then all
 499        available commands are printed. If a Git command is named this
 500        option will bring up the manual page for that command.
 501+
 502Other options are available to control how the manual page is
 503displayed. See linkgit:git-help[1] for more information,
 504because `git --help ...` is converted internally into `git
 505help ...`.
 506
 507-C <path>::
 508        Run as if git was started in '<path>' instead of the current working
 509        directory.  When multiple `-C` options are given, each subsequent
 510        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 511        <path>`.
 512+
 513This option affects options that expect path name like `--git-dir` and
 514`--work-tree` in that their interpretations of the path names would be
 515made relative to the working directory caused by the `-C` option. For
 516example the following invocations are equivalent:
 517
 518    git --git-dir=a.git --work-tree=b -C c status
 519    git --git-dir=c/a.git --work-tree=c/b status
 520
 521-c <name>=<value>::
 522        Pass a configuration parameter to the command. The value
 523        given will override values from configuration files.
 524        The <name> is expected in the same format as listed by
 525        'git config' (subkeys separated by dots).
 526+
 527Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 528`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 529config file). Including the equals but with an empty value (like `git -c
 530foo.bar= ...`) sets `foo.bar` to the empty string.
 531
 532--exec-path[=<path>]::
 533        Path to wherever your core Git programs are installed.
 534        This can also be controlled by setting the GIT_EXEC_PATH
 535        environment variable. If no path is given, 'git' will print
 536        the current setting and then exit.
 537
 538--html-path::
 539        Print the path, without trailing slash, where Git's HTML
 540        documentation is installed and exit.
 541
 542--man-path::
 543        Print the manpath (see `man(1)`) for the man pages for
 544        this version of Git and exit.
 545
 546--info-path::
 547        Print the path where the Info files documenting this
 548        version of Git are installed and exit.
 549
 550-p::
 551--paginate::
 552        Pipe all output into 'less' (or if set, $PAGER) if standard
 553        output is a terminal.  This overrides the `pager.<cmd>`
 554        configuration options (see the "Configuration Mechanism" section
 555        below).
 556
 557--no-pager::
 558        Do not pipe Git output into a pager.
 559
 560--git-dir=<path>::
 561        Set the path to the repository. This can also be controlled by
 562        setting the GIT_DIR environment variable. It can be an absolute
 563        path or relative path to current working directory.
 564
 565--work-tree=<path>::
 566        Set the path to the working tree. It can be an absolute path
 567        or a path relative to the current working directory.
 568        This can also be controlled by setting the GIT_WORK_TREE
 569        environment variable and the core.worktree configuration
 570        variable (see core.worktree in linkgit:git-config[1] for a
 571        more detailed discussion).
 572
 573--namespace=<path>::
 574        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 575        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 576        variable.
 577
 578--bare::
 579        Treat the repository as a bare repository.  If GIT_DIR
 580        environment is not set, it is set to the current working
 581        directory.
 582
 583--no-replace-objects::
 584        Do not use replacement refs to replace Git objects. See
 585        linkgit:git-replace[1] for more information.
 586
 587--literal-pathspecs::
 588        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 589        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 590        variable to `1`.
 591
 592--glob-pathspecs::
 593        Add "glob" magic to all pathspec. This is equivalent to setting
 594        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 595        globbing on individual pathspecs can be done using pathspec
 596        magic ":(literal)"
 597
 598--noglob-pathspecs::
 599        Add "literal" magic to all pathspec. This is equivalent to setting
 600        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 601        globbing on individual pathspecs can be done using pathspec
 602        magic ":(glob)"
 603
 604--icase-pathspecs::
 605        Add "icase" magic to all pathspec. This is equivalent to setting
 606        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 607
 608GIT COMMANDS
 609------------
 610
 611We divide Git into high level ("porcelain") commands and low level
 612("plumbing") commands.
 613
 614High-level commands (porcelain)
 615-------------------------------
 616
 617We separate the porcelain commands into the main commands and some
 618ancillary user utilities.
 619
 620Main porcelain commands
 621~~~~~~~~~~~~~~~~~~~~~~~
 622
 623include::cmds-mainporcelain.txt[]
 624
 625Ancillary Commands
 626~~~~~~~~~~~~~~~~~~
 627Manipulators:
 628
 629include::cmds-ancillarymanipulators.txt[]
 630
 631Interrogators:
 632
 633include::cmds-ancillaryinterrogators.txt[]
 634
 635
 636Interacting with Others
 637~~~~~~~~~~~~~~~~~~~~~~~
 638
 639These commands are to interact with foreign SCM and with other
 640people via patch over e-mail.
 641
 642include::cmds-foreignscminterface.txt[]
 643
 644
 645Low-level commands (plumbing)
 646-----------------------------
 647
 648Although Git includes its
 649own porcelain layer, its low-level commands are sufficient to support
 650development of alternative porcelains.  Developers of such porcelains
 651might start by reading about linkgit:git-update-index[1] and
 652linkgit:git-read-tree[1].
 653
 654The interface (input, output, set of options and the semantics)
 655to these low-level commands are meant to be a lot more stable
 656than Porcelain level commands, because these commands are
 657primarily for scripted use.  The interface to Porcelain commands
 658on the other hand are subject to change in order to improve the
 659end user experience.
 660
 661The following description divides
 662the low-level commands into commands that manipulate objects (in
 663the repository, index, and working tree), commands that interrogate and
 664compare objects, and commands that move objects and references between
 665repositories.
 666
 667
 668Manipulation commands
 669~~~~~~~~~~~~~~~~~~~~~
 670
 671include::cmds-plumbingmanipulators.txt[]
 672
 673
 674Interrogation commands
 675~~~~~~~~~~~~~~~~~~~~~~
 676
 677include::cmds-plumbinginterrogators.txt[]
 678
 679In general, the interrogate commands do not touch the files in
 680the working tree.
 681
 682
 683Synching repositories
 684~~~~~~~~~~~~~~~~~~~~~
 685
 686include::cmds-synchingrepositories.txt[]
 687
 688The following are helper commands used by the above; end users
 689typically do not use them directly.
 690
 691include::cmds-synchelpers.txt[]
 692
 693
 694Internal helper commands
 695~~~~~~~~~~~~~~~~~~~~~~~~
 696
 697These are internal helper commands used by other commands; end
 698users typically do not use them directly.
 699
 700include::cmds-purehelpers.txt[]
 701
 702
 703Configuration Mechanism
 704-----------------------
 705
 706Git uses a simple text format to store customizations that are per
 707repository and are per user.  Such a configuration file may look
 708like this:
 709
 710------------
 711#
 712# A '#' or ';' character indicates a comment.
 713#
 714
 715; core variables
 716[core]
 717        ; Don't trust file modes
 718        filemode = false
 719
 720; user identity
 721[user]
 722        name = "Junio C Hamano"
 723        email = "gitster@pobox.com"
 724
 725------------
 726
 727Various commands read from the configuration file and adjust
 728their operation accordingly.  See linkgit:git-config[1] for a
 729list and more details about the configuration mechanism.
 730
 731
 732Identifier Terminology
 733----------------------
 734<object>::
 735        Indicates the object name for any type of object.
 736
 737<blob>::
 738        Indicates a blob object name.
 739
 740<tree>::
 741        Indicates a tree object name.
 742
 743<commit>::
 744        Indicates a commit object name.
 745
 746<tree-ish>::
 747        Indicates a tree, commit or tag object name.  A
 748        command that takes a <tree-ish> argument ultimately wants to
 749        operate on a <tree> object but automatically dereferences
 750        <commit> and <tag> objects that point at a <tree>.
 751
 752<commit-ish>::
 753        Indicates a commit or tag object name.  A
 754        command that takes a <commit-ish> argument ultimately wants to
 755        operate on a <commit> object but automatically dereferences
 756        <tag> objects that point at a <commit>.
 757
 758<type>::
 759        Indicates that an object type is required.
 760        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 761
 762<file>::
 763        Indicates a filename - almost always relative to the
 764        root of the tree structure `GIT_INDEX_FILE` describes.
 765
 766Symbolic Identifiers
 767--------------------
 768Any Git command accepting any <object> can also use the following
 769symbolic notation:
 770
 771HEAD::
 772        indicates the head of the current branch.
 773
 774<tag>::
 775        a valid tag 'name'
 776        (i.e. a `refs/tags/<tag>` reference).
 777
 778<head>::
 779        a valid head 'name'
 780        (i.e. a `refs/heads/<head>` reference).
 781
 782For a more complete list of ways to spell object names, see
 783"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 784
 785
 786File/Directory Structure
 787------------------------
 788
 789Please see the linkgit:gitrepository-layout[5] document.
 790
 791Read linkgit:githooks[5] for more details about each hook.
 792
 793Higher level SCMs may provide and manage additional information in the
 794`$GIT_DIR`.
 795
 796
 797Terminology
 798-----------
 799Please see linkgit:gitglossary[7].
 800
 801
 802Environment Variables
 803---------------------
 804Various Git commands use the following environment variables:
 805
 806The Git Repository
 807~~~~~~~~~~~~~~~~~~
 808These environment variables apply to 'all' core Git commands. Nb: it
 809is worth noting that they may be used/overridden by SCMS sitting above
 810Git so take care if using a foreign front-end.
 811
 812'GIT_INDEX_FILE'::
 813        This environment allows the specification of an alternate
 814        index file. If not specified, the default of `$GIT_DIR/index`
 815        is used.
 816
 817'GIT_INDEX_VERSION'::
 818        This environment variable allows the specification of an index
 819        version for new repositories.  It won't affect existing index
 820        files.  By default index file version 2 or 3 is used. See
 821        linkgit:git-update-index[1] for more information.
 822
 823'GIT_OBJECT_DIRECTORY'::
 824        If the object storage directory is specified via this
 825        environment variable then the sha1 directories are created
 826        underneath - otherwise the default `$GIT_DIR/objects`
 827        directory is used.
 828
 829'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
 830        Due to the immutable nature of Git objects, old objects can be
 831        archived into shared, read-only directories. This variable
 832        specifies a ":" separated (on Windows ";" separated) list
 833        of Git object directories which can be used to search for Git
 834        objects. New objects will not be written to these directories.
 835
 836'GIT_DIR'::
 837        If the 'GIT_DIR' environment variable is set then it
 838        specifies a path to use instead of the default `.git`
 839        for the base of the repository.
 840        The '--git-dir' command-line option also sets this value.
 841
 842'GIT_WORK_TREE'::
 843        Set the path to the root of the working tree.
 844        This can also be controlled by the '--work-tree' command-line
 845        option and the core.worktree configuration variable.
 846
 847'GIT_NAMESPACE'::
 848        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 849        The '--namespace' command-line option also sets this value.
 850
 851'GIT_CEILING_DIRECTORIES'::
 852        This should be a colon-separated list of absolute paths.  If
 853        set, it is a list of directories that Git should not chdir up
 854        into while looking for a repository directory (useful for
 855        excluding slow-loading network directories).  It will not
 856        exclude the current working directory or a GIT_DIR set on the
 857        command line or in the environment.  Normally, Git has to read
 858        the entries in this list and resolve any symlink that
 859        might be present in order to compare them with the current
 860        directory.  However, if even this access is slow, you
 861        can add an empty entry to the list to tell Git that the
 862        subsequent entries are not symlinks and needn't be resolved;
 863        e.g.,
 864        'GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink'.
 865
 866'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
 867        When run in a directory that does not have ".git" repository
 868        directory, Git tries to find such a directory in the parent
 869        directories to find the top of the working tree, but by default it
 870        does not cross filesystem boundaries.  This environment variable
 871        can be set to true to tell Git not to stop at filesystem
 872        boundaries.  Like 'GIT_CEILING_DIRECTORIES', this will not affect
 873        an explicit repository directory set via 'GIT_DIR' or on the
 874        command line.
 875
 876'GIT_COMMON_DIR'::
 877        If this variable is set to a path, non-worktree files that are
 878        normally in $GIT_DIR will be taken from this path
 879        instead. Worktree-specific files such as HEAD or index are
 880        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 881        linkgit:git-worktree[1] for
 882        details. This variable has lower precedence than other path
 883        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 884
 885Git Commits
 886~~~~~~~~~~~
 887'GIT_AUTHOR_NAME'::
 888'GIT_AUTHOR_EMAIL'::
 889'GIT_AUTHOR_DATE'::
 890'GIT_COMMITTER_NAME'::
 891'GIT_COMMITTER_EMAIL'::
 892'GIT_COMMITTER_DATE'::
 893'EMAIL'::
 894        see linkgit:git-commit-tree[1]
 895
 896Git Diffs
 897~~~~~~~~~
 898'GIT_DIFF_OPTS'::
 899        Only valid setting is "--unified=??" or "-u??" to set the
 900        number of context lines shown when a unified diff is created.
 901        This takes precedence over any "-U" or "--unified" option
 902        value passed on the Git diff command line.
 903
 904'GIT_EXTERNAL_DIFF'::
 905        When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
 906        program named by it is called, instead of the diff invocation
 907        described above.  For a path that is added, removed, or modified,
 908        'GIT_EXTERNAL_DIFF' is called with 7 parameters:
 909
 910        path old-file old-hex old-mode new-file new-hex new-mode
 911+
 912where:
 913
 914        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 915                         contents of <old|new>,
 916        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 917        <old|new>-mode:: are the octal representation of the file modes.
 918+
 919The file parameters can point at the user's working file
 920(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 921when a new file is added), or a temporary file (e.g. `old-file` in the
 922index).  'GIT_EXTERNAL_DIFF' should not worry about unlinking the
 923temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 924+
 925For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 926parameter, <path>.
 927+
 928For each path 'GIT_EXTERNAL_DIFF' is called, two environment variables,
 929'GIT_DIFF_PATH_COUNTER' and 'GIT_DIFF_PATH_TOTAL' are set.
 930
 931'GIT_DIFF_PATH_COUNTER'::
 932        A 1-based counter incremented by one for every path.
 933
 934'GIT_DIFF_PATH_TOTAL'::
 935        The total number of paths.
 936
 937other
 938~~~~~
 939'GIT_MERGE_VERBOSITY'::
 940        A number controlling the amount of output shown by
 941        the recursive merge strategy.  Overrides merge.verbosity.
 942        See linkgit:git-merge[1]
 943
 944'GIT_PAGER'::
 945        This environment variable overrides `$PAGER`. If it is set
 946        to an empty string or to the value "cat", Git will not launch
 947        a pager.  See also the `core.pager` option in
 948        linkgit:git-config[1].
 949
 950'GIT_EDITOR'::
 951        This environment variable overrides `$EDITOR` and `$VISUAL`.
 952        It is used by several Git commands when, on interactive mode,
 953        an editor is to be launched. See also linkgit:git-var[1]
 954        and the `core.editor` option in linkgit:git-config[1].
 955
 956'GIT_SSH'::
 957'GIT_SSH_COMMAND'::
 958        If either of these environment variables is set then 'git fetch'
 959        and 'git push' will use the specified command instead of 'ssh'
 960        when they need to connect to a remote system.
 961        The command will be given exactly two or four arguments: the
 962        'username@host' (or just 'host') from the URL and the shell
 963        command to execute on that remote system, optionally preceded by
 964        '-p' (literally) and the 'port' from the URL when it specifies
 965        something other than the default SSH port.
 966+
 967`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 968by the shell, which allows additional arguments to be included.
 969`$GIT_SSH` on the other hand must be just the path to a program
 970(which can be a wrapper shell script, if additional arguments are
 971needed).
 972+
 973Usually it is easier to configure any desired options through your
 974personal `.ssh/config` file.  Please consult your ssh documentation
 975for further details.
 976
 977'GIT_ASKPASS'::
 978        If this environment variable is set, then Git commands which need to
 979        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
 980        will call this program with a suitable prompt as command-line argument
 981        and read the password from its STDOUT. See also the 'core.askPass'
 982        option in linkgit:git-config[1].
 983
 984'GIT_TERMINAL_PROMPT'::
 985        If this environment variable is set to `0`, git will not prompt
 986        on the terminal (e.g., when asking for HTTP authentication).
 987
 988'GIT_CONFIG_NOSYSTEM'::
 989        Whether to skip reading settings from the system-wide
 990        `$(prefix)/etc/gitconfig` file.  This environment variable can
 991        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
 992        predictable environment for a picky script, or you can set it
 993        temporarily to avoid using a buggy `/etc/gitconfig` file while
 994        waiting for someone with sufficient permissions to fix it.
 995
 996'GIT_FLUSH'::
 997        If this environment variable is set to "1", then commands such
 998        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
 999        'git check-attr' and 'git check-ignore' will
1000        force a flush of the output stream after each record have been
1001        flushed. If this
1002        variable is set to "0", the output of these commands will be done
1003        using completely buffered I/O.   If this environment variable is
1004        not set, Git will choose buffered or record-oriented flushing
1005        based on whether stdout appears to be redirected to a file or not.
1006
1007'GIT_TRACE'::
1008        Enables general trace messages, e.g. alias expansion, built-in
1009        command execution and external command execution.
1010+
1011If this variable is set to "1", "2" or "true" (comparison
1012is case insensitive), trace messages will be printed to
1013stderr.
1014+
1015If the variable is set to an integer value greater than 2
1016and lower than 10 (strictly) then Git will interpret this
1017value as an open file descriptor and will try to write the
1018trace messages into this file descriptor.
1019+
1020Alternatively, if the variable is set to an absolute path
1021(starting with a '/' character), Git will interpret this
1022as a file path and will try to write the trace messages
1023into it.
1024+
1025Unsetting the variable, or setting it to empty, "0" or
1026"false" (case insensitive) disables trace messages.
1027
1028'GIT_TRACE_PACK_ACCESS'::
1029        Enables trace messages for all accesses to any packs. For each
1030        access, the pack file name and an offset in the pack is
1031        recorded. This may be helpful for troubleshooting some
1032        pack-related performance problems.
1033        See 'GIT_TRACE' for available trace output options.
1034
1035'GIT_TRACE_PACKET'::
1036        Enables trace messages for all packets coming in or out of a
1037        given program. This can help with debugging object negotiation
1038        or other protocol issues. Tracing is turned off at a packet
1039        starting with "PACK" (but see 'GIT_TRACE_PACKFILE' below).
1040        See 'GIT_TRACE' for available trace output options.
1041
1042'GIT_TRACE_PACKFILE'::
1043        Enables tracing of packfiles sent or received by a
1044        given program. Unlike other trace output, this trace is
1045        verbatim: no headers, and no quoting of binary data. You almost
1046        certainly want to direct into a file (e.g.,
1047        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1048        the terminal or mixing it with other trace output.
1049+
1050Note that this is currently only implemented for the client side
1051of clones and fetches.
1052
1053'GIT_TRACE_PERFORMANCE'::
1054        Enables performance related trace messages, e.g. total execution
1055        time of each Git command.
1056        See 'GIT_TRACE' for available trace output options.
1057
1058'GIT_TRACE_SETUP'::
1059        Enables trace messages printing the .git, working tree and current
1060        working directory after Git has completed its setup phase.
1061        See 'GIT_TRACE' for available trace output options.
1062
1063'GIT_TRACE_SHALLOW'::
1064        Enables trace messages that can help debugging fetching /
1065        cloning of shallow repositories.
1066        See 'GIT_TRACE' for available trace output options.
1067
1068'GIT_LITERAL_PATHSPECS'::
1069        Setting this variable to `1` will cause Git to treat all
1070        pathspecs literally, rather than as glob patterns. For example,
1071        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1072        for commits that touch the path `*.c`, not any paths that the
1073        glob `*.c` matches. You might want this if you are feeding
1074        literal paths to Git (e.g., paths previously given to you by
1075        `git ls-tree`, `--raw` diff output, etc).
1076
1077'GIT_GLOB_PATHSPECS'::
1078        Setting this variable to `1` will cause Git to treat all
1079        pathspecs as glob patterns (aka "glob" magic).
1080
1081'GIT_NOGLOB_PATHSPECS'::
1082        Setting this variable to `1` will cause Git to treat all
1083        pathspecs as literal (aka "literal" magic).
1084
1085'GIT_ICASE_PATHSPECS'::
1086        Setting this variable to `1` will cause Git to treat all
1087        pathspecs as case-insensitive.
1088
1089'GIT_REFLOG_ACTION'::
1090        When a ref is updated, reflog entries are created to keep
1091        track of the reason why the ref was updated (which is
1092        typically the name of the high-level command that updated
1093        the ref), in addition to the old and new values of the ref.
1094        A scripted Porcelain command can use set_reflog_action
1095        helper function in `git-sh-setup` to set its name to this
1096        variable when it is invoked as the top level command by the
1097        end user, to be recorded in the body of the reflog.
1098
1099'GIT_REF_PARANOIA'::
1100        If set to `1`, include broken or badly named refs when iterating
1101        over lists of refs. In a normal, non-corrupted repository, this
1102        does nothing. However, enabling it may help git to detect and
1103        abort some operations in the presence of broken refs. Git sets
1104        this variable automatically when performing destructive
1105        operations like linkgit:git-prune[1]. You should not need to set
1106        it yourself unless you want to be paranoid about making sure
1107        an operation has touched every ref (e.g., because you are
1108        cloning a repository to make a backup).
1109
1110'GIT_ALLOW_PROTOCOL'::
1111        If set, provide a colon-separated list of protocols which are
1112        allowed to be used with fetch/push/clone. This is useful to
1113        restrict recursive submodule initialization from an untrusted
1114        repository. Any protocol not mentioned will be disallowed (i.e.,
1115        this is a whitelist, not a blacklist). If the variable is not
1116        set at all, all protocols are enabled.  The protocol names
1117        currently used by git are:
1118
1119          - `file`: any local file-based path (including `file://` URLs,
1120            or local paths)
1121
1122          - `git`: the anonymous git protocol over a direct TCP
1123            connection (or proxy, if configured)
1124
1125          - `ssh`: git over ssh (including `host:path` syntax,
1126            `git+ssh://`, etc).
1127
1128          - `rsync`: git over rsync
1129
1130          - `http`: git over http, both "smart http" and "dumb http".
1131            Note that this does _not_ include `https`; if you want both,
1132            you should specify both as `http:https`.
1133
1134          - any external helpers are named by their protocol (e.g., use
1135            `hg` to allow the `git-remote-hg` helper)
1136
1137
1138Discussion[[Discussion]]
1139------------------------
1140
1141More detail on the following is available from the
1142link:user-manual.html#git-concepts[Git concepts chapter of the
1143user-manual] and linkgit:gitcore-tutorial[7].
1144
1145A Git project normally consists of a working directory with a ".git"
1146subdirectory at the top level.  The .git directory contains, among other
1147things, a compressed object database representing the complete history
1148of the project, an "index" file which links that history to the current
1149contents of the working tree, and named pointers into that history such
1150as tags and branch heads.
1151
1152The object database contains objects of three main types: blobs, which
1153hold file data; trees, which point to blobs and other trees to build up
1154directory hierarchies; and commits, which each reference a single tree
1155and some number of parent commits.
1156
1157The commit, equivalent to what other systems call a "changeset" or
1158"version", represents a step in the project's history, and each parent
1159represents an immediately preceding step.  Commits with more than one
1160parent represent merges of independent lines of development.
1161
1162All objects are named by the SHA-1 hash of their contents, normally
1163written as a string of 40 hex digits.  Such names are globally unique.
1164The entire history leading up to a commit can be vouched for by signing
1165just that commit.  A fourth object type, the tag, is provided for this
1166purpose.
1167
1168When first created, objects are stored in individual files, but for
1169efficiency may later be compressed together into "pack files".
1170
1171Named pointers called refs mark interesting points in history.  A ref
1172may contain the SHA-1 name of an object or the name of another ref.  Refs
1173with names beginning `ref/head/` contain the SHA-1 name of the most
1174recent commit (or "head") of a branch under development.  SHA-1 names of
1175tags of interest are stored under `ref/tags/`.  A special ref named
1176`HEAD` contains the name of the currently checked-out branch.
1177
1178The index file is initialized with a list of all paths and, for each
1179path, a blob object and a set of attributes.  The blob object represents
1180the contents of the file as of the head of the current branch.  The
1181attributes (last modified time, size, etc.) are taken from the
1182corresponding file in the working tree.  Subsequent changes to the
1183working tree can be found by comparing these attributes.  The index may
1184be updated with new content, and new commits may be created from the
1185content stored in the index.
1186
1187The index is also capable of storing multiple entries (called "stages")
1188for a given pathname.  These stages are used to hold the various
1189unmerged version of a file when a merge is in progress.
1190
1191FURTHER DOCUMENTATION
1192---------------------
1193
1194See the references in the "description" section to get started
1195using Git.  The following is probably more detail than necessary
1196for a first-time user.
1197
1198The link:user-manual.html#git-concepts[Git concepts chapter of the
1199user-manual] and linkgit:gitcore-tutorial[7] both provide
1200introductions to the underlying Git architecture.
1201
1202See linkgit:gitworkflows[7] for an overview of recommended workflows.
1203
1204See also the link:howto-index.html[howto] documents for some useful
1205examples.
1206
1207The internals are documented in the
1208link:technical/api-index.html[Git API documentation].
1209
1210Users migrating from CVS may also want to
1211read linkgit:gitcvs-migration[7].
1212
1213
1214Authors
1215-------
1216Git was started by Linus Torvalds, and is currently maintained by Junio
1217C Hamano. Numerous contributions have come from the Git mailing list
1218<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1219gives you a more complete list of contributors.
1220
1221If you have a clone of git.git itself, the
1222output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1223the authors for specific parts of the project.
1224
1225Reporting Bugs
1226--------------
1227
1228Report bugs to the Git mailing list <git@vger.kernel.org> where the
1229development and maintenance is primarily done.  You do not have to be
1230subscribed to the list to send a message there.
1231
1232SEE ALSO
1233--------
1234linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1235linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1236linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1237linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1238linkgit:gitworkflows[7]
1239
1240GIT
1241---
1242Part of the linkgit:git[1] suite