Documentation / git.txton commit Merge branch 'mg/wt-status-mismarked-i18n' (db6696f)
   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:v2.7.3/git.html[documentation for release 2.7.3]
  47
  48* release notes for
  49  link:RelNotes/2.7.3.txt[2.7.3],
  50  link:RelNotes/2.7.2.txt[2.7.2],
  51  link:RelNotes/2.7.1.txt[2.7.1],
  52  link:RelNotes/2.7.0.txt[2.7].
  53
  54* link:v2.6.5/git.html[documentation for release 2.6.5]
  55
  56* release notes for
  57  link:RelNotes/2.6.5.txt[2.6.5],
  58  link:RelNotes/2.6.4.txt[2.6.4],
  59  link:RelNotes/2.6.3.txt[2.6.3],
  60  link:RelNotes/2.6.2.txt[2.6.2],
  61  link:RelNotes/2.6.1.txt[2.6.1],
  62  link:RelNotes/2.6.0.txt[2.6].
  63
  64* link:v2.5.4/git.html[documentation for release 2.5.4]
  65
  66* release notes for
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  68  link:RelNotes/2.5.3.txt[2.5.3],
  69  link:RelNotes/2.5.2.txt[2.5.2],
  70  link:RelNotes/2.5.1.txt[2.5.1],
  71  link:RelNotes/2.5.0.txt[2.5].
  72
  73* link:v2.4.10/git.html[documentation for release 2.4.10]
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  82  link:RelNotes/2.4.4.txt[2.4.4],
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  84  link:RelNotes/2.4.2.txt[2.4.2],
  85  link:RelNotes/2.4.1.txt[2.4.1],
  86  link:RelNotes/2.4.0.txt[2.4].
  87
  88* link:v2.3.10/git.html[documentation for release 2.3.10]
  89
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 427
 428* release notes for
 429  link:RelNotes/1.5.4.7.txt[1.5.4.7],
 430  link:RelNotes/1.5.4.6.txt[1.5.4.6],
 431  link:RelNotes/1.5.4.5.txt[1.5.4.5],
 432  link:RelNotes/1.5.4.4.txt[1.5.4.4],
 433  link:RelNotes/1.5.4.3.txt[1.5.4.3],
 434  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 435  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 436  link:RelNotes/1.5.4.txt[1.5.4].
 437
 438* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 439
 440* release notes for
 441  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 442  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 443  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 444  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 445  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 446  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 447  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 448  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 449  link:RelNotes/1.5.3.txt[1.5.3].
 450
 451* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 452
 453* release notes for
 454  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 455  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 456  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 457  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 458  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 459  link:RelNotes/1.5.2.txt[1.5.2].
 460
 461* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 462
 463* release notes for
 464  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 465  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 466  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 467  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 468  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 469  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 470  link:RelNotes/1.5.1.txt[1.5.1].
 471
 472* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 473
 474* release notes for
 475  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 476  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 477  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 478  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 479  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 480  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 481  link:RelNotes/1.5.0.txt[1.5.0].
 482
 483* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 484  link:v1.3.3/git.html[1.3.3],
 485  link:v1.2.6/git.html[1.2.6],
 486  link:v1.0.13/git.html[1.0.13].
 487
 488============
 489
 490endif::stalenotes[]
 491
 492OPTIONS
 493-------
 494--version::
 495        Prints the Git suite version that the 'git' program came from.
 496
 497--help::
 498        Prints the synopsis and a list of the most commonly used
 499        commands. If the option '--all' or '-a' is given then all
 500        available commands are printed. If a Git command is named this
 501        option will bring up the manual page for that command.
 502+
 503Other options are available to control how the manual page is
 504displayed. See linkgit:git-help[1] for more information,
 505because `git --help ...` is converted internally into `git
 506help ...`.
 507
 508-C <path>::
 509        Run as if git was started in '<path>' instead of the current working
 510        directory.  When multiple `-C` options are given, each subsequent
 511        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 512        <path>`.
 513+
 514This option affects options that expect path name like `--git-dir` and
 515`--work-tree` in that their interpretations of the path names would be
 516made relative to the working directory caused by the `-C` option. For
 517example the following invocations are equivalent:
 518
 519    git --git-dir=a.git --work-tree=b -C c status
 520    git --git-dir=c/a.git --work-tree=c/b status
 521
 522-c <name>=<value>::
 523        Pass a configuration parameter to the command. The value
 524        given will override values from configuration files.
 525        The <name> is expected in the same format as listed by
 526        'git config' (subkeys separated by dots).
 527+
 528Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 529`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 530config file). Including the equals but with an empty value (like `git -c
 531foo.bar= ...`) sets `foo.bar` to the empty string.
 532
 533--exec-path[=<path>]::
 534        Path to wherever your core Git programs are installed.
 535        This can also be controlled by setting the GIT_EXEC_PATH
 536        environment variable. If no path is given, 'git' will print
 537        the current setting and then exit.
 538
 539--html-path::
 540        Print the path, without trailing slash, where Git's HTML
 541        documentation is installed and exit.
 542
 543--man-path::
 544        Print the manpath (see `man(1)`) for the man pages for
 545        this version of Git and exit.
 546
 547--info-path::
 548        Print the path where the Info files documenting this
 549        version of Git are installed and exit.
 550
 551-p::
 552--paginate::
 553        Pipe all output into 'less' (or if set, $PAGER) if standard
 554        output is a terminal.  This overrides the `pager.<cmd>`
 555        configuration options (see the "Configuration Mechanism" section
 556        below).
 557
 558--no-pager::
 559        Do not pipe Git output into a pager.
 560
 561--git-dir=<path>::
 562        Set the path to the repository. This can also be controlled by
 563        setting the GIT_DIR environment variable. It can be an absolute
 564        path or relative path to current working directory.
 565
 566--work-tree=<path>::
 567        Set the path to the working tree. It can be an absolute path
 568        or a path relative to the current working directory.
 569        This can also be controlled by setting the GIT_WORK_TREE
 570        environment variable and the core.worktree configuration
 571        variable (see core.worktree in linkgit:git-config[1] for a
 572        more detailed discussion).
 573
 574--namespace=<path>::
 575        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 576        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 577        variable.
 578
 579--bare::
 580        Treat the repository as a bare repository.  If GIT_DIR
 581        environment is not set, it is set to the current working
 582        directory.
 583
 584--no-replace-objects::
 585        Do not use replacement refs to replace Git objects. See
 586        linkgit:git-replace[1] for more information.
 587
 588--literal-pathspecs::
 589        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 590        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 591        variable to `1`.
 592
 593--glob-pathspecs::
 594        Add "glob" magic to all pathspec. This is equivalent to setting
 595        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 596        globbing on individual pathspecs can be done using pathspec
 597        magic ":(literal)"
 598
 599--noglob-pathspecs::
 600        Add "literal" magic to all pathspec. This is equivalent to setting
 601        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 602        globbing on individual pathspecs can be done using pathspec
 603        magic ":(glob)"
 604
 605--icase-pathspecs::
 606        Add "icase" magic to all pathspec. This is equivalent to setting
 607        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 608
 609GIT COMMANDS
 610------------
 611
 612We divide Git into high level ("porcelain") commands and low level
 613("plumbing") commands.
 614
 615High-level commands (porcelain)
 616-------------------------------
 617
 618We separate the porcelain commands into the main commands and some
 619ancillary user utilities.
 620
 621Main porcelain commands
 622~~~~~~~~~~~~~~~~~~~~~~~
 623
 624include::cmds-mainporcelain.txt[]
 625
 626Ancillary Commands
 627~~~~~~~~~~~~~~~~~~
 628Manipulators:
 629
 630include::cmds-ancillarymanipulators.txt[]
 631
 632Interrogators:
 633
 634include::cmds-ancillaryinterrogators.txt[]
 635
 636
 637Interacting with Others
 638~~~~~~~~~~~~~~~~~~~~~~~
 639
 640These commands are to interact with foreign SCM and with other
 641people via patch over e-mail.
 642
 643include::cmds-foreignscminterface.txt[]
 644
 645
 646Low-level commands (plumbing)
 647-----------------------------
 648
 649Although Git includes its
 650own porcelain layer, its low-level commands are sufficient to support
 651development of alternative porcelains.  Developers of such porcelains
 652might start by reading about linkgit:git-update-index[1] and
 653linkgit:git-read-tree[1].
 654
 655The interface (input, output, set of options and the semantics)
 656to these low-level commands are meant to be a lot more stable
 657than Porcelain level commands, because these commands are
 658primarily for scripted use.  The interface to Porcelain commands
 659on the other hand are subject to change in order to improve the
 660end user experience.
 661
 662The following description divides
 663the low-level commands into commands that manipulate objects (in
 664the repository, index, and working tree), commands that interrogate and
 665compare objects, and commands that move objects and references between
 666repositories.
 667
 668
 669Manipulation commands
 670~~~~~~~~~~~~~~~~~~~~~
 671
 672include::cmds-plumbingmanipulators.txt[]
 673
 674
 675Interrogation commands
 676~~~~~~~~~~~~~~~~~~~~~~
 677
 678include::cmds-plumbinginterrogators.txt[]
 679
 680In general, the interrogate commands do not touch the files in
 681the working tree.
 682
 683
 684Synching repositories
 685~~~~~~~~~~~~~~~~~~~~~
 686
 687include::cmds-synchingrepositories.txt[]
 688
 689The following are helper commands used by the above; end users
 690typically do not use them directly.
 691
 692include::cmds-synchelpers.txt[]
 693
 694
 695Internal helper commands
 696~~~~~~~~~~~~~~~~~~~~~~~~
 697
 698These are internal helper commands used by other commands; end
 699users typically do not use them directly.
 700
 701include::cmds-purehelpers.txt[]
 702
 703
 704Configuration Mechanism
 705-----------------------
 706
 707Git uses a simple text format to store customizations that are per
 708repository and are per user.  Such a configuration file may look
 709like this:
 710
 711------------
 712#
 713# A '#' or ';' character indicates a comment.
 714#
 715
 716; core variables
 717[core]
 718        ; Don't trust file modes
 719        filemode = false
 720
 721; user identity
 722[user]
 723        name = "Junio C Hamano"
 724        email = "gitster@pobox.com"
 725
 726------------
 727
 728Various commands read from the configuration file and adjust
 729their operation accordingly.  See linkgit:git-config[1] for a
 730list and more details about the configuration mechanism.
 731
 732
 733Identifier Terminology
 734----------------------
 735<object>::
 736        Indicates the object name for any type of object.
 737
 738<blob>::
 739        Indicates a blob object name.
 740
 741<tree>::
 742        Indicates a tree object name.
 743
 744<commit>::
 745        Indicates a commit object name.
 746
 747<tree-ish>::
 748        Indicates a tree, commit or tag object name.  A
 749        command that takes a <tree-ish> argument ultimately wants to
 750        operate on a <tree> object but automatically dereferences
 751        <commit> and <tag> objects that point at a <tree>.
 752
 753<commit-ish>::
 754        Indicates a commit or tag object name.  A
 755        command that takes a <commit-ish> argument ultimately wants to
 756        operate on a <commit> object but automatically dereferences
 757        <tag> objects that point at a <commit>.
 758
 759<type>::
 760        Indicates that an object type is required.
 761        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 762
 763<file>::
 764        Indicates a filename - almost always relative to the
 765        root of the tree structure `GIT_INDEX_FILE` describes.
 766
 767Symbolic Identifiers
 768--------------------
 769Any Git command accepting any <object> can also use the following
 770symbolic notation:
 771
 772HEAD::
 773        indicates the head of the current branch.
 774
 775<tag>::
 776        a valid tag 'name'
 777        (i.e. a `refs/tags/<tag>` reference).
 778
 779<head>::
 780        a valid head 'name'
 781        (i.e. a `refs/heads/<head>` reference).
 782
 783For a more complete list of ways to spell object names, see
 784"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 785
 786
 787File/Directory Structure
 788------------------------
 789
 790Please see the linkgit:gitrepository-layout[5] document.
 791
 792Read linkgit:githooks[5] for more details about each hook.
 793
 794Higher level SCMs may provide and manage additional information in the
 795`$GIT_DIR`.
 796
 797
 798Terminology
 799-----------
 800Please see linkgit:gitglossary[7].
 801
 802
 803Environment Variables
 804---------------------
 805Various Git commands use the following environment variables:
 806
 807The Git Repository
 808~~~~~~~~~~~~~~~~~~
 809These environment variables apply to 'all' core Git commands. Nb: it
 810is worth noting that they may be used/overridden by SCMS sitting above
 811Git so take care if using a foreign front-end.
 812
 813'GIT_INDEX_FILE'::
 814        This environment allows the specification of an alternate
 815        index file. If not specified, the default of `$GIT_DIR/index`
 816        is used.
 817
 818'GIT_INDEX_VERSION'::
 819        This environment variable allows the specification of an index
 820        version for new repositories.  It won't affect existing index
 821        files.  By default index file version 2 or 3 is used. See
 822        linkgit:git-update-index[1] for more information.
 823
 824'GIT_OBJECT_DIRECTORY'::
 825        If the object storage directory is specified via this
 826        environment variable then the sha1 directories are created
 827        underneath - otherwise the default `$GIT_DIR/objects`
 828        directory is used.
 829
 830'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
 831        Due to the immutable nature of Git objects, old objects can be
 832        archived into shared, read-only directories. This variable
 833        specifies a ":" separated (on Windows ";" separated) list
 834        of Git object directories which can be used to search for Git
 835        objects. New objects will not be written to these directories.
 836
 837'GIT_DIR'::
 838        If the 'GIT_DIR' environment variable is set then it
 839        specifies a path to use instead of the default `.git`
 840        for the base of the repository.
 841        The '--git-dir' command-line option also sets this value.
 842
 843'GIT_WORK_TREE'::
 844        Set the path to the root of the working tree.
 845        This can also be controlled by the '--work-tree' command-line
 846        option and the core.worktree configuration variable.
 847
 848'GIT_NAMESPACE'::
 849        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 850        The '--namespace' command-line option also sets this value.
 851
 852'GIT_CEILING_DIRECTORIES'::
 853        This should be a colon-separated list of absolute paths.  If
 854        set, it is a list of directories that Git should not chdir up
 855        into while looking for a repository directory (useful for
 856        excluding slow-loading network directories).  It will not
 857        exclude the current working directory or a GIT_DIR set on the
 858        command line or in the environment.  Normally, Git has to read
 859        the entries in this list and resolve any symlink that
 860        might be present in order to compare them with the current
 861        directory.  However, if even this access is slow, you
 862        can add an empty entry to the list to tell Git that the
 863        subsequent entries are not symlinks and needn't be resolved;
 864        e.g.,
 865        'GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink'.
 866
 867'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
 868        When run in a directory that does not have ".git" repository
 869        directory, Git tries to find such a directory in the parent
 870        directories to find the top of the working tree, but by default it
 871        does not cross filesystem boundaries.  This environment variable
 872        can be set to true to tell Git not to stop at filesystem
 873        boundaries.  Like 'GIT_CEILING_DIRECTORIES', this will not affect
 874        an explicit repository directory set via 'GIT_DIR' or on the
 875        command line.
 876
 877'GIT_COMMON_DIR'::
 878        If this variable is set to a path, non-worktree files that are
 879        normally in $GIT_DIR will be taken from this path
 880        instead. Worktree-specific files such as HEAD or index are
 881        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 882        linkgit:git-worktree[1] for
 883        details. This variable has lower precedence than other path
 884        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 885
 886Git Commits
 887~~~~~~~~~~~
 888'GIT_AUTHOR_NAME'::
 889'GIT_AUTHOR_EMAIL'::
 890'GIT_AUTHOR_DATE'::
 891'GIT_COMMITTER_NAME'::
 892'GIT_COMMITTER_EMAIL'::
 893'GIT_COMMITTER_DATE'::
 894'EMAIL'::
 895        see linkgit:git-commit-tree[1]
 896
 897Git Diffs
 898~~~~~~~~~
 899'GIT_DIFF_OPTS'::
 900        Only valid setting is "--unified=??" or "-u??" to set the
 901        number of context lines shown when a unified diff is created.
 902        This takes precedence over any "-U" or "--unified" option
 903        value passed on the Git diff command line.
 904
 905'GIT_EXTERNAL_DIFF'::
 906        When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
 907        program named by it is called, instead of the diff invocation
 908        described above.  For a path that is added, removed, or modified,
 909        'GIT_EXTERNAL_DIFF' is called with 7 parameters:
 910
 911        path old-file old-hex old-mode new-file new-hex new-mode
 912+
 913where:
 914
 915        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 916                         contents of <old|new>,
 917        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 918        <old|new>-mode:: are the octal representation of the file modes.
 919+
 920The file parameters can point at the user's working file
 921(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 922when a new file is added), or a temporary file (e.g. `old-file` in the
 923index).  'GIT_EXTERNAL_DIFF' should not worry about unlinking the
 924temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 925+
 926For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 927parameter, <path>.
 928+
 929For each path 'GIT_EXTERNAL_DIFF' is called, two environment variables,
 930'GIT_DIFF_PATH_COUNTER' and 'GIT_DIFF_PATH_TOTAL' are set.
 931
 932'GIT_DIFF_PATH_COUNTER'::
 933        A 1-based counter incremented by one for every path.
 934
 935'GIT_DIFF_PATH_TOTAL'::
 936        The total number of paths.
 937
 938other
 939~~~~~
 940'GIT_MERGE_VERBOSITY'::
 941        A number controlling the amount of output shown by
 942        the recursive merge strategy.  Overrides merge.verbosity.
 943        See linkgit:git-merge[1]
 944
 945'GIT_PAGER'::
 946        This environment variable overrides `$PAGER`. If it is set
 947        to an empty string or to the value "cat", Git will not launch
 948        a pager.  See also the `core.pager` option in
 949        linkgit:git-config[1].
 950
 951'GIT_EDITOR'::
 952        This environment variable overrides `$EDITOR` and `$VISUAL`.
 953        It is used by several Git commands when, on interactive mode,
 954        an editor is to be launched. See also linkgit:git-var[1]
 955        and the `core.editor` option in linkgit:git-config[1].
 956
 957'GIT_SSH'::
 958'GIT_SSH_COMMAND'::
 959        If either of these environment variables is set then 'git fetch'
 960        and 'git push' will use the specified command instead of 'ssh'
 961        when they need to connect to a remote system.
 962        The command will be given exactly two or four arguments: the
 963        'username@host' (or just 'host') from the URL and the shell
 964        command to execute on that remote system, optionally preceded by
 965        '-p' (literally) and the 'port' from the URL when it specifies
 966        something other than the default SSH port.
 967+
 968`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 969by the shell, which allows additional arguments to be included.
 970`$GIT_SSH` on the other hand must be just the path to a program
 971(which can be a wrapper shell script, if additional arguments are
 972needed).
 973+
 974Usually it is easier to configure any desired options through your
 975personal `.ssh/config` file.  Please consult your ssh documentation
 976for further details.
 977
 978'GIT_ASKPASS'::
 979        If this environment variable is set, then Git commands which need to
 980        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
 981        will call this program with a suitable prompt as command-line argument
 982        and read the password from its STDOUT. See also the 'core.askPass'
 983        option in linkgit:git-config[1].
 984
 985'GIT_TERMINAL_PROMPT'::
 986        If this environment variable is set to `0`, git will not prompt
 987        on the terminal (e.g., when asking for HTTP authentication).
 988
 989'GIT_CONFIG_NOSYSTEM'::
 990        Whether to skip reading settings from the system-wide
 991        `$(prefix)/etc/gitconfig` file.  This environment variable can
 992        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
 993        predictable environment for a picky script, or you can set it
 994        temporarily to avoid using a buggy `/etc/gitconfig` file while
 995        waiting for someone with sufficient permissions to fix it.
 996
 997'GIT_FLUSH'::
 998        If this environment variable is set to "1", then commands such
 999        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
1000        'git check-attr' and 'git check-ignore' will
1001        force a flush of the output stream after each record have been
1002        flushed. If this
1003        variable is set to "0", the output of these commands will be done
1004        using completely buffered I/O.   If this environment variable is
1005        not set, Git will choose buffered or record-oriented flushing
1006        based on whether stdout appears to be redirected to a file or not.
1007
1008'GIT_TRACE'::
1009        Enables general trace messages, e.g. alias expansion, built-in
1010        command execution and external command execution.
1011+
1012If this variable is set to "1", "2" or "true" (comparison
1013is case insensitive), trace messages will be printed to
1014stderr.
1015+
1016If the variable is set to an integer value greater than 2
1017and lower than 10 (strictly) then Git will interpret this
1018value as an open file descriptor and will try to write the
1019trace messages into this file descriptor.
1020+
1021Alternatively, if the variable is set to an absolute path
1022(starting with a '/' character), Git will interpret this
1023as a file path and will try to write the trace messages
1024into it.
1025+
1026Unsetting the variable, or setting it to empty, "0" or
1027"false" (case insensitive) disables trace messages.
1028
1029'GIT_TRACE_PACK_ACCESS'::
1030        Enables trace messages for all accesses to any packs. For each
1031        access, the pack file name and an offset in the pack is
1032        recorded. This may be helpful for troubleshooting some
1033        pack-related performance problems.
1034        See 'GIT_TRACE' for available trace output options.
1035
1036'GIT_TRACE_PACKET'::
1037        Enables trace messages for all packets coming in or out of a
1038        given program. This can help with debugging object negotiation
1039        or other protocol issues. Tracing is turned off at a packet
1040        starting with "PACK" (but see 'GIT_TRACE_PACKFILE' below).
1041        See 'GIT_TRACE' for available trace output options.
1042
1043'GIT_TRACE_PACKFILE'::
1044        Enables tracing of packfiles sent or received by a
1045        given program. Unlike other trace output, this trace is
1046        verbatim: no headers, and no quoting of binary data. You almost
1047        certainly want to direct into a file (e.g.,
1048        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1049        the terminal or mixing it with other trace output.
1050+
1051Note that this is currently only implemented for the client side
1052of clones and fetches.
1053
1054'GIT_TRACE_PERFORMANCE'::
1055        Enables performance related trace messages, e.g. total execution
1056        time of each Git command.
1057        See 'GIT_TRACE' for available trace output options.
1058
1059'GIT_TRACE_SETUP'::
1060        Enables trace messages printing the .git, working tree and current
1061        working directory after Git has completed its setup phase.
1062        See 'GIT_TRACE' for available trace output options.
1063
1064'GIT_TRACE_SHALLOW'::
1065        Enables trace messages that can help debugging fetching /
1066        cloning of shallow repositories.
1067        See 'GIT_TRACE' for available trace output options.
1068
1069'GIT_TRACE_EXCLUDE'::
1070        Enables trace messages that can help debugging .gitignore
1071        processing. See 'GIT_TRACE' for available trace output
1072        options.
1073
1074'GIT_LITERAL_PATHSPECS'::
1075        Setting this variable to `1` will cause Git to treat all
1076        pathspecs literally, rather than as glob patterns. For example,
1077        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1078        for commits that touch the path `*.c`, not any paths that the
1079        glob `*.c` matches. You might want this if you are feeding
1080        literal paths to Git (e.g., paths previously given to you by
1081        `git ls-tree`, `--raw` diff output, etc).
1082
1083'GIT_GLOB_PATHSPECS'::
1084        Setting this variable to `1` will cause Git to treat all
1085        pathspecs as glob patterns (aka "glob" magic).
1086
1087'GIT_NOGLOB_PATHSPECS'::
1088        Setting this variable to `1` will cause Git to treat all
1089        pathspecs as literal (aka "literal" magic).
1090
1091'GIT_ICASE_PATHSPECS'::
1092        Setting this variable to `1` will cause Git to treat all
1093        pathspecs as case-insensitive.
1094
1095'GIT_REFLOG_ACTION'::
1096        When a ref is updated, reflog entries are created to keep
1097        track of the reason why the ref was updated (which is
1098        typically the name of the high-level command that updated
1099        the ref), in addition to the old and new values of the ref.
1100        A scripted Porcelain command can use set_reflog_action
1101        helper function in `git-sh-setup` to set its name to this
1102        variable when it is invoked as the top level command by the
1103        end user, to be recorded in the body of the reflog.
1104
1105'GIT_REF_PARANOIA'::
1106        If set to `1`, include broken or badly named refs when iterating
1107        over lists of refs. In a normal, non-corrupted repository, this
1108        does nothing. However, enabling it may help git to detect and
1109        abort some operations in the presence of broken refs. Git sets
1110        this variable automatically when performing destructive
1111        operations like linkgit:git-prune[1]. You should not need to set
1112        it yourself unless you want to be paranoid about making sure
1113        an operation has touched every ref (e.g., because you are
1114        cloning a repository to make a backup).
1115
1116'GIT_ALLOW_PROTOCOL'::
1117        If set, provide a colon-separated list of protocols which are
1118        allowed to be used with fetch/push/clone. This is useful to
1119        restrict recursive submodule initialization from an untrusted
1120        repository. Any protocol not mentioned will be disallowed (i.e.,
1121        this is a whitelist, not a blacklist). If the variable is not
1122        set at all, all protocols are enabled.  The protocol names
1123        currently used by git are:
1124
1125          - `file`: any local file-based path (including `file://` URLs,
1126            or local paths)
1127
1128          - `git`: the anonymous git protocol over a direct TCP
1129            connection (or proxy, if configured)
1130
1131          - `ssh`: git over ssh (including `host:path` syntax,
1132            `git+ssh://`, etc).
1133
1134          - `http`: git over http, both "smart http" and "dumb http".
1135            Note that this does _not_ include `https`; if you want both,
1136            you should specify both as `http:https`.
1137
1138          - any external helpers are named by their protocol (e.g., use
1139            `hg` to allow the `git-remote-hg` helper)
1140
1141
1142Discussion[[Discussion]]
1143------------------------
1144
1145More detail on the following is available from the
1146link:user-manual.html#git-concepts[Git concepts chapter of the
1147user-manual] and linkgit:gitcore-tutorial[7].
1148
1149A Git project normally consists of a working directory with a ".git"
1150subdirectory at the top level.  The .git directory contains, among other
1151things, a compressed object database representing the complete history
1152of the project, an "index" file which links that history to the current
1153contents of the working tree, and named pointers into that history such
1154as tags and branch heads.
1155
1156The object database contains objects of three main types: blobs, which
1157hold file data; trees, which point to blobs and other trees to build up
1158directory hierarchies; and commits, which each reference a single tree
1159and some number of parent commits.
1160
1161The commit, equivalent to what other systems call a "changeset" or
1162"version", represents a step in the project's history, and each parent
1163represents an immediately preceding step.  Commits with more than one
1164parent represent merges of independent lines of development.
1165
1166All objects are named by the SHA-1 hash of their contents, normally
1167written as a string of 40 hex digits.  Such names are globally unique.
1168The entire history leading up to a commit can be vouched for by signing
1169just that commit.  A fourth object type, the tag, is provided for this
1170purpose.
1171
1172When first created, objects are stored in individual files, but for
1173efficiency may later be compressed together into "pack files".
1174
1175Named pointers called refs mark interesting points in history.  A ref
1176may contain the SHA-1 name of an object or the name of another ref.  Refs
1177with names beginning `ref/head/` contain the SHA-1 name of the most
1178recent commit (or "head") of a branch under development.  SHA-1 names of
1179tags of interest are stored under `ref/tags/`.  A special ref named
1180`HEAD` contains the name of the currently checked-out branch.
1181
1182The index file is initialized with a list of all paths and, for each
1183path, a blob object and a set of attributes.  The blob object represents
1184the contents of the file as of the head of the current branch.  The
1185attributes (last modified time, size, etc.) are taken from the
1186corresponding file in the working tree.  Subsequent changes to the
1187working tree can be found by comparing these attributes.  The index may
1188be updated with new content, and new commits may be created from the
1189content stored in the index.
1190
1191The index is also capable of storing multiple entries (called "stages")
1192for a given pathname.  These stages are used to hold the various
1193unmerged version of a file when a merge is in progress.
1194
1195FURTHER DOCUMENTATION
1196---------------------
1197
1198See the references in the "description" section to get started
1199using Git.  The following is probably more detail than necessary
1200for a first-time user.
1201
1202The link:user-manual.html#git-concepts[Git concepts chapter of the
1203user-manual] and linkgit:gitcore-tutorial[7] both provide
1204introductions to the underlying Git architecture.
1205
1206See linkgit:gitworkflows[7] for an overview of recommended workflows.
1207
1208See also the link:howto-index.html[howto] documents for some useful
1209examples.
1210
1211The internals are documented in the
1212link:technical/api-index.html[Git API documentation].
1213
1214Users migrating from CVS may also want to
1215read linkgit:gitcvs-migration[7].
1216
1217
1218Authors
1219-------
1220Git was started by Linus Torvalds, and is currently maintained by Junio
1221C Hamano. Numerous contributions have come from the Git mailing list
1222<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1223gives you a more complete list of contributors.
1224
1225If you have a clone of git.git itself, the
1226output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1227the authors for specific parts of the project.
1228
1229Reporting Bugs
1230--------------
1231
1232Report bugs to the Git mailing list <git@vger.kernel.org> where the
1233development and maintenance is primarily done.  You do not have to be
1234subscribed to the list to send a message there.
1235
1236SEE ALSO
1237--------
1238linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1239linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1240linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1241linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1242linkgit:gitworkflows[7]
1243
1244GIT
1245---
1246Part of the linkgit:git[1] suite